LD A high PSRR ultra low drop linear regulator with reverse current protection. Datasheet. Features. Applications.

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1 Datasheet 2 A high PSRR ultra low drop linear regulator with reverse current protection Features Input voltage from 1.25 V to 6. V Ultra low drop: 13 mv (typ.) at 2 A load 1 % output accuracy at 25 C, 2 % in full temperature range High PSRR: 7 db at 1 khz Reverse current protection 2 A guaranteed output current Available in fixed and adjustable output voltage version from.5 V with 1 mv step Power Good Internal current and thermal limit Operating junction temperature range: -4 C to 125 C DFN6 (3 x 3 mm) and DFN8 (4 x 4 mm) packages Applications Telecom infrastructure Medium power POL Description Maturity status link LD392 The LD392 provides 2 A of maximum current with an input voltage range from 1.25 V to 6. V, and a typical dropout voltage of 13 mv. It is stable with ceramic capacitors on the output (1 µf). Typical power supply rejection ratio is 7 db at 1 khz and starts to roll off at 2 khz. The enable logic control function puts the LD392 in shutdown mode, reducing the total current consumption to 1 na (typ.). Power Good flag is available on a dedicated pin. The device also includes reverse current protection, short-circuit constant current limit and thermal protection. Typical applications are for Telecom infrastructure and consumer. DS179 - Rev 3 - September 218 For further information contact your local STMicroelectronics sales office.

2 Block diagram 1 Block diagram Figure 1. Block diagram VIN Power good VREF VFB PG Bandgap reference R1 RC filter 5mV R2 5mV VFB OPAMP PMOS Reverse current protection VOUT R3 EN Enable Internal enable R4 AM1397V1 DS179 - Rev 3 page 2/29

3 Pin configuration and description 2 Pin configuration and description Figure 2. Pin configuration (top view) OUT ADJ/SENSE GND IN EN PG OUT OUT ADJ/SENSE GND IN IN EN PG AM1399V1 Table 1. DFN6 (3 x 3 mm) package pin description Pin name Pin number Description IN 6 Input voltage GND 3 Ground EN 5 Enable pin. The device is in OFF state when this pin is pulled low ADJ/sense (1) 2 Adjustable pin on ADJ version can be connected to external resistor divider to set the output voltage. Output sense pin on the fixed version has to be connected to V OUT OUT 1 Output voltage PG 4 Power Good GND Exposed pad Exposed pad should be connected to GND 1. The output sense pin of the fixed version has to be connected to the output pin for proper operation. Table 2. DFN8 (4 x 4 mm) package pin description Pin name Pin number Description IN (1) 7, 8 Input voltage GND 4 Ground EN 6 Enable pin. The device is in OFF state when this pin is pulled low ADJ/sense (2) 3 Adjustable pin on ADJ version can be connected to external resistor divider to set the output voltage. Output sense pin on the fixed version has to be connected to V OUT OUT (3) 1, 2 Output voltage PG 5 Power Good GND Exposed pad Exposed pad should be connected to GND 1. Both of input pins have to be connected together on the board. 2. The output sense pin of the fixed version has to be connected to the OUT pin for proper operation. 3. Both of output pins have to be connected together on the board. DS179 - Rev 3 page 3/29

4 Typical application 3 Typical application Figure 3. LD392 typical application schematic IN OUT IN OUT C IN LD392 C OUT R1 C BYP (optional) C IN LD392 C OUT EN ADJ EN SENSE ON GND PG R2 ON GND PG OFF OFF Adjustable version Fixed version AM1399V1 Note: R1 and R2 are calculated according to the following formula: R1 = R2 x (V OUT / V ADJ - 1). Recommended value for C IN and C OUT is 1 μf. DS179 - Rev 3 page 4/29

5 Maximum ratings 4 Maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit V IN Input supply voltage -.3 to 7 V V ADJ Adjustable voltage -.3 to 2 V V OUT /V SENSE Output voltage/output sense voltage -.3 to 7 V I OUT Output current Internally limited A EN Enable pin voltage -.3 to 7 V PG Power Good pin voltage -.3 to 7 V P D Power dissipation Internally limited W ESD Charge device model ±5 Human body model ±2 V T J-OP Operating junction temperature -4 to 125 C T J-MAX Maximum junction temperature 15 C T STG Storage temperature -55 to 15 C Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Table 4. Thermal data Symbol Parameter DFN6 (3 x 3 mm) DFN8 (4 x 4 mm) Unit R THJC Junction-to-case thermal resistance 1 4 R THJA Junction-to- ambient thermal resistance 55 4 C/W DS179 - Rev 3 page 5/29

6 Electrical characteristics 5 Electrical characteristics (T J = 25 C, V IN = V OUT +1 V; V OUT = V ADJ ; C IN = 1 µf; C OUT = 1 µf; I OUT = 1 ma; V EN = V IN ) Table 5. Electrical characteristics, adjustable version Symbol Parameter Test conditions Min. Typ. Max. Unit V IN Operating input voltage range V Adjustable pin voltage.5 V V ADJ Adjustable pin voltage accuracy T J = 25 C C < T J < 125 C % I ADJ Adjustable pin current -4 C < T J < 125 C 1 na V ADJ %/ VIN Static line regulation V OUT + 1 V < V IN < 6. V; T J = 25 C.1-4 C < T J < 125 C.2 %/V V ADJ %/ IOUT Static load regulation ma < I OUT < 2 A; T J = 25 C.1-4 C < T J < 125 C.4 %/A V IN = 1.4 V; I OUT = 1 A; -4 C < T J < 125 C V DROP Dropout voltage (1) V IN = 2.5 V; I OUT = 2 A; -4 C < T J < 125 C mv V IN = 5.3 V; I OUT = 2 A; -4 C < T J < 125 C en Output noise voltage V OUT = V ADJ ; f = 1 Hz to 1 khz 45 µv RMS / V OUT en Output noise voltage V IN = V OUT +.4 V, I OUT = 7 ma; C IN = C OUT = 1 µf, R2 = 1 kω, R1 = (V OUT.5) x 2 kω, 24 µv RMS C byp = 47 nf V OUT = 1.8 V; V IN = V OUT +.5 V ; C OUT = 1 µf; I OUT = 1 ma; 7 T J = 25 C; f = 1 khz V OUT = 1.8 V; V IN = V OUT +.5 V ; db C OUT = 1 µf; I OUT = 1 ma; 5 SVR Supply voltage rejection T J = 25 C; f = 1 khz V OUT = 1.8 V; V IN = V OUT +.5 V ; C OUT = 1 µf; I OUT = 1 ma; 5 T J = 25 C; f = 5 khz V OUT = 1.8 V; V IN = V OUT +.5 V ; db C OUT = 1 µf; I OUT = 1 ma; 4 T J = 25 C; f = 1 MHz DS179 - Rev 3 page 6/29

7 Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit I OUT = A 1 µa I Q Quiescent current I OUT = A; -4 C < T J < 125 C 3 I OUT = 2 A; 1 ma I OUT = 2 A; -4 C < T J < 125 C 3 Shutdown current Ven =, Vin = 6 V 1 na I SC Short-circuit current V OUT = V 3.5 A I MIN Minimum output current A Enable input logic low 1.25 V < V IN < 6. V V EN Enable input logic high -4 C < T J < 125 C V I EN Enable pin input current V EN = V IN ; 1.25 < V IN < 6. V 1 na PG Power Good output threshold Power Good output voltage low Rising edge.92* V out Falling edge.8*v out Isink = 6 ma open drain output.4 V T Thermal shutdown 17 SHDN Hysteresis 2 C 1. Dropout voltage is the input-to-output voltage difference at which the output voltage is 1 mv below its nominal value; this specification does not apply to nominal output voltages below 1.2 V. (T J = 25 C, V IN = V OUT +1 V; C IN = 1 µf; C OUT = 1 µf; I OUT = 1 ma; V EN = V IN ) Table 6. Electrical characteristics, fixed version Symbol Parameter Test conditions Min. Typ. Max. Unit V IN Operating input voltage range V V OUT Output voltage accuracy T J = 25 C C < T J < 125 C % VADJ% / VIN Static line regulation V OUT + 1 V < V IN < 6. V;.1 T J = 25 C -4 C < T J < 125 C.1 %/V VADJ% / IOUT Static load regulation ma < I OUT < 2 A; T J = 25 C.5-4 C < T J < 125 C.4 %/A V DROP Dropout voltage V OUT = 3.3 V; I OUT = 2 A; -4 C < T J < 125 C mv en Output noise voltage V OUT = 2.5 V; f = 1 Hz to 1 khz 4 µv RMS /V OUT DS179 - Rev 3 page 7/29

8 Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit V OUT = 1.8 V; V IN = V OUT +.5 V ; C OUT = 1 µf; I OUT = 1 ma; T J = 25 C; f = 1 khz 7 V OUT = 1.8 V; V IN = V OUT +.5 V ; C OUT = 1 µf; I OUT = 1 ma; 5 SVR Supply voltage rejection T J = 25 C; f = 1 khz V OUT = 1.8 V; V IN = V OUT +.5 V ; db C OUT = 1 µf; I OUT = 1 ma; 5 T J = 25 C; f = 5 khz V OUT = 1.8 V; V IN = V OUT +.5 V ; C OUT = 1 µf; I OUT = 1 ma; 4 T J = 25 C; f = 1 MHz I Q Quiescent current I OUT = A 1 µa I OUT = A; -4 C < T J < 125 C 3 I OUT = 2 A; 1 ma I OUT = 2 A; -4 C < T J < 125 C 3 Shutdown current Ven =, Vin = 6 V 5 na I SC Short-circuit current V OUT = V 3.5 A I MIN Minimum output current A Enable input logic low 1.25 V < V IN < 6. V V EN Enable input logic high -4 C < T J < 125 C V I EN Enable pin input current V EN = V IN ; 1.25 < V IN < 6. V 1 na PG Power Good output threshold Power Good output voltage low Rising edge.92*v OUT Falling edge.8*v OUT Isink = 6 ma open drain output.4 V T Thermal shutdown 17 SHDN Hysteresis 2 C DS179 - Rev 3 page 8/29

9 Application information 6 Application information 6.1 Thermal and short-circuit protections The LD392 is self-protected from short-circuit conditions and overtemperature. When the output load is higher than the one supported by the device, the output current rises until the limit of typically 3.5 A is reached; at this point the current is kept constant even when the load impedance is zero. The thermal protection acts when the junction temperature reaches 17 C. The IC enters the shutdown status. As soon as the junction temperature falls again below 15 C the device starts working again. In order to calculate the maximum power the device can dissipate, keeping the junction temperature below T J-OP, the following formula is used: P DMAX = 125 T AMB / R THJ A (1) 6.2 Output voltage setting for ADJ version In the adjustable version, the output voltage can be set from.5 V up to the input voltage minus the voltage drop across the pass transistor (dropout voltage), by connecting a resistor divider between the ADJ pin and the output, allowing remote voltage sensing. The resistor divider can be selected using the following equation: V OUT = V ADJ 1 + R1/ R2, with V ADJ =.5 V typ. (2) 6.3 Enable pin The LD392 features an enable function. When the EN voltage is higher than 1.2 V the device is ON, and if it is lower than.5 V the device is OFF. In shutdown mode, the total current consumption is 1 na (typ). The EN pin does not have an internal pull-up, therefore it cannot be left floating if it is not used. 6.4 Power Good pin (PG) Some applications require a flag showing that the output voltage is in the correct range. Power Good threshold depends on the output voltage. When the output voltage is higher than.92 * V OUT(nom), the PG pin goes to high impedance. If the output voltage is below.8 * V OUT(nom) the PG pin goes to low impedance. If the device works well, the PG pin is at high impedance. 6.5 Reverse current protection The device avoids the reverse current to flow from the output to the input during any operating condition (EN = or EN = 1, V IN > V OUT + V DROP ). During fast turn-on/off this function prevents a big current from flowing to the input. Moreover it is used to avoid the reverse current to flow from the output pin to the input one, when other power supplies, providing a voltage higher than the input voltage, are connected to the output pin. If a power supply, providing a voltage lower than LDO output voltage, is connected to OUT pin, LDO works in current protection, causing high power dissipation inside the device. When the device is disabled (EN = low) and V OUT > V, a small current (few µa) is sunk from the OUT pin. DS179 - Rev 3 page 9/29

10 Typical performance characteristics 7 Typical performance characteristics (The following plots are referred to the typical application circuit and, unless otherwise noted, at T A = 25 C) Figure 4. Dropout voltage vs. temperature (Vin = 1.3 V, Iout = 1 A) Figure 5. Dropout voltage vs. temperature (Vin = 1.4 V, Iout = 1 A) mv 15 1 mv Temperature ºC Temperature ºC AM1391V1 AM13911V1 Figure 6. Dropout voltage vs. temperature (Vin = 1.4 V, Iout = 2 A) Figure 7. Dropout voltage vs. temperature (Vin = 1.5 V, Iout = 1 A) mv mv Temperature ºC AM13912V1 Temperature ºC AM13913V1 DS179 - Rev 3 page 1/29

11 Typical performance characteristics Figure 8. Dropout voltage vs. temperature (Vin = 1.5 V, Iout = 2 A) Figure 9. Dropout voltage vs. temperature (Vin = 2.5 V, Iout = 1 A) mv mv Temperature ºC AM13914V1 Temperature ºC AM13915V1 Figure 1. Dropout voltage vs. temperature (Vin = 2.5 V, Iout = 2 A) Figure 11. Reference voltage vs. temperature (Vin = 1.5 V, Iout = 1 ma) mv Vadj[V] Temperature ºC Temperature ºC AM13916V1 AM13917V1 Figure 12. Quiescent current vs. temperature (Vin = 1.5 V, Iout = ma) Figure 13. Quiescent current vs. temperature (Vin = 1.5 V, Iout = 2 A).3 2 Quiescent current [ma] Quiescent current [ma] Temperature ºC Temperature ºC AM13918V1 AM13919V1 DS179 - Rev 3 page 11/29

12 LD392 Typical performance characteristics Figure 15. Line regulation vs. temperature (1.5 V Vin 6 V, Iout = 1 ma) Figure 14. Quiescent current vs. output current 1.4 Quiescent current [ma] Line regulation [%/V] Output current [ma] Temperature ºC AM1392V2 AM1392V1 Figure 16. Load regulation vs. temperature (Vin = 1.5 V, < Iout < 2 A) Figure 17. SVR vs. frequency SVR [db] Load regulation [%/A] VIN = 2.3V + Vripple VIN = 4.V + Vripple Temperature ºC 1 1 f [Hz] 1 AM13922V1 AM13921V1 Figure 18. Noise spectral density (no Cbyp) Figure 19. Noise spectral density (Cbyp = 47 nf) VIN = 1.6V VOUT = 1.2V CBP = ILOAD =.7A 9. VIN = 1.6V VOUT = 1.2V CBP = 47nF ILOAD =.7A VIN = 3.7V VOUT = 3.3V CBP = ILOAD =.7A 9. VIN = 3.7V VOUT = 3.3V CBP = 47nF ILOAD =.7A VIN = 5.4V VOUT = 5.V CBP = ILOAD =.7A VIN = 5.4V VOUT = 5.V CBP = 47nF ILOAD =.7A 8. en [uv/sqrt(hz)] en [uv/sqrt(hz)] f [Hz] DS179 - Rev AM13923V f [Hz] 1 1 AM13924V1 page 12/29

13 Typical performance characteristics Figure 2. Stability plan Figure 21. Enable startup, Vin = 1.25 V, Iout = 2 A 1 1KHz[Ω] 1.1 STABILITY AREA COUT [µf] (nominal value) AM13925V1 Figure 22. Enable startup, Vin = 6 V, Iout = 2 A Figure 23. Enable startup, no Cbyp V OUT V EN V IN = 3.7 V, V EN = from to 2 V, I OUT = 1 ma, V OUT = 3.3 V, C IN = C OUT = 1 µf, C BYP = GIPG MT Figure 24. Enable startup, Cbyp = 47 nf Figure 25. Line transient V OUT V EN V IN V OUT V IN = 3.7 V, V OUT = 3.3 V, V EN = from to 2V, I OUT = 1 ma, C IN = C OUT = 1 µf, C BYP = 47 GIPG MT V IN = V EN = from 1.5 to 5.5 V, I OUT = 1 ma, N O C IN = C OUT = 1 µf, T RISE = T FALL = 1 µs GIPG MT DS179 - Rev 3 page 13/29

14 Typical performance characteristics Figure 26. Load transient, no Cbyp Figure 27. Load transient, Cbyp = 47 nf V OUT V OUT V IN V IN V IN = 3.7 V, V OUT = 3.3 V, I LOAD = 1 ma to 2 A, C BYP = V IN = 3.7 V, V OUT = 3.3 V, I LOAD = 1 ma to 2 A, C BYP = 47 nf GIPG MT GIPG MT DS179 - Rev 3 page 14/29

15 Package mechanical data 8 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: ECOPACK is an ST trademark. DS179 - Rev 3 page 15/29

16 DFN6 (3 x 3 mm) mechanical data 8.1 DFN6 (3 x 3 mm) mechanical data Figure 28. DFN6 (3 x 3 mm) package outline _C DS179 - Rev 3 page 16/29

17 DFN6 (3 x 3 mm) mechanical data Table 7. DFN6 (3 x 3 mm) mechanical data Dim. mm Min. Typ. Max. A.8 1 A1.2.5 A3.2 b D D E E e.95 L Figure 29. DFN6 (3 x 3 mm) recommended footprint (all dimensions are in mm) _C DS179 - Rev 3 page 17/29

18 DFN6 (3 x 3 mm) tape and reel mechanical data 8.2 DFN6 (3 x 3 mm) tape and reel mechanical data Figure 3. DFN6 (3 x 3 mm) tape outline _N DS179 - Rev 3 page 18/29

19 DFN6 (3 x 3 mm) tape and reel mechanical data Figure 31. DFN6 (3 x 3 mm) reel outline _N Table 8. DFN6 (3 x 3 mm) tape and reel mechanical data Dim. mm Min. Typ. Max. A B K DS179 - Rev 3 page 19/29

20 DFN8 (4 x 4 mm) mechanical data 8.3 DFN8 (4 x 4 mm) mechanical data Figure 32. DFN8 (4 x 4 mm) package outline DS179 - Rev 3 page 2/29

21 DFN8 (4 x 4 mm) mechanical data Table 9. DFN8 (4 x 4 mm) mechanical data Dim. mm Min. Typ. Max. A A1.2.5 A3,2 b D D E E e.8 L Figure 33. DFN8 (4 x 4 mm) recommended footprint (all dimensions are in mm) AM11889v1 DS179 - Rev 3 page 21/29

22 DFN8 (4 x 4 mm) reel mechanical data 8.4 DFN8 (4 x 4 mm) reel mechanical data Figure 34. DFN8 (4 x 4 mm) tape outline (all dimensions are in mm) DS179 - Rev 3 page 22/29

23 DFN8 (4 x 4 mm) reel mechanical data Figure 35. DFN8 (4 x 4 mm) reel outline Table 1. DFN8 (4 x 4 mm) reel mechanical data Dim. mm Min. Typ. Max. A 33 C D 2.2 N 6 T 22.4 DS179 - Rev 3 page 23/29

24 Ordering information 9 Ordering information Table 11. Order codes DFN6 (3 x 3 mm) DFN8 (4 x 4 mm) Output voltage LD392PUR LD392DPUR ADJ LD392PU33R 3.3 V DS179 - Rev 3 page 24/29

25 Revision history Table 12. Document revision history Date Revision Changes 8-Jul Initial release. 6-Jul Updated Table 11: "Order codes". Minor text changes. 17-Sep Updated note Section 3 Typical application. DS179 - Rev 3 page 25/29

26 Contents Contents 1 Block diagram Pin configuration and description Typical application Maximum ratings Electrical characteristics Application information Thermal and short-circuit protections Output voltage setting for ADJ version Enable pin Power Good pin (PG) Reverse current protection Typical performance characteristics Package information DFN6 (3 x 3 mm) package information DFN6 (3 x 3 mm) packing information DFN8 (4 x 4 mm) package information DFN8 (4 x 4 mm) packing information Ordering information...24 Revision history...25 DS179 - Rev 3 page 26/29

27 List of tables List of tables Table 1. DFN6 (3 x 3 mm) package pin description...3 Table 2. DFN8 (4 x 4 mm) package pin description...3 Table 3. Absolute maximum ratings...5 Table 4. Thermal data....5 Table 5. Electrical characteristics, adjustable version... 6 Table 6. Electrical characteristics, fixed version... 7 Table 7. DFN6 (3 x 3 mm) mechanical data Table 8. DFN6 (3 x 3 mm) tape and reel mechanical data Table 9. DFN8 (4 x 4 mm) mechanical data Table 1. DFN8 (4 x 4 mm) reel mechanical data Table 11. Order codes Table 12. Document revision history DS179 - Rev 3 page 27/29

28 List of figures List of figures Figure 1. Block diagram...2 Figure 2. Pin configuration (top view)...3 Figure 3. LD392 typical application schematic...4 Figure 4. Dropout voltage vs. temperature (Vin = 1.3 V, Iout = 1 A)... 1 Figure 5. Dropout voltage vs. temperature (Vin = 1.4 V, Iout = 1 A)... 1 Figure 6. Dropout voltage vs. temperature (Vin = 1.4 V, Iout = 2 A)... 1 Figure 7. Dropout voltage vs. temperature (Vin = 1.5 V, Iout = 1 A)... 1 Figure 8. Dropout voltage vs. temperature (Vin = 1.5 V, Iout = 2 A) Figure 9. Dropout voltage vs. temperature (Vin = 2.5 V, Iout = 1 A) Figure 1. Dropout voltage vs. temperature (Vin = 2.5 V, Iout = 2 A) Figure 11. Reference voltage vs. temperature (Vin = 1.5 V, Iout = 1 ma) Figure 12. Quiescent current vs. temperature (Vin = 1.5 V, Iout = ma) Figure 13. Quiescent current vs. temperature (Vin = 1.5 V, Iout = 2 A) Figure 14. Quiescent current vs. output current Figure 15. Line regulation vs. temperature (1.5 V Vin 6 V, Iout = 1 ma) Figure 16. Load regulation vs. temperature (Vin = 1.5 V, < Iout < 2 A) Figure 17. SVR vs. frequency Figure 18. Noise spectral density (no Cbyp) Figure 19. Noise spectral density (Cbyp = 47 nf) Figure 2. Stability plan Figure 21. Enable startup, Vin = 1.25 V, Iout = 2 A Figure 22. Enable startup, Vin = 6 V, Iout = 2 A Figure 23. Enable startup, no Cbyp Figure 24. Enable startup, Cbyp = 47 nf Figure 25. Line transient Figure 26. Load transient, no Cbyp Figure 27. Load transient, Cbyp = 47 nf Figure 28. DFN6 (3 x 3 mm) package outline Figure 29. DFN6 (3 x 3 mm) recommended footprint (all dimensions are in mm) Figure 3. DFN6 (3 x 3 mm) tape outline Figure 31. DFN6 (3 x 3 mm) reel outline Figure 32. DFN8 (4 x 4 mm) package outline... 2 Figure 33. DFN8 (4 x 4 mm) recommended footprint (all dimensions are in mm) Figure 34. DFN8 (4 x 4 mm) tape outline (all dimensions are in mm) Figure 35. DFN8 (4 x 4 mm) reel outline DS179 - Rev 3 page 28/29

29 IMPORTANT NOTICE PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST s terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. 218 STMicroelectronics All rights reserved DS179 - Rev 3 page 29/29

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