AN78xx/AN78xxF Series

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Lester Cameron
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1 3-pin positive output voltage regulator ( type) Overview The N7xx series and the N7xxF series are 3- pin, fixed positive output type monolithic voltage regulators. Stabilized fixed output voltage is obtained from unstable DC input voltage without using any external components. types of fixed output voltage are available; 5, 6, 7,, 9,,, 5,,, and. They can be used widely in power circuits with current capacity of up to. Features No external components : 5, 6, 7,, 9,,, 5,,, Built-in overcurrent limit circuit Built-in thermal overload protection circuit Built-in SO (area of safe operation) protection circuit N7xx series φ3.7±. N7xxF series HSIP3-P- : mm (.35).5±..±.3.± ±.3.5±.3 φ5.3 (.3) (.5).7±. 5.± (3.6) φ3.±. (.) (.5).9±..5±. 7.±. 6.±. 9.± : mm (.73).77±.3.±.5 : Input : Common 3: Output 3.6±.5.5±.5 6.7±.3 7.±.5.7±.3 3.±.5 Block Diagram.5 3 (.).±..±. HSIP3-P-.±.5.5±.5.5± : Input : Common 3: Output Input Pass Tr Current Source Current Limiter Q RSC 3 Output Starter oltage Reference + Error mp. Thermal Protection R R Common

2 bsolute Maximum Ratings at T a = 5 C Parameter Symbol Rating Input voltage I 35 * * Power dissipation N7xx series 5 * 3 P D N7xxF series.5 * 3 W Operating ambient temperature T opr 3 to + C Storage temperature 55 to +5 C * N75/F, N76/F, N77/F, N7/F, N79/F, N7/F, N7/F, N75/F, N7/F * N7/F, N7/F *3 Follow the derating curve. When T j exceeds 5 C, the internal circuit cuts off the output. T stg Electrical Characteristics at T a = 5 C N75, N75F (5 type) O T j = 5 C tolerance O I = to, I O = 5 to, T j = to 5 C, P D * I = 7.5 to 5, T j = 5 C 3 m I = to, T j = 5 C 5 m I O = 5 to.5, T j = 5 C 5 m I O = 5 to 75, T j = 5 C 5 5 m T j = 5 C fluctuation to input (IN) I = 7.5 to 5, T j = 5 C.3 fluctuation to load (L) I O = 5 to, T j = 5 C no f = Hz to khz µ RR I = to, I O =, f = Hz 6 DIF(min) I O =, T j = 5 C f = khz 7 I = 5, T j = 5 C T j = 5 C temperature coefficient O/T a I O = 5, T j = to 5 C m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I =, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w.3

3 Electrical Characteristics at T a = 5 C (continued) N76, 76F (6 type) O T j = 5 C tolerance O I = 9 to, I O = 5 to, T j = to 5 C, P D * fluctuation to input fluctuation to load temperature coefficient I =.5 to 5, T j = 5 C 5 m I = 9 to 3, T j = 5 C.5 6 m (IN) I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I =.5 to 5, T j = 5 C (L) I O = 5 to, T j = 5 C no f = Hz to khz µ RR I = 9 to 9, I O =, f = Hz 59 DIF(min) I O =, T j = 5 C f = khz T j = 5 C I = 5, T j = 5 C O/T a I O = 5, T j = to 5 C m m m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I =, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w N77, 77F (7 type) O T j = 5 C tolerance O I = to, I O = 5 to, T j = to 5 C, P D * fluctuation to input fluctuation to load temperature coefficient I = 9.5 to 5, T j = 5 C 5 m I = to 5, T j = 5 C.5 7 m (IN) I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I = 9.5 to 5, T j = 5 C (L) I O = 5 to, T j = 5 C no f = Hz to khz 6 µ RR I = to, I O =, f = Hz 57 I O =, T j = 5 C DIF(min) f = khz T j = 5 C I = 5, T j = 5 C O/T a I O = 5, T j = to 5 C m m m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I =, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w 3

4 Electrical Characteristics at T a = 5 C (continued) N7, 7F ( type) O T j = 5 C tolerance O I = to 3, I O = 5 to, T j = to 5 C, P D * 7.6. fluctuation to input fluctuation to load temperature coefficient I =.5 to 5, T j = 5 C 6 6 m I = to 7, T j = 5 C m (IN) I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I =.5 to 5, T j = 5 C (L) I O = 5 to, T j = 5 C no f = Hz to khz 5 µ RR I =.5 to.5, I O =, f = Hz 56 DIF(min) I O =, T j = 5 C f = khz T j = 5 C I = 5, T j = 5 C O/T a I O = 5, T j = to 5 C m m m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I =, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w N79, 79F (9 type) O T j = 5 C tolerance O I = to, I O = 5 to, T j = to 5 C, P D * I =.5 to 6, T j = 5 C 7 I = to, T j = 5 C 9 fluctuation to input fluctuation to load temperature coefficient (IN) (L) I O = 5 to, T j = 5 C no f = Hz to khz 57 µ RR I = to, I O =, f = Hz 56 DIF(min) O/T a I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I =.5 to 6, T j = 5 C I O =, T j = 5 C f = khz I = 6, T j = 5 C T j = 5 C I O = 5, T j = to 5 C m m m m m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I = 5, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w

5 Electrical Characteristics at T a = 5 C (continued) N7, 7F ( type) O T j = 5 C 9.6. tolerance O I = 3 to 5, I O = 5 to, T j = to 5 C, P D * I =.5 to 7, T j = 5 C I = 3 to 9, T j = 5 C.5 fluctuation to input fluctuation to load temperature coefficient (IN) m m m m (L) I O = 5 to, T j = 5 C no f = Hz to khz 63 µ RR I = 3 to 3, I O =, f = Hz 56 DIF(min) O/T a I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I =.5 to 7, T j = 5 C I O =, T j = 5 C f = khz I = 7, T j = 5 C T j = 5 C I O = 5, T j = to 5 C 6.6 m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I = 6, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w N7, 7F ( type) O T j = 5 C.5.5 tolerance O I = 5 to 7, I O = 5 to, T j = to 5 C, P D *..6 I =.5 to 3, T j = 5 C I = 6 to, T j = 5 C 3 fluctuation to input fluctuation to load temperature coefficient (IN) m m m m (L) I O = 5 to, T j = 5 C no f = Hz to khz 75 µ RR I = 5 to 5, I O =, f = Hz 55 DIF(min) O/T a I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I =.5 to 3, T j = 5 C I O =, T j = 5 C f = khz I = 3, T j = 5 C T j = 5 C I O = 5, T j = to 5 C. m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I = 9, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w 5

6 Electrical Characteristics at T a = 5 C (continued) N75, 75F (5 type) tolerance O O T j = 5 C I = to 3, I O = 5 to, T j = to 5 C, P D * I = 7.5 to 3, T j = 5 C 3 I = to 6, T j = 5 C 3 5 fluctuation to input fluctuation to load temperature coefficient (IN) (L) no RR DIF(min) O/T a I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I = 7.5 to 3, T j = 5 C I O = 5 to, T j = 5 C f = Hz to khz I =.5 to.5, f = Hz I O =, T j = 5 C f = khz I = 3, T j = 5 C T j = 5 C I O = 5, T j = to 5 C m m m m µ m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I = 3, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w N7, 7F ( type) O T j = 5 C tolerance O I = to 33, I O = 5 to, T j = to 5 C, P D * 7..9 I = to 33, T j = 5 C 36 I = to 3, T j = 5 C fluctuation to input fluctuation to load temperature coefficient (IN) m m m m (L) I O = 5 to, T j = 5 C no f = Hz to khz µ RR I = to 3, I O =, f = Hz 53 DIF(min) O/T a I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I = to 33, T j = 5 C I O =, T j = 5 C f = khz I = 35, T j = 5 C T j = 5 C I O = 5, T j = to 5 C m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I = 7, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w 6

7 Electrical Characteristics at T a = 5 C (continued) N7, 7F ( type) O T j = 5 C 9.. tolerance O I = to 35, I O = 5 to, T j = to 5 C, P D * 9 I = 3 to 35, T j = 5 C 5 I = 6 to 3, T j = 5 C 5 fluctuation to input fluctuation to load temperature coefficient (IN) m m m m (L) I O = 5 to, T j = 5 C no f = Hz to khz µ RR I = to 3, I O =, f = Hz 53 DIF(min) O/T a I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I = 3 to 35, T j = 5 C I O =, T j = 5 C f = khz I = 35, T j = 5 C T j = 5 C I O = 5, T j = to 5 C.. m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I = 9, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w N7, 7F ( type) O T j = 5 C 3 5 tolerance O I = to 3, I O = 5 to, T j = to 5 C, P D *. 5. I = 7 to 3, T j = 5 C I = 3 to 36, T j = 5 C 6 fluctuation to input fluctuation to load temperature coefficient (IN) m m m m (L) I O = 5 to, T j = 5 C no f = Hz to khz 7 µ RR I = to 3, I O =, f = Hz 5 DIF(min) O/T a I O = 5 to.5, T j = 5 C I O = 5 to 75, T j = 5 C T j = 5 C I = 7 to 3, T j = 5 C I O =, T j = 5 C f = khz I = 3, T j = 5 C T j = 5 C I O = 5, T j = to 5 C.. m/ C Note ) The specified condition T j = 5 C means that the test should be carried out within so short a test time (within ms) that the Note ) Unless otherwise specified, I = 33, I O = 5, C I =.33µF and C O =.µf. * N7xx series: 5W, N7xxF series:.5w 7

8 Main Characteristic Curve Power dissipation PD (W) 6 6 P D T a (N7xx series) () () (3) () 6 mbient temperature T a ( C) Power dissipation PD (W) 6 6 P D T a (N7xxF series) () () (3) () 6 mbient temperature T a ( C) DIF(min.) () DIF(min.) T j IO = 5 6 Junction temperature T j ( C) Thermal resistance value: R th(j-c) = 5 C/W (max.) R th(j-a) = 65 C/W (max.) Thermal resistance value: R th(j-c) =. C/W (max.) R th(j-a) = 65 C/W (max.) Installation condition to heat sink Tightening torque 6kg cm Heat radiation compound used () Infinite heat sink: 5.W () 5 C/W heat sink:.5w (3) 5 C/W heat sink: 6.3W () Without heat sink:.93w Installation condition to heat sink Tightening torque 6kg cm Heat radiation compound used () Infinite heat sink:.5w () 5 C/W heat sink: 7.3W (3) 5 C/W heat sink:.5w () Without heat sink:.93w fluctuation (m) Input transient response N75 6 Time t (µs) 5 5 Input voltage I () fluctuation () Load transient response N Time t (µs) Load current IO () O () Current limiting characteristic I = Tj = 5 C N Output current I O ()

9 Basic Regulator Circuit Input C I 3 N7xx N7xxF Common Output C O C I : C I is necessary when the input line is long. C O: C O improves the transient response. Usage Notes. Cautions for a basic circuit I C I D i 3 Figure C O O C I : When a wiring from a smoothing circuit to a three-pin regulator is long, it is likely to oscillate in output. capacitor of.µf to.7µf should be connected near an input pin. C O : When any sudden change of load current is likely to occur, connect an electrolytic capacitor of µf to µf to improve a transitional response of output voltage. D i : Normally unnecessary. But add it in the case that there is a residual voltage at the output capacitor Co even after switching off the supply power because a current is likely to flow into an output pin of the IC and damage the IC.. Other caution items ) Short-circuit between the input pin and GND pin If the input pin is short-circuitted to GND or is cut off when a large capacitance capacitor has been connected to the IC's load, a voltage of a capacitor connected to an output pin is applied between input/output of the IC and this likely results in damage of the IC. It is necessary, therefore, to connect a diode, as shown in figure, to counter the reverse bias between input/output pins. Figure ) Floating of GND pin If a GND pin is made floating in an operating mode, an unstabilized input voltage is outputted. In this case, a thermal protection circuit inside the IC does not normally operate. In this state, if the load is short-circuited or overloaded, it is likely to damage the IC. pplication Circuit Examples. Current bootstrap circuit. djustable output regulator In 3 GND Out + CO Output I.33µF 3Ω Q 3 N7xx N7xxF I O.µF O I O 3 N7xx N7xxF O' R O = O' + + O' R R R Note) O varies due to sample to sample variation of. Never fail to adjust individually with R. 9

AN78xx/AN78xxF Series

AN78xx/AN78xxF Series 3-pin positive output voltage regulator ( type) Overview The N7xx series and the N7xxF series are 3- pin, fixed positive output type monolithic voltage regulators. Stabilized fixed output voltage is obtained