Old part no. DS 879D-12-4 Welding diode Properties Key parameters High forward current capability V RRM = 4 V Low forward and reverse recovery losses I FAVm = 11 3 A High operational reliability I FSM = 8 A V TO =.74 V Applications r T =.18 m Welding equipment High current application up to 2 Hz Types type Conditions: V RRM 4 V T j = -4 17 C, half sine waveform, f = Hz Mechanical data F m Mounting force 3 4 kn m Weight.22 kg D S Surface creepage distance 4 mm D a Air strike distance 4 mm Fig. 1 Case ABB s.r.o. Novodvorska 1768/138a, 142 21 Praha 4, Czech Republic tel.: +42 261 36 2, http://www.abb.com/semiconductors TS - DS/36/c Jan-14 1 of 6
Maximum Ratings Maximum Limits Unit V RRM I FAVm I FRMS I R I FSM I 2 t Repetitive peak reverse voltage T j = -4 17 C Average forward current T c = 8 C RMS forward current T c = 8 C Repetitive reverse current V R = V RRM Nonrepetitive peak surge current t p = 1 ms, V R = V, half sine pulse Limiting load integral t p = 1 ms, V R = V, half sine pulse 4 V 11 3 A 17 8 A ma 8 A 36 A 2 s T jmin T jmax Operating temperature range - 4 17 C T stgmin - T stgmax Storage temperature range - 4 17 C Unless otherwise specified T j = 17 C Characteristics Value Unit min typ max V T Threshold voltage.74 V r T V FM Q rr Forward slope resistance I F1 = 8 A, I F2 = 18 A Maximum forward voltage I FM = 8 A Recovered charge I FM = 1 A, di/dt = -3 A/ s, V R = V.18 m.83.88 V 3 C Unless otherwise specified T j = 17 C Thermal Specifications Value Unit R thjc R thch Thermal resistance junction to case Thermal resistance case to heatsink double side cooling 6 K/kW single side cooling 12 double side cooling 3 K/kW single side cooling 6 TS - DS/36/c Jan-14 2 of 6
I F ( A ) I FSM ( ka ) i 2 dt (1 6 A 2 s) Transient thermal impedance junction to case Z thjc ( K/kW ) Analytical function for transient thermal impedance Z thjc 4 i 1 R (1 exp( t / )) i Conditions: F m = 3 4 kn, Double side cooled i i 1 2 3 4 R i ( K/kW ) 4.67.8219.448.87 i ( s ).83.172.4.2 7 6 4 3 2 1.1.1.1.1 1 Square wave pulse duration t d ( s ) Fig. 2 Dependence transient thermal impedance junction to case on square pulse 2 T j = 17 C 16 I FSM 6 2 14 i 2 dt 1 12 4 1 3 1 8 2 6 1. 1 1. V F ( V ) 4 1 1 t ( ms ) 1 Fig. 3 Maximum forward voltage drop characteristics Fig. 4 Surge forward current vs. pulse length, half sine wave, single pulse, V R = V, T j = T jmax TS - DS/36/c Jan-14 3 of 6
T C ( C ) T C ( C ) P T ( W ) P T ( W ) 18 16 14 y = 6 12 18 18 16 14 y = 3 6 9 12 18 12 1 12 1 27 8 8 6 6 4 4 2 2 2 4 6 8 1 12 2 4 6 8 1 12 Fig. Forward power loss vs. average forward current, sine waveform, f = Hz Fig. 6 Forward power loss vs. average forward current, square waveform, f = Hz 18 17 16 1 14 13 12 18 17 16 1 14 13 12 11 11 1 9 8 18 1 9 8 27 18 7 6 12 y =6 2 4 6 8 1 12 7 6 y = 3 2 4 6 8 1 12 6 12 9 Fig. 7 Max. case temperature vs. aver. forward current, sine waveform, f = Hz Fig. 8 Max.case temperature vs. aver. forward current, square waveform, f = Hz TS - DS/36/c Jan-14 4 of 6
Fig. 9 Definition of ED for typical welding sequence Fig. 1 Definition of I D for single-phase centre tap 3 3 T 1 = 2 ms 3 3 T 1 = 2 ms 2 4 ms 2 4 ms 2 1 ms 2 1 2 ms 1 ms / 1 1 ms 2 ms 1 ms / 1 1 1 1 1 1 1 1 Fig. 11 Current load capacity, cont., output welding current with single-phase f = 1 Hz, square wave, T j = 8 C Fig. 12 Current load capacity, cont., output welding current with single-phase f = 1 Hz, square wave, T j = 7 C TS - DS/36/c Jan-14 of 6
3 3 3 3 T 1 = 2 ms 2 2 2 4 ms 2 T 1 = 2 ms 1 1 ms 2 ms 1 4 ms 1 1 ms / 1 1 ms 2 ms 1 ms / 1 1 1 1 1 1 Fig. 13 Current load capacity, cont., output welding current with single-phase f = 1 Hz, square wave, T j = 6 C Fig. 14 Current load capacity, cont., output welding current with single-phase f = 1 Hz, square wave, T j = 4 C Notes: TS - DS/36/c Jan-14 6 of 6