DAEWOO ELECTRONICS DTE-21U6TH, Service Manual

Page: 29 / 63

Service manual CP-785AF
- 28 -
4-7-4 Pins description
pin name symbol description
1 Overcurrent / feedback O.C.P./ F.B. Input of overcurrent detection signal and
feedback signal
2 Source S MOSFET source
3 Drain D MOSFET drain
4 Supply V
IN
Input of power supply for control circuit
5 Ground GND Ground
4-7-5 Control part electrical characteristics
description IC pins symbol rating unit
number min. typ. max.
Operation start voltage 4-5 V
IN
(on) 14.4 16 17.6 V
Operation stop voltage 4-5 V
IN
(off) 9 10 11 V
Circuit current in operation 4-5 I
IN
(on) - - 30 mA
Circuit current in non-operation 4-5 I
IN
(off) - - 100
µ
A
Maximum OFF time -
T
OFF
(
max) 45 - 55
µ
sec
Minimum time for input of quaxi
resonant signals 1-5 T
TH
(2) - - 1.0
µ
sec
Minimum off time - T
OFF
(min) - - 1.5
µ
sec
O.C.P./F.B. terminal threshold
voltage 1 1-5 V
TH
(1) 0.68 0.73 0.78 V
O.C.P./F.B. terminal threshold
voltage 2 1-5 V
TH
(2) 1.3 1.45 1.6 V
O.C.P./F.B. terminal extraction
current 1-2 I
OCP/FB
1.2 1.35 1.5 mA
O.V.P. operation voltage 4-5 V
IN
(OVP) 20.5 22.5 24.5 V
Latch circuit sustaining voltage 4-5 I
IN
(H) - - 400
µ
A
Latch circuit release voltage 4-5 V
IN
(La.off) 6.6 - 8.4 V
Thermal shutdown operating
temperature - T
J
(TSD) 140 - -
0
C
4-7-6 MOSFET electrical characteristics
description IC pins symbol rating unit
number min. typ. max.
Drain-to-source breakdown voltage 3-2 V
DSS
650 - - V
Drain leakage current 3-2 I
DSS
- - 300
µ
A
On-resistance 3-2 R
DS
(on) - - 1.15
Ω
Switching time 3-2 tf - - 250 nsec
Thermal resistance -
θ
CH -F
- - 0.95
0
C/W