Daewoo DTX-21B4, Service Manual

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CP-520
V
Service Manual
4.5.4 PIN DESCRIPTION
30
4.5.5 CONTROL PART - ELECTRICAL CHARACTERISTICS
PIN NAME SYMBOL DESCRIPTION
1 Drain D MOSFET drain
3 Source/Ground S/GND Ground
4 Supply Vcc Power Supply
5 Overload Protection SS/OLP Overload Protection and Soft Start Operation Time set up
6 Feedback FB
Constant Voltage Control Signal Input,
Burst mode Oscillation Control
7 Overcurrent Protection OCP/BD
Overcurrent Protection Signal Input/
Bottom Detection Signal Input
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Start-Up Operation
Operation Start Voltage V
CC(ON)
Turn-on, V
CC
= 0 19.9 V 16.3 18.2 19.9 V
Soft-Start Operation Stop Voltage V
SS/OLP
1.1 1.2 1.4 V
Soft-Start Oper. Charging Current I
SS/OLP
-390 -550 -710 µA
Operation Stop Voltage V
CC(OFF)
Turn-off, V
CC
= 19.9 8.8 V 8.8 9.7 10.6 V
Circuit Current in Non-Operation I
CC(OFF)
V
CC
A µ 0 0 1 – – V 5 1 =
Normal Operation
Drain-Source Breakdown Voltage V
(BR)DSS
I
D
V – – 0 5 6 A µ 0 0 3 =
Drain Leakage Current I
DSS
V
DS
A µ 0 0 3 – – V 0 5 6 =
On-State Resistance
r
DS(on)
I
D
= 1.9 A, T
J
= +25°C – – 0.96
Ω
t e m i T g n i h c ti w S
f
– – 400 ns
I t n e rr u C t i u c ri C
CC(ON)
– – 6.0 mA
Oscillation Frequency f
osc
19 22 25 kHz
Bottom-Skip Oper. Threshold Volt. V
OCPBD(BS1)
-605 -665 -720 mV
V
OCPBD(BS2)
-385 -435 -485 mV
Quasi-Resonant Oper. Threshold V
OCPBD(TH1)
280 400 520 mV
V
OCPBD(TH2)
670 800 930 mV
Feedback-Pin Threshold Voltage V
FB(OFF)
1.32 1.45 1.58 V
Feedback-Pin Current I
FB(ON)
600 1000 1400 µA
Standby Operation
Standby Operation Start Voltage V
CC(S)
V
CC
= 0 12.2 V 10.3 11.1 12.1 V
Standby Oper. Start Volt. Interval V
CC
1.10 1.35 1.65 V
Standby Non-Operation Current I
CC(S)
V
CC
A µ 6 5 0 2 – V 2 . 0 1 =
Feedback-Pin Current I
FB(ON)
V
CC
A µ 4 1 0 . 4 – V 2 . 0 1 =
Feedback-Pin Threshold Voltage V
FB(S)
V
CC
= 12.2 V 0.55 1.10 1.50 V
Minimum ON Time t
on(min)
0.5 0.8 1.2 µs