Index DW9937S, Service Manual

Page: 57 / 112

FSDM07652RB
Electrical Characteristics
(Ta = 25
°
C unless otherwise specified)
Parameter Symbol Condition Min. Typ. Max. Unit
Sense FET SECTION
Drain source breakdown voltage BV
DSS
V
GS
= 0V, I
D
= 250
µ
A 650 - - V
Zero gate voltage drain current I
DSS
V
DS
= 650V, V
GS
= 0V - - 50
µ
A
V
DS
= 520V
V
GS
= 0V, T
C
= 125
°
C
- - 200
µ
A
Static drain source on resistance
(1)
R
DS(ON)
V
GS
= 10V, I
D
= 2.5A - 1.4 1.6
Ω
Output capacitance C
OSS
V
GS
= 0V, V
DS
= 25V,
f = 1MHz
- 100 - pF
Turn on delay time T
D(ON)
V
DD
= 325V, I
D
= 5A
(MOSFET switching
time is essentially
independent of
operating temperature)
- 22 -
ns
Rise time T
R
- 60 -
Turn off delay time T
D(OFF)
- 115 -
Fall time T
F
- 65 -
CONTROL SECTION
Initial frequency F
OSC
V
FB
= 3V 60 66 72 kHz
Voltage stability F
STABLE
13V
≤
Vcc
≤
18V 0 1 3 %
Temperature stability
(2)
∆
F
OSC
-25
°
C
≤
Ta
≤
85
°
C 0
±
5 ±10 %
Maximum duty cycle D
MAX
- 75 80 85 %
Minimum duty cycle D
MIN
- - - 0 %
Start threshold voltage V
START
V
FB
=GND 11 12 13 V
Stop threshold voltage V
STOP
V
FB
=GND 7 8 9 V
Feedback source current I
FB
V
FB
=GND 0.7 0.9 1.1 mA
Soft-start time T
S
Vfb=3 - 10 15 ms
Leading Edge Blanking time T
LEB
- - 250 - ns
BURST MODE SECTION
Burst Mode Voltages
(2)
V
BURH
Vcc=14V - 0.7 - V
V
BURL
Vcc=14V - 0.5 - V
PROTECTION SECTION
Peak current limit
(4)
I
OVER
V
FB
=5V, V
CC
=14V 2.2 2.5 2.8 A
Over voltage protection V
OVP
- 18 19 20 V
Thermal shutdown temperature
(2)
T
SD
130 145 160
°
C
Shutdown feedback voltage V
SD
V
FB
≥
5.5V 5.5 6.0 6.5 V
Shutdown delay current I
DELAY
V
FB
=5V 2.8 3.5 4.2
µ
A
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