Fairchild FSDH321, Manual

Page: 5 / 20

FSDH321, FSDL321
5
Electrical Characteristics
(Ta = 25
°
C unless otherwise specified)
Note :
1. Pulse test: Pulse width
≤
300us, duty
≤
2%
2. These parameters, although guaranteed, are tested in EDS (wafer test) process
3. These parameters, although guaranteed, are not 100% tested in production
Parameter Symbol Condition Min. Typ. Max. Unit
SENSE FET SECTION
Zero-Gate-Voltage Drain Current I
DSS
V
DS
=650V, V
GS
=0V - - 25
µ
A
V
DS
=520V, V
GS
=0V, T
C
=125
°
C
- - 200
Drain-Source On-State Resistance R
DS(ON)
V
GS
=10V, I
D
=0.5A - 14 19
Ω
Forward Trans-Conductance
(1)
g
fs
V
DS
=50V, I
D
=0.5A 1.0 1.3 - S
Input Capacitance C
ISS
V
GS
=0V, V
DS
=25V,
f=1MHz
- 162 -
pF Output Capacitance C
OSS
- 18 -
Reverse Transfer Capacitance C
RSS
- 3.8 -
Turn-On Delay Time t
d(on)
V
DS
=325V, I
D
=1.0A
- 9.5 -
ns
Rise Time t
r
- 19 -
Turn-Off Delay Time t
d(off)
- 33 -
Fall Time t
f
- 42 -
Total Gate Charge Q
g
V
GS
=10V, I
D
=1.0A,
V
DS
=325V
- 7.0 -
nC Gate-Source Charge Q
gs
- 3.1 -
Gate-Drain (Miller) Charge Q
gd
- 0.4 -
CONTROL SECTION
Switching Frequency f
OSC
FSDH321
90 100 110 KHz
Switching Frequency Modulation
∆
f
MOD
±2.5 ±3.0 ±3.5 KHz
Switching Frequency f
OSC
FSDL321
45 50 55 KHz
Switching Frequency Modulation
∆
f
MOD
±1.0 ±1.5 ±2.0 KHz
Switching Frequency Variation
(2)
∆
f
OSC
-25
°
C
≤
Ta
≤
85
°
C - ±5 ±10 %
Maximum Duty Cycle D
MAX
FSDH321 62 67 72 %
FSDL321 71 77 83 %
UVLO Threshold Voltage
V
START
V
FB
=GND 11 12 13 V
V
STOP
V
FB
=GND 7 8 9 V
Feedback Source Current I
FB
V
FB
=GND 0.7 0.9 1.1 mA
Internal Soft Start Time t
S/S
V
FB
=4V 10 15 20 ms
BURST MODE SECTION
Burst Mode Voltage
V
BURH
Tj=25
°
C
0.4 0.5 0.6 V
V
BURL
0.25 0.35 0.45 V
V
BUR(HYS)
Hysteresis - 150 - mV
PROTECTION SECTION
Peak Current Limit I
LIM
Tj=25
°
C,
∆
i/
∆
t=250mA/us 0.60 0.70 0.80 A
Current Limit Delay Time
(3)
t
CLD
Tj=25
°
C - 600 - ns
Thermal Shutdown Temperature
(3)
T
SD
125 145 -
°
C
Shutdown Feedback Voltage V
SD
5.5 6.0 6.5 V
Over Voltage Protection V
OVP
18 19 20 V
Shutdown Delay Current I
DELAY
V
FB
=4V 3.5 5.0 6.5
µ
A
Leading Edge Blanking Time t
LEB
200 - - ns
TOTAL DEVICE SECTION
Operating Supply Current
(control part only)
I
OP
V
CC
=14V, V
FB
=0V 1 3 5 mA
Start-Up Charging Current I
CH
V
CC
=0V 0.7 0.85 1.0 mA
Vstr Supply Voltage V
STR
V
CC
=0V 35 - - V