Electrical Characteristics (Continued)
TA=25°C unless otherwise specified.
Specifications
Unit
Symbol
Parameter
Test Conditions
Min
Typ
Max
Oscillator & Feedback Section
VCONDIS Control Pin Disable Threshold Voltage
VCONEN Control Pin Enable Threshold Voltage
0.36
0.54
1.5
94
0.40
0.60
2.0
0.44
0.66
2.5
V
V
VRT
fOSC
DC
V-I Converter Threshold Voltage
Output Oscillation Frequency
Output Duty Cycle
V
RT=5.2KΩ
100
50
106
52
KHz
%
48
fSS=fOSC+40kHz,
RT=5.2KΩ
fSS
tSS
Internal Soft-Start Initial Frequency
Internal Soft-Start Time
140
3
KHz
ms
2
4
Protection Section
IOLP
VOLP
VOVP
OLP Delay Current
VCON=4V
3.6
4.5
21
4.8
5.0
23
6.0
5.5
25
μA
V
OLP Protection Voltage
VCON > 3.5V
L-Vcc > 21V
ΔV/Δt=-0.1V/µs
LVCC Over-Voltage Protection
V
VAOCP AOCP Threshold Voltage
-1.0
-0.9
-0.8
V
VCS < VAOCP
ΔV/Δt=-0.1V/µs
;
tBAO
VOCP
tBO
AOCP Blanking Time(5)
OCP Threshold Voltage
OCP Blanking Time(5)
50
-0.58
1.5
ns
V
-0.64
1.0
-0.52
2.0
V/Δt=-1V/µs
VCS < VOCP
;
μs
ΔV/Δt=-1V/µs
Delay Time (Low Side) Detecting from VAOCP
to Switch Off(5)
tDA
TSD
ISU
250
130
100
400
150
150
ns
°C
μA
V
ΔV/Δt=-1V/µs
Thermal Shutdown Temperature(5)
110
5
Protection Latch Sustain LVCC Supply
Current
LVcc=7.5V
VPRSET Protection Latch Reset LVCC Supply Voltage
Dead-Time Control Section
DT
Dead Time(6)
350
ns
Notes:
5. This parameter, although guaranteed, is not tested in production.
6. These parameters, although guaranteed, are tested only in EDS (wafer test) process.
© 2007 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSFR series • 1.0.3
7
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
