FSFR1800US データシートの表示（PDF） - Fairchild Semiconductor
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FSFR1800US Datasheet PDF : 15 Pages
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Electrical Characteristics (Continued)
TA=25°C unless otherwise specified.
Symbol
Parameter
Test Conditions
Specifications
Min Typ Max
Oscillator & Feedback Section
VRT V-I Converter Threshold Voltage
fOSC Output Oscillation Frequency
DC Output Duty Cycle
RT=5.2KΩ
1.5 2.0 2.5
94 100 106
48
50
52
fSS Internal Soft-Start Initial Frequency
tSS Internal Soft-Start Time
Protection Section
fSS=fOSC+40kHz,
RT=5.2KΩ
140
2
3
4
VCssH
VCssL
VOVP
VAOCP
tBAO
Beginning Voltage to Discharge CSS
Beginning Voltage to Charge CSS and Restart
LVCC Over-Voltage Protection
L-VCC > 21V
AOCP Threshold Voltage
ΔV/Δt=-0.1V/µs
AOCP Blanking Time(6)
VCS < VAOCP;
ΔV/Δt=-0.1V/µs
0.9 1.0 1.1
0.16 0.20 0.24
21
23
25
-1.0 -0.9 -0.8
50
VOCP
tBO
OCP Threshold Voltage
OCP Blanking Time(6)
V/Δt=-1V/µs
VCS < VOCP;
ΔV/Δt=-1V/µs
-0.64 -0.58 -0.52
1.0 1.5 2.0
tDA
Delay Time (Low Side) Detecting from VAOCP
to Switch Off(6)
ΔV/Δt=-1V/µs
250 400
TSD Thermal Shutdown Temperature(6)
120 135 150
Dead-Time Control Section
DT
Dead Time(7)
350
Notes:
6. This parameter, although guaranteed, is not tested in production.
7. These parameters, although guaranteed, are tested only in EDS (wafer test) process.
Unit
V
KHz
%
KHz
ms
V
V
V
V
ns
V
μs
ns
°C
ns
© 2009 Fairchild Semiconductor Corporation
FSFR-US Series • Rev.1.0.2
7
www.fairchildsemi.com
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