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SI9124 Datasheet(PDF) 4 Page - Vishay Siliconix

Part No. SI9124
Description  500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control
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Maker  VISHAY [Vishay Siliconix]
Homepage  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9124 Datasheet(HTML) 4 Page - Vishay Siliconix

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Si9124
Vishay Siliconix
New Product
www.vishay.com
4
Document Number: 72099
S-03638—Rev. B, 20-Mar-03
SPECIFICATIONSa
Limits
- 40 to 85
_C
Test Conditions Unless Specified
CS1 = CS2 = 0 V, fNOM = 500 kHz, VIN = 48 V
VINDET = 4.8 V; 10 V v VCC v 13.2 V, VCC2 = VCC
Parameter
Unit
Maxb
Typc
Minb
Test Conditions Unless Specified
CS1 = CS2 = 0 V, fNOM = 500 kHz, VIN = 48 V
VINDET = 4.8 V; 10 V v VCC v 13.2 V, VCC2 = VCC
Symbol
PWM Operation
Duty Cyclee
DMAX
fOSC = 500 kHz
VEP = 0 V
90
92
95
%
Duty Cyclee
DMIN
fOSC = 500 kHz
VEP = 1.85 V
t15
%
Pre-Regulator
Input Voltage (Continuous)
VIN
IIN = 10 mA
72
V
Input Leakage Current
ILKG
VIN = 72 V, VCC u VREG
10
mA
Regulator Bias Current
IREG1
VIN = 72 V, VINDET t VSD
86
200
mA
Regulator Bias Current
IREG2
VIN = 72 V, VINDET u VREF
4.5
7.5
mA
Pre-Regulator Drive Capacility
ISTART
VCC t VREG
20
mA
V
PR
l t
T
Off
VREG1
VINDET u VREF
7.4
9.1
10.4
VCC Pre-Regulator Turn Off
Threshold Voltage
VREG1
VINDET u VREF
TA = 25_C
8.5
9.1
9.7
Threshold Voltage
VREG2
VINDET = 0 V
9.2
V
Undervoltage Lockoutd
VUVLO
VCC Rising
7.15
8.6
9.8
V
Undervoltage Lockoutd
VUVLO
VCC Rising
TA = 25_C
8.1
8.6
9.3
VUVLO Hysteresis
VUVLOHYS
0.5
Soft-Start
Soft-Start Current Output
ISS1
0
t VSS t 2 Vbe
12
20
28
mA
Soft-Start Current Output
ISS2
2 Vbe t VSS t 4.8 V
60
100
200
mA
Soft-Start Completion Voltage
VSS_COMP
Normal Operation
7.35
8.1
8.85
V
Shutdown
VINDET Shutdown FN
VSD
VINDET Rising
350
550
720
mV
VINDET Hysteresis
VINDET
200
mV
VINDET Input Threshold Voltages
VINDET - VIN Under Voltage
VUV
VINDET Rising
3.13
3.3
3.46
V
VINDET Hysteresis
VINDET
0.3
V
Over Temperature Protection
Activating Temperature
TJ Increasing
160
_C
De-Activating Temperature
TJ Decreasing
130
_C
Converter Supply Current (VCC)
Shutdown
ICC1
Shutdown, VINDET = 0 V
50
140
350
mA
Switching Disabled
ICC2
VINDET t VREF
1.8
2.8
3.8
Switching w/o Loadf
ICC3
VINDET u VREF, fNOM = 500 kHz
3.0
4.4
6.8
Switching with CLOAD
ICC4
VCC = 12 V, OUTA = OUTB = 3 nF, CSEC_SYNC = 0.3 nF
15.2
mA
VCC Hiccup Current
IHCUP
CS2 - CS1 = 200 mV, COUTA = COUTB = 3 nF
CSEC_SYNC = 0.3 nF
4.3


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