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SI9124 Datasheet(PDF) 3 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) 3 Page - Vishay Siliconix

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Si9124
Vishay Siliconix
New Product
Document Number: 72099
S-03638—Rev. B, 20-Mar-03
www.vishay.com
3
ABSOLUTE MAXIMUM RATINGS (ALL VOLTAGES REFERENCED TO GND = 0 V)
VIN (Continuous)
75 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIN (100 ms)
100 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC
14.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC2
14.5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VREF, ROSC
- 0.3 V to VCC + 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Inputs
- 0.3 V to VCC + 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Inputs
- 0.3 V to VCC + 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SEC_SYNC Drive Current
35 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HV Pre-Regulator Input Current (continuous)
5 mA
. . . . . . . . . . . . . . . . . . . . .
Storage Temperature
- 65 to 150
_C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Junction Temperature
125
_C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipationa
TSSOP-16 (TA = 25_C)
1.25 W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Impedance (
QJA)
TSSOP-16b
100
_C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Notes
a.
Device mounted on JEDEC compliant 1S2P (4 layer) test board.
b.
Derate - 10 mW/
_C above 25_C.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE (ALL VOLTAGES REFERENCED TO GND = 0 V)
VIN
36 to 72 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CVIN1 ø CVIN2
100
mF/ESR v 100 mW and 0.1 mF
. . . . . . . . . . . . . . . . . . . . . . .
VCC Operating
10 to 13.2 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CVCC
4.7
mF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
fOSC
200 to 600 kHz
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ROSC
24 to 72 k
W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REXT
1.4 k
W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CSS
22 nF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CREF
1.0
mF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CBOOST
0.1
mF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLOAD
150
mF
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Inputs
0 to VCC - 0.3 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Inputs
0 to VCC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reference Voltage Output Current
0 to 2.5 mA
. . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONSa
Test Conditions Unless Specified
CS1 = CS2 = 0 V, fNOM = 500 kHz, VIN = 48 V
Limits
- 40 to 85
_C
Parameter
Symbol
CS1 = CS2 = 0 V, fNOM = 500 kHz, VIN = 48 V
VINDET = 4.8 V; 10 V v VCC v 13.2 V, VCC2 = VCC
Minb
Typc
Maxb
Unit
Reference (3.3 V)
Output Voltage
VREF
VCC = 12 V, 25_C Load = 0 mA
3.2
3.3
3.4
V
Short Circuit Current
ISREF
VREF = 0 V
-50
mA
Load Regulation
dVr/dlr
IREF = 0 to - 2.5 mA
-30
-75
mV
Power Supply Rejection
PSRR
@ 100Hz
60
dB
Oscillator
Accuracy (1% ROSC)
ROSC = 30 kW, fNOM = 500 kHz
-20
20
%
Max Frequency
FMAX
ROSC = 24 kW
600
kHz
Error Amplifier
Input Bias Current
IBIAS
VEP = 0 V
-40
-15
mA
Gain
AV
- 2.2
V/V
Bandwidth
BW
5
MHz
Power Supply Rejection
PSRR
@ 100Hz
60
dB
Slew Rate
SR
0.5
V/
ms
Current Sense Amplifier
Input Voltage CM Range
VCM
VCS1 - GND, VCS2 - GND
"150
mV
Input Amplifier Gain
AVOL
17.5
dB
Input Amplifier Bandwidth
BW
5
MHz
Input Amplifier Offset Voltage
VOS
"5
VCC Hiccup Threshold
VTHCUP
Increase CS2 Until SS Hiccups
150
mV
Hysteresis
Decrease CS2 Until SS Clamps
-50
mV


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