SI9124 Datasheet, PDF (3/16 Pages) Vishay Siliconix – 500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control

New Product
Si9124
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS (ALL VOLTAGES REFERENCED TO GND = 0 V)
V_IN (Continuous) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 V
V_IN (100 ms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V
V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5 V
V_CC2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5 V
V_REF, R_OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3 V to V_CC + 0.3 V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3 V to V_CC + 0.3 V
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3 V to V_CC + 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 Dissipation^a
TSSOP-16 (T_A = 25_C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25 W
Thermal Impedance (Q_JA)
TSSOP-16^b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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)
V_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 to 72 V
C_VIN1 ^{ø CVIN2} . . . . . . . . . . . . . . . . . . . . . . . 100 mF/ESR v 100 mW and 0.1 mF
V_CC Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 to 13.2 V
CV_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7 mF
f_OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 to 600 kHz
R_OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 to 72 kW
R_EXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 kW
C_SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 nF
C_REF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 mF
C_BOOST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1 mF
C_LOAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mF
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V_CC - 0.3 V
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V_CC
Reference Voltage Output Current . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 2.5 mA
SPECIFICATIONS^a
Parameter
Reference (3.3 V)
Output Voltage
Short Circuit Current
Load Regulation
Power Supply Rejection
Oscillator
Accuracy (1% R_OSC)
Max Frequency
Error Amplifier
Input Bias Current
Gain
Bandwidth
Power Supply Rejection
Slew Rate
Current Sense Amplifier
Input Voltage CM Range
Input Amplifier Gain
Input Amplifier Bandwidth
Input Amplifier Offset Voltage
V_CC Hiccup Threshold
Hysteresis
Document Number: 72099
S-03638—Rev. B, 20-Mar-03
Symbol
V_REF
I_SREF
dVr/dlr
PSRR
F_MAX
I_BIAS
A_V
BW
PSRR
SR
V_CM
A_VOL
BW
V_OS
V_THCUP
Test Conditions Unless Specified
CS1 = CS2 = 0 V, f_NOM = 500 kHz, V_IN = 48 V
V_INDET = 4.8 V; 10 V v V_CC v 13.2 V, V_CC2 = V_CC
Limits
- 40 to 85_C
Min^b Typ^c Max^b
Unit
V_CC = 12 V, 25_C Load = 0 mA
V_REF = 0 V
I_REF = 0 to - 2.5 mA
@ 100Hz
3.2
3.3
3.4
V
- 50
mA
- 30
- 75
mV
60
dB
R_OSC = 30 kW, f_NOM = 500 kHz
R_OSC = 24 kW
V_EP = 0 V
@ 100Hz
- 20
20
%
600
kHz
- 40
- 15
mA
- 2.2
V/V
5
MHz
60
dB
0.5
V/ms
V_CS1 - GND, V_CS2 - GND
Increase CS2 Until SS Hiccups
Decrease CS2 Until SS Clamps
"150
17.5
5
"5
150
- 50
mV
dB
MHz
mV
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