Document
Si9102
Vishay Siliconix
3-W High-Voltage Switchmode Regulator
FEATURES
D 10- to 120-V Input Range D Current-Mode Control D On-chip 200-V, 7-W MOSFET Switch D SHUTDOWN and RESET D High Efficiency Operation (> 80%) D Internal Start-Up Circuit D Internal Oscillator (1 MHz)
DESCRIPTION
The Si9102 high-voltage switchmode regulator is a monolithic BiC/DMOS integrated circuit which contains most of the components necessary to implement a high-efficiency dc-to-dc converter up to 3 watts. It can either be operated from a low-voltage dc supply, or directly from a 10- to 120-V unregulated dc power source. This device may be used with an appropriate transformer to implement most single-ended isolated power converter topologies (i.e., flyback and forward). The Si9102 is available in both standard and lead (Pb)-free 14-pin plastic DIP and 20-pin PLCC packages which are specified to operate over the industrial temperature range of −40 _C to 85 _C.
FUNCTIONAL BLOCK DIAGRAM
FB 14 (20)
COMP 13 (18) Error Amplifier
DISCHARGE 9 (12)
OSC IN 8 (11)
OSC OUT 7 (10)
OSC 2V − + + − 1.2 V C/L Comparator Clock (1/2 fOSC) Current-Mode Comparator R Q S 3 (5) 5 (8) DRAIN −VIN (BODY)
VREF
10 (14)
− + 4 V (1%) Ref Gen
BIAS
1 (2)
Current Sources
VCC
6 (9)
To Internal Circuits
4 (7) VCC Undervoltage Comparator Q R 11 (16) 12 (17)
SOURCE
+VIN
2 (3) 8.8 V − + 9.4 V
− +
S
SHUTDOWN RESET
Note: Figures in parenthesis represent pin numbers for 20-pin package.
Document Number: 70001 S-42040—Rev. G, 15-Nov-04
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Si9102
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to −VIN (VCC < +VIN + 0.3 V) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 V VDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 V ID (Peak) (Note: 300 ms pulse, 2% duty cycle) . . . . . . . . . . . . . . . . . . . . . . 2 A ID (rms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA Logic Inputs (RESET, SHUTDOWN, OSC IN) . . . . . . −0.3 V to VCC + 0.3 V Linear Inputs (FEEDBACK, SOURCE) . . . . . . . . . . . . . . . . . . . −0.3 V to 7 V HV Pre-Regulator Input Current (continuous) . . . . . . . . . . . . . . . . . . . . . 3 mA Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to 125_C Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40 to 85_C Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C Power Dissipation (Package)a 14-Pin Plastic DIP (J Suffix)b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 mW 20-Pin PLCC (N Suffix)c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1400 mW Thermal Impedance (QJA) 14-Pin Plastic DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167_C/W 20-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90_C/W Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 6 mW/_C above 25_C c. Derate 11.2 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
Voltages Referenced to −VIN VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5 V to 13.5 V ROSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kW to 1 MW Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 7 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 120 V fOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 kHz to 1 MHz Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC
SPECIFICATIONSa
Test Conditions Unless Otherwise Specified
DISCHARGE = −VIN = 0 V VCC = 10 V, +VIN = 48 V RBIAS = 390 kW , ROSC = 330 kW
Limits
D Suffix −40 to 85_C
Parameter Reference
Output Voltage Output Impedancee Short Circuit Current Temperature Stabilitye
Symbol
Tempb
Mind
Typc
Maxd
Unit
VR ZOUT ISREF TREF
OSC IN = − VIN (OSC Disabled) RL = 10 MW
Room Full Room
3.92 3.86 15 70
4.0 30 100 0.5
4.08 4.14 45 130 1.0
V kW mA mV/_C
VREF = −VIN
Room Full
Oscillator
.