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SI9114A
Vishay Siliconix
High-Frequency Switchmode Controller
FEATURES
D 15- to 200-V Input Range D Current-Mode Control D Internal Start-Up Circuit D Latched SHUTDOWN D Soft-Start D 1.8-MHz Error Amp
DESCRIPTION
The SI9114A is a BiC/DMOS current-mode pulse width modulation (PWM) controller IC for high-frequency dc/dc converters. Single-ended topologies (forward and flyback) can be implemented at frequencies up to 1 MHz. The oscillator has an internal divide-by-two that limits the duty ratio to 50%. An oscillator sync output allows converters to be synchronized in phase as well as in frequency, in a master/slave configuration. The output inverter can typically source 500 mA and sink 700 mA. Shoot-through current is all but eliminated to minimize supply current requirements. The high-voltage DMOS transistor allows the IC to interface directly to bus voltages up to 200 V. Other features include a 1.5% accurate voltage reference, 1.8-MHz (min) bandwidth error amplifier, shutdown logic control, soft-start and undervoltage lockout circuits.
The SI9114A is available in both standard and lead (Pb)-free 14-pin plastic DIP and SOIC packages, and is specified over the industrial, D suffix (-40_C to 85_C) temperature range.
FUNCTIONAL BLOCK DIAGRAM
CURRENT COMPENSATION SENSE 6 13 Error Amplifier NI 4 - + 2V VREF 3 Ref Gen 4.6 V 7 20 mA + - - + + - 1.25 V -VIN Substrate 20 mA VCC 14 Q 1 - - + + - + 0.2 V 9.2 V Undervoltage Lockout S R 2 SHUTDOWN VCC R S 12 DRIVER OUTPUT 11 -VIN Q Enable
FB 5
SYNC 10 OSC Out
ROSC 8
COSC 9
B2
OSC
SS
+VIN
Document Number: 70025 S-42044--Rev. E, 15-Nov-04
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SI9114A
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to -VIN VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V +VIN (Note: VCC < +VIN + 0.3 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 V Logic Input (SHUTDOWN, SYNC) . . . . . . . . . . . . . . . . -0.3 V to VCC + 0.3 V Linear Inputs (FEEDBACK, SENSE, SOFT-START) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to VCC + 0.3 V HV Pre-Regulator Input Current (continuous) . . . . . . . . . . . . . . . . . . . . . 5 mA Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to 150_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 14-Pin SOIC (Y Suffix)c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW Thermal Impedance (QJA) 14-Pin Plastic Dip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167_C/W 14-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140_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 7.2 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 16.5 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V to 200 V fOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 kHz to 2 MHz ROSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 kW to 1 MW COSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 pF to 200 pF Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC - 4 V Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC
SPECIFICATIONS
Test Conditions Unless Otherwise Specified Parameter Reference
OSC Disabled, TA = 25_C Output Voltage Short Circuit Current Load Regulation VR ISREF DVR/DIR OSC Disabled Over Voltage and Temperature Rangesc VREF = -VIN IREF = 0 to -1 mA 3.94 3.88 4.0 4.0 -30 10 4.06 4.12 -5 40 V mA mV
Limits
D Suffix -40 to 85_C
Symbol
Oscillator Disabled -VIN = 0 V, VCC = 10 V
Mina
Typb
Maxa
Unit
Oscillator
Initial Accuracy Voltage Stabilityc Temperature Coefficientc Sync Output Current (Master Mode) Sync Output Current (Slave Mode) fOSCd Df/f OSC TC ISYNC(M) ISYNC(S) ROSC = 374 kW, COSC = 200 pF ROSC = 70 kW, COSC = 200 pF ROSC = 70 kW, COSC = 200 pF Df/f = [f(16.5 V) - f(9.5 V)] / f(9.5 V) -40 v TA v 85_C, fOSC = 100 kHz VROSC v 5 V VROSC = VCC "1.0 90 450 100 500 4 200 "3.0 "1 "500 110 550 7 500 kHz % ppm/_C mA nA
Error Amplifier (COSC = -VIN OSC Disabled)
Input BIAS Current Input OFFSET Voltage Open Loop Voltage Gainc Unity Gain Bandwidthc IFB VOS2 AVOL BW IOUT PSRR Source (VFB = 3.5 V, NI = VREF) Sink (VFB = 4.5 V, NI = VREF) 9.5 V v VCC v 16.5 V 1.0 50 65 1.8 VFB = 5 V, NI = VREF <1.0 "5 80 2.7 -2.7 2.4 80 -1.0 "200 "25 nA mV dB MHz mA dB
Output Current Power Supply Rejection www.vishay.com
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Document Number: 70025 S-42044--Rev. E, 15-Nov-04
SI9114A
Vishay Siliconix
SPECIFICATIONS
Test Conditions Unless Otherwise Specified Parameter Pre-Regulator/Start-Up
Input Leakage Current Pre-Regulator Start-Up Current VCC Pre-Regulator Voltage VPR -VUVLO (Turn-On) Undervoltage Lockout Hysteresis +IIN ISTART VPR VDELTA VHYST +VIN = 200 V, VCC w 10 V +VIN = 48 V, tPW v 300 ms, VCC = VUVLO +VIN = 48 V 8 8.8 0.1 0.18 t1 20 9.1 0.25 0.28 9.4 0.7 0.4 V 10 mA mA
Limits
D Suffix -40 to 85_C
Symbol
Oscillator Disabled -VIN = 0 V, VCC = 10 V
Mina
Typb
Maxa
Unit
Supply
Supply Current ICC CLOAD v 50 pF fOSC = 100 kHz fOSC = 500 kHz 1.5 2.2 2.5 3.0 mA
Protection
Current Limit Threshold Voltage Current Limit Delay to Outputc SHUTDOWN Logic Threshold SHUTDOWN Delay to Latched Outputc SHUTDOWN Pull-Up Current Soft-Start Current Output Inhibit Voltage VSENSE td VSD tSD ISD ISS VSS(off) Soft-Start Voltage to Disable Driver Output See Figure 2 VSD = 0 V 12 12 VFB = 0 V, NI = VREF VSENSE = 1.5 V, See Figure 1 1.15 1.23 77 2.8 0.20 23 23 1.6 1.30 100 0.5 1.0 30 30 0.5 V ns V ms mA V
MOSFET Driver
Output High Voltage Output Low Voltage Peak Output Currentc VOH VOL ISOURCE ISINK IOUT = -10 mA IOUT = 10 mA VOUT = 0 V VOUT = VCC 500 9.85 9.9 0.05 -400 1000 0.15 -200 V mA
Notes a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. c. Guaranteed by design, not subject to production test. d. CSTRAY v 5 pF on COSC.
Document Number: 70025 S-42044--Rev. E, 15-Nov-04
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SI9114A
Vishay Siliconix
TYPICAL CHARACTERISTICS
Oscillator Frequency
1000 47 pF 100 pF 150 pF 200 pF f OUT (kHz) 80
Output Driver Rise and Fall Time
tr for CL = 2500 pF
Output Rise and Fall Time (ns)
60 tf for CL = 2500 pF 40 tr for CL = 1000 pF 20 tr 10% to 90% tf 90% to 10% 0 tf for CL = 1000 pF
100
Note: These curves were measured in a board with 3.5 pF of external parasitic capacitance. 10 10 100 rOSC - Oscillator Resistance (kW) 1000
0
9
10
11
12
13
14
15
16
17
VCC - Supply Voltage (V)
Supply Current vs. Output Frequency
36 32 28 I CC - Supply Current (mA) I CC - Supply Current (mA) 24 20 16 12 8 4 0 0 200 400 600 800 1000 fOUT - Output Frequency (kHz) CL = 0 pF CL = 2500 pF VCC = 12 V COSC = 47 pF
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Supply Current vs. Supply Voltage
ROSC = 127 kW COSC = 47 pF fs = 500 kHz
9 CL = 1000 pF
6
CL = 1000 pF
3
CL = 0 pF
0 0 9 10 11 12 13 14 15 16 17 VCC - Supply Voltage (V)
1.05
Switching Frequency vs. Supply Voltage
ROSC = 56 kW COSC = 47 pF
1.00 Switching Frequency (MHz)
0.95
0.90
0.85
0 8 9 10 11 12 13 14 15 16 17 VCC - Supply Voltage (V) Document Number: 70025 S-42044--Rev. E, 15-Nov-04
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SI9114A
Vishay Siliconix
TIMING WAVEFORMS
Current Sense 1.5 V- 50% 0 td VCC- Output 0 0 VCC tr v 10 ns SHUTDOWN 50% tSD 90% tf v 10 ns
Output
VCC
90%
FIGURE 1.
FIGURE 2.
PIN CONFIGURATIONS AND ORDERING INFORMATION
Dual-In-Line and SOIC
+VIN SHUTDOWN VREF NI FB COMPENSATION SS 1 2 3 4 5 6 7 Top View 14 13 12 11 10 9 8 VCC CURRENT SENSE DRIVER OUTPUT -VIN SYNC COSC ROSC
ORDERING INFORMATION
Part Number
SI9114ADY SI9114ADY-T1 SI9114ADY-T1--E3 SI9114ADJ SI9114ADJ--E3 -40 to 85_C PDIP-14 SOIC-14
Temperature Range
Package
APPLICATIONS
VO
Si9420DY VCC +VIN SD SENSE VREF OUT -VIN NI FB SYNC COMP COSC SS ROSC
TL431
SI9114A
-48 V (-42 to -56 V)
FIGURE 3. 15-W Forward Converter Schematic
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?70025. Document Number: 70025 S-42044--Rev. E, 15-Nov-04 www.vishay.com
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