Si9114A
Vishay Siliconix
Document Number: 70025
S-42044—Rev. E, 15-Nov-04
www.vishay.com
1
High-Frequency Switchmode Controller
FEATURES
D15- to 200-V Input Range
DCurrent-Mode Control
DInternal Start-Up Circuit
DLatched SHUTDOWN
DSoft-Start
D1.8-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
R
+
−
−
+
+
−
+
−
+
−
FB COMPENSATION
OSC
2 V
Ref
Gen R
S
Q
1.25 V
Undervoltage
0.2 V
9.2 V
SS
Error
Amplifier
VCC
+VIN
ROSC COSC
4.6 V
20 mA
Lockout
VREF
CURRENT
SENSE
−VIN
SHUTDOWN
−VIN
S
Q
NI
VCC
OSC
Out
Enable
SYNC
+−
+
−
4
3
7
14
1
12
11
2
5 6 13 10 8 9
20 mA
Substrate
B 2
DRIVER
OUTPUT
Si9114A
Vishay Siliconix
www.vishay.com
2
Document Number: 70025
S-42044—Rev. E, 15-Nov-04
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)b750 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14-Pin SOIC (Y Suffix)c900 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
Limits
D Suffix −40 to 85_C
Parameter Symbol Oscillator Disabled
−VIN = 0 V, VCC = 10 V MinaTypbMaxaUnit
Reference
OSC Disabled, TA = 25_C 3.94 4.0 4.06
Output Voltage VR OSC Disabled
Over Voltage and Temperature Rangesc3.88 4.0 4.12 V
Short Circuit Current ISREF VREF = −VIN −30 −5 mA
Load Regulation DVR/DIRIREF = 0 to −1 mA 10 40 mV
Oscillator
Initial Accuracy
fOSCd
ROSC = 374 kW, COSC = 200 pF 90 100 110
kHz
Initial Accuracy fOSC
d
ROSC = 70 kW, COSC = 200 pF 450 500 550 kHz
Voltage StabilitycDf/f ROSC = 70 kW, COSC = 200 pF
Df/f = [f(16.5 V) − f(9.5 V)] / f(9.5 V) 4 7 %
Temperature CoefficientcOSC TC −40 v TA v 85_C, fOSC = 100 kHz 200 500 ppm/_C
Sync Output Current (Master Mode) ISYNC(M) VROSC v 5 V "1.0 "3.0 mA
Sync Output Current (Slave Mode) ISYNC(S) VROSC = VCC "1"500 nA
Error Amplifier (COSC = −VIN OSC Disabled)
Input BIAS Current IFB VFB = 5 V, NI = VREF <1.0 "200 nA
Input OFFSET Voltage VOS2 "5"25 mV
Open Loop Voltage GaincAVOL 65 80 dB
Unity Gain BandwidthcBW 1.8 2.7 MHz
Output Current
IOUT
Source (VFB = 3.5 V, NI = VREF)−2.7 −1.0
mA
Output Current IOUT Sink (VFB = 4.5 V, NI = VREF) 1.0 2.4 mA
Power Supply Rejection PSRR 9.5 V v VCC v 16.5 V 50 80 dB
Si9114A
Vishay Siliconix
Document Number: 70025
S-42044—Rev. E, 15-Nov-04
www.vishay.com
3
SPECIFICATIONS
Limits
D Suffix −40 to 85_C
Test Conditions
Unless Otherwise Specified
Oscillator Disabled
−VIN = 0 V, VCC = 10 VParameter UnitMaxa
Typb
Mina
Test Conditions
Unless Otherwise Specified
Oscillator Disabled
−VIN = 0 V, VCC = 10 VSymbol
Pre-Regulator/Start-Up
Input Leakage Current +IIN +VIN = 200 V, VCC w 10 V t1 10 mA
Pre-Regulator Start-Up Current ISTART +VIN = 48 V, tPW v 300 ms, VCC = VUVLO 8 20 mA
VCC Pre-Regulator Voltage VPR +VIN = 48 V 8.8 9.1 9.4
VPR −VUVLO (Turn-On) VDELTA 0.1 0.25 0.7 V
Undervoltage Lockout Hysteresis VHYST 0.18 0.28 0.4
Supply
Supply Current
ICC
CLOAD v 50 pF
fOSC = 100 kHz 1.5 2.5
mA
Supply Current ICC CLOAD v 50 pF fOSC = 500 kHz 2.2 3.0 mA
Protection
Current Limit Threshold Voltage VSENSE VFB = 0 V, NI = VREF 1.15 1.23 1.30 V
Current Limit Delay to OutputctdVSENSE = 1.5 V, See Figure 1 77 100 ns
SHUTDOWN Logic Threshold VSD 2.8 0.5 V
SHUTDOWN Delay to Latched OutputctSD See Figure 2 0.20 1.0 ms
SHUTDOWN Pull-Up Current ISD VSD = 0 V 12 23 30
mA
Soft-Start Current ISS 12 23 30 mA
Output Inhibit Voltage VSS(off) Soft-Start Voltage to Disable Driver Output 1.6 0.5 V
MOSFET Driver
Output High Voltage VOH IOUT = −10 mA 9.85 9.9
V
Output Low Voltage VOL IOUT = 10 mA 0.05 0.15 V
Peak Output Currentc
ISOURCE VOUT = 0 V −400 −200
mA
Peak Output Currentc
ISINK VOUT = VCC 500 1000 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.
Si9114A
Vishay Siliconix
www.vishay.com
4
Document Number: 70025
S-42044—Rev. E, 15-Nov-04
TYPICAL CHARACTERISTICS
Oscillator Frequency Output Driver Rise and Fall Time
Switching Frequency vs. Supply Voltage
Supply Current vs. Output Frequency Supply Current vs. Supply Voltage
(kHz)f OUT
Output Rise and Fall Time (ns)
Switching Frequency (MHz)
− Supply Current (mA)
ICC
VCC − Supply Voltage (V)
VCC − Supply Voltage (V)
VCC − Supply Voltage (V)
fOUT − Output Frequency (kHz)
− Supply Current (mA)
ICC
1000
10
100
10
100 1000
47 pF
200 pF
100 pF
150 pF
Note: These curves were measured
in a board with 3.5 pF of
external parasitic
capacitance.
0
0
9 10111213141516
20
40
60
80
tr for CL = 2500 pF
tf for CL = 2500 pF
17
tr for CL = 1000 pF
tf for CL = 1000 pF
36
0 200 400 600 800 1000
28
20
12
4
0
32
24
16
8
CL = 2500 pF
CL = 1000 pF
CL = 0 pF
VCC = 12 V
COSC = 47 pF
0
0
9 10111213141516
3
6
9
12
17
ROSC = 127 kW
COSC = 47 pF
fs = 500 kHz
CL = 1000 pF
CL = 0 pF
8
0
9 10111213141516
0.85
0.90
1.00
1.05
17
0.95
ROSC = 56 kW
COSC = 47 pF
rOSC − Oscillator Resistance (kW)
tr 10% to 90%
tf 90% to 10%
+VIN VCC
SHUTDOWN CURRENT SENSE
VREF DRIVER OUTPUT
NI −VIN
FB SYNC
COMPENSATION COSC
SS ROSC
Dual-In-Line and SOIC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Top View
Si9114A
Vishay Siliconix
Document Number: 70025
S-42044—Rev. E, 15-Nov-04
www.vishay.com
5
TIMING WAVEFORMS
90%
1.5 V−
50%
0
90%
Output
50%
td
tr v 10 ns tf v 10 ns
VCC
tSD
SHUTDOWN
VCC
00
VCC−
Current
Sense
Output
FIGURE 1. FIGURE 2.
PIN CONFIGURATIONS AND ORDERING INFORMATION
ORDERING INFORMATION
Part Number Temperature Range Package
Si9114ADY
Si9114ADY-T1 SOIC-14
Si9114ADY-T1—E3 −40 to 85_C
Si9114ADJ
PDIP-14
Si9114ADJ—E3
PDIP
-
1
4
APPLICATIONS
+VIN
SD
VREF
NI
FB
COMP
SS
VCC
SENSE
OUT
−VIN
SYNC
COSC
ROSC
−48 V (−42 to −56 V)
Si9114A
TL431
Si9420DY
FIGURE 3. 15-W Forward Converter Schematic
VO
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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.
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Document Number: 91000 www.vishay.com
Revision: 08-Apr-05 1
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Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
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Ø
ALL LEADS
0.101 mm
0.004″
E
D
eBA1
A
H
L
C
0.25
(GAGE PLANE)
1234567
14 13 12 11 10 9 8
Package Information
Vishay Siliconix
Document Number: 72809
28-Jan-04
www.vishay.com
1
SOIC (NARROW): 14-LEAD (POWER IC ONLY)
MILLIMETERS INCHES
Dim Min Max Min Max
A1.35 1.75 0.053 0.069
A10.10 0.20 0.004 0.008
B0.38 0.51 0.015 0.020
C0.18 0.23 0.007 0.009
D8.55 8.75 0.336 0.344
E3.8 4.00 0.149 0.157
e1.27 BSC 0.050 BSC
H5.80 6.20 0.228 0.244
L0.50 0.93 0.020 0.037
Ø0_8_0_8_
ECN: S-40080—Rev. A, 02-Feb-04
DWG: 5914
E1E
Q1
A
L
A1
e1B
B1
S
C
eA
D
15°
MAX
1234567
14 13 12 11 10 9 8
Package Information
Vishay Siliconix
Document Number: 72814
28-Jan-04
www.vishay.com
1
PDIP: 14-LEAD (POWER IC ONLY)
MILLIMETERS INCHES
Dim Min Max Min Max
A3.81 5.08 0.150 0.200
A10.38 1.27 0.015 0.050
B0.38 0.51 0.015 0.020
B10.89 1.65 0.035 0.065
C0.20 0.30 0.008 0.012
D17.27 19.30 0.680 0.760
E7.62 8.26 0.300 0.325
E15.59 7.11 0.220 0.280
e12.29 2.79 0.090 0.110
eA7.37 7.87 0.290 0.310
L2.79 3.81 0.110 0.150
Q11.27 2.03 0.050 0.080
S1.02 2.03 0.040 0.080
ECN: S-40081—Rev. A, 02-Feb-04
DWG: 5919
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Revision: 12-Mar-12 1Document Number: 91000
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