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SI9118DY-T1 датащи(PDF) 1 Page - Vishay Siliconix

номер детали SI9118DY-T1
подробное описание детали  Programmable Duty Cycle Controller
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производитель  VISHAY [Vishay Siliconix]
домашняя страница  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

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Vishay Siliconix
Si9118, Si9119
Document Number: 70815
S11-0975–Rev. E, 16-May-11
www.vishay.com
1
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Programmable Duty Cycle Controller
FEATURES
10 to 200 V Input Range
Current-Mode Control
Internal Start-Up Circuit
Buffer Slope Compensation Voltage
Soft-Start
2.7 MHz Error Amp
500 mA Output Drive Current
Light Load Frequency Fold-Back
Low Quiescent Current
Programmable Maximum Duty Cycle, with 80 % as
Default
DESCRIPTION
The Si9118/Si9119 are a BiC/DMOS current-mode pulse
width modulation (PWM) controller ICs for high-frequency
dc/dc converters. Single-ended topologies (forward and
flyback) can be implemented at frequencies up to 1 MHz.
The controller operates in constant frequency mode during
the full load and automatically switches to pulse skipping
mode under light load to maintain high efficiency throughout
the full load range. The maximum duty cycle is easily
programmed with a resistor divider for optimum control.
The push-pull output driver provides high-speed switching to
external MOSPOWER devices large enough to supply 50 W
of output power. Shoot-through current for internal push-pull
stage is almost eliminated to minimize quiescent supply
current.
The push-pull output driver provides high-speed switching to
external MOSPOWER devices large enough to supply 50 W
of output power. Shoot-through current for internal push-pull
stage is almost eliminated to minimize quiescent supply
current.
The high-voltage DMOS transistor permits direct operation
from bus voltages of up to 200 V. Other features include a
1.5 % accurate voltage reference, 2.7 MHz bandwidth error
amplifier, standby mode, soft-start and undervoltage lockout
circuits.
The Si9118/Si9119 are available in both standard and lead
(Pb)-free packages.
FUNCTIONAL BLOCK DIAGRAM
CS
+
+
+
Ref
Gen
100 mV
Undervoltage
8.6 V
Error
Amplifier
VCC
+VIN
4.6 V
23µA
Lockout
VREF
–VIN
-V IN
LIMIT
+
4
3
7
16
1
14
56
11
10
Substrate
+
1.0 - 2.0 V
600 mV
PWM
IMAX
Pulse Skip
NI
SS/EN
+
+
EN
+
2
R
S
Q
SYNC (Si9119)
12
MAX
13
15
DR
8
COSC
9
ROSC
9.3 V (VREG)
OSC


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