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SI9124 Datasheet(PDF) 2 Page - Vishay Siliconix

Part No. SI9124
Description  500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control
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Maker  VISHAY [Vishay Siliconix]
Homepage  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9124 Datasheet(HTML) 2 Page - Vishay Siliconix

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Si9124
Vishay Siliconix
New Product
www.vishay.com
2
Document Number: 72099
S-03638—Rev. B, 20-Mar-03
DESCRIPTION (CONTINUED)
Si9124 has advanced current monitoring circuitry to permit the
user to set the maximum current in the primary circuit. Such a
feature acts as protection against output shorts. Upon sensing
an overload condition, the converter is shut off for a period of
time and then soft-start cycle is re-initiated, achieving hiccup
mode operation. Current sensing is by means of a sense
resistor on the primary device. An integrated over-temperature
shutdown circuit also protects the system.
The 100-V depletion mode MOSFET integrated pre-regulator
circuit permits direct operation from input voltage with only one
series resistor during startup. The pre-regulator automatically
disconnects from the input supply when the output voltage is
established by means of a feedback winding from the filter
inductor.
Si9124 is available in TSSOP-16 pin package. In order to
satisfy the stringent ambient temperature requirements,
Si9124 is rated to handle the industrial temperature range of
–40 to 85
_C.
DETAILED BLOCK DIAGRAM
1.65 V
VFF
-
+
Pre-Regulator
-
+
-
+
VINDET
VREF
VIN
+
-
2.2 R
EP
-
+
PWM
Comparator
SS
-
+
CS2
CS1
Over Current Protection
GND
VUVLO
VUV
VSD
VCC
Hiccup
Mode Start
Driver
Control
and
Timing
OTP
OSC
ROSC
Ramp
SEC_SYNC
PGND
OUTA
SEC_SYNC
Driver
Primary B
Driver
Level
Shift
VCC2
PGND2
Si9124
Peak DET
R
I
VREF
Error Amplifier
4I
Primary A
Driver
Gain
VCC
VCC
Figure 2.
8.8 V
550 mV
OUTB


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