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SI9122A 数据表(PDF) 8 Page - Vishay Siliconix

部件名 SI9122A
功能描述  500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers
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制造商  VISHAY [Vishay Siliconix]
网页  http://www.vishay.com
标志 VISHAY - Vishay Siliconix

SI9122A 数据表(HTML) 8 Page - Vishay Siliconix

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Si9122A
Vishay Siliconix
www.vishay.com
8
Document Number: 73492
S–51921—Rev. A, 12-Sep-05
Figure 4.
Detailed Si9122A Block Diagram
Timer
+
132 k
W
EP
+
Bandgap
Reference
3.3 V
Voltage
Feedforward
Frequency
Foldback
OSC
Loop
Control
160
_C Temp
Protection
High Voltage
Interface
VSD VUV VUVLO
Logic
Clock
OTP
VREF
VINDET
+
CL_CONT
ROSC
Oscillator
Clock
60 k
W
VREF/2
PWM
Generator
+
+
VUV
VSD
VREF
550 mV
Logic
DH
BST
LX
High-Side
Primary
Driver
DL
SRH
SRL
PGND
Low-Side
Driver
Synchronous
Driver
(High)
Synchronous
Driver
(Low)
GND
BBM
Current
Control
Gain
100 mV
CS2
CS1
Blanking
CL_CONT
VCC
20
mA
Soft-Start
SS Enable
SS
Si9122A
8 V
+
+
VREG
9.1 V
VCC
VIN
Pre-Regulator
VUVLO
8.6 V
9.1 V
VCC
VCC
VCC
DETAILED OPERATION
Start-Up
When VINEXT rises above 0 V, the internal pre-regulator begins
to charge up the Vcc capacitor. Current into the external VCC
capacitor is limited to typically 40 mA by the internal DMOS
device. When Vcc exceeds the UVLO voltage of 8.8 V a
soft-start cycle of the switch mode supply is initiated. The VCC
supply continues to be charged by the pre-regulator until VCC
equals VREG. During this period, between VUVLO and VREG,
excessive load current will result in VCC falling below VUVLO
and stopping switch mode operation. This situation is avoided
by the hysteresis between VREG and VUVLO and correct sizing
of the VCC capacitor, bootstrap capacitor and the soft-start
capacitor. The value of the VCC capacitor should therefore be
chosen to be capable of maintaining switch mode operation
until the required VCC current can be supplied from the external
circuit (e.g via a power transformer winding and zener
regulator). Feedback from the output of the switch mode
supply charges VCC above VREG and fully disconnects the
pre-regulator, isolating VCC from VIN. VCC is then maintained
above VREG for the duration of switch mode operation. In the
event of an over voltage condition on VCC, an internal voltage
clamp turns on at 14.5 V to shunt excessive current to GND.


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