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參數(shù)資料
| 型號(hào)： | SI9123 |
| 廠商： | Vishay Intertechnology,Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| 中文描述： | 500千赫半橋型DC - DC與集成的次級(jí)同步整流控制轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大小： | 181K |
| 代理商： | SI9123 |
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Si9123
Vishay Siliconix
New Product
www.vishay.com
8
Document Number: 72098
S-03639—Rev. B, 20-Mar-03
DETAILED FUNCTIONAL BLOCK DIAGRAM
Figure 5.
+
-
132 k
EP
+
-
-
+
-
+
V
REG
9.1 V
V
CC
V
IN
Pre-Regulator
V
UVLO
8.6 V
Reference
Voltage
3.3 V
Voltage
Feedforward
OSC
160 C Temp
Protection
High Voltage
Interface
V
SD
V
UV
V
UVLO
Logic
Clock
OTP
V
REF
V
INDET
-
+
R
OSC
Oscillator
Clock
60 k
V
REF
/2
PWM
Generator
-
+
-
+
V
UV
V
SD
V
REF
550 mV
Logic
D
H
BST
L
X
High-Side
Primary
Driver
D
L
SEC_SYNC
PGND
Low-Side
Primary
Driver
Secondary
Synchronous
Driver
GND
Current
Control
Gain
100 mV
CS2
CS1
V
CC
V
CC
Blanking
SS Enable
V
CC
20 A
80 A
SS Control
SS
V
REF
9.1 V
DETAILED OPERATION
Start-Up
A detailed Functional Block Diagram is shown in
Figure 5
with
additional detail of the pre-regulator shown in
Figure 6
. The
pre-regulator circuit acts as a linear regulator to provide V
CC
directly from the V
INEXT
supply until the V
CC
supply voltage
between 10 V to 13.2 V can be sustained from an auxiliary
winding from the secondary of the power inductor.
When V
INEXT
rises above 0 V, the internal pre-regulator begins
charging the external capacitor on V
CC
. The charging current
is limited to typically 40 mA by the internal 100 V DMOS device.
When V
CC
exceeds the UVLO voltage of 8.8 V, a soft-start
cycle of the controller is initiated to provide power to the
secondary. Once switching commences, the internal gate
drivers for the primary side switching transistors and the drive
current into the secondary synchronization driver draw
additional current from the V
CC
capacitor and pre-regulator.
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