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參數資料
| 型號： | SI9122A |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | 500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers |
| 中文描述： | 500千赫半橋DC / DC變換器與集成的次級同步整流驅動器控制器 |
| 文件頁數： | 8/15頁 |
| 文件大?。?/td> | 241K |
| 代理商： | SI9122A |
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
EP
+
–
Bandgap
Reference
3.3 V
Voltage
Feedforward
Frequency
Foldback
OSC
Loop
Control
160 C Temp
Protection
High Voltage
Interface
V
SD
V
UV
V
UVLO
Logic
Clock
OTP
V
REF
V
INDET
–
+
C
L_CONT
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
SR
H
SR
L
PGND
Low-Side
Driver
Synchronous
Driver
(High)
Synchronous
Driver
(Low)
GND
BBM
Current
Control
Gain
100 mV
CS2
CS1
Blanking
C
L_CONT
V
CC
20 A
Soft-Start
SS Enable
SS
Si9122A
8 V
–
+
–
+
V
REG
9.1 V
V
CC
V
IN
Pre-Regulator
V
UVLO
8.6 V
9.1 V
V
CC
V
CC
V
CC
Start-Up
When V
INEXT
rises above 0 V, the internal pre-regulator begins
to charge up the Vcc capacitor. Current into the external V
CC
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 V
CC
supply continues to be charged by the pre-regulator until V
CC
equals V
REG
. During this period, between V
UVLO
and V
REG
,
excessive load current will result in V
CC
falling below V
UVLO
and stopping switch mode operation. This situation is avoided
by the hysteresis between V
REG
and V
UVLO
and correct sizing
of the V
CC
capacitor, bootstrap capacitor and the soft-start
capacitor. The value of the V
CC
capacitor should therefore be
chosen to be capable of maintaining switch mode operation
until the required V
CC
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 V
CC
above V
REG
and fully disconnects the
pre-regulator, isolating V
CC
from V
IN
. V
CC
is then maintained
above V
REG
for the duration of switch mode operation. In the
event of an over voltage condition on V
CC
, an internal voltage
clamp turns on at 14.5 V to shunt excessive current to GND.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SI9122A_08 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers |
| SI9122ADLP-T1-E3 | 功能描述:開關變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9122ADQ-T1-E3 | 功能描述:DC/DC 開關控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| SI9122DLP-T1-E3 | 功能描述:開關變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9122DQ | 功能描述:開關變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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