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参数资料
| 型号： | SI9122DQ-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM VM 20-TSSOP |
| 标准包装： | 3,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 750kHz |
| 占空比： | 95% |
| 电源电压： | 10 V ~ 13.2 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
Si9122
Vishay Siliconix
V CC
V I N
Pre-Reg u lator
V REF
Bandgap
Reference
V REG
9.1 V
+
-
9.1 V
3.3 V
V I N DET
C L_CO N T
+
-
V REF
V U V
V U V LO
+
-
8 . 8 V
High-Side
Primary
Dri v er
+
V SD
BST
R OSC
V oltage
Feedfor w ard
OSC
Fre qu ency
Fold b ack
-
550 m V
V SD
160 °C Temp
Protection
V U V V U V LO
High V oltage
Interface
D H
L X
Oscillator
60 k Ω
132 k Ω
Clock
Clock
Logic
OTP
V CC
Lo w -Side
Dri v er
D L
EP
-
+
V REF /2
?
+
P W M
Logic
PG N D
Generator
CS2
CS1
C u rrent
Control
+
-
Gain
Loop
Control
Timer
V CC
Synchrono u s
Dri v er
(High)
100 m V
Blanking
SR H
C L_CO N T
SS
8V
V CC
20 μA
Soft-Start
G N D
BBM
Si9122
V CC
Synchrono u s
Dri v er
(Lo w )
SR L
SS Ena b le
Figure 4. Detailed Functional Block
DETAILED OPERATION
Start-Up
When V INEXT rises above 0 V, the internal pre-regulator
begins to charge up the V CC 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
Document Number: 71815
S-80038-Rev. J, 14-Jan-08
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
V CC 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.
www.vishay.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9122E | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers |
| SI9122EDLP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SI9122EDQ-T1-E3 | 功能描述:开关变换器、稳压器与控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SI9123 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| SI9124 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
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