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参数资料
| 型号： | SIP11205DLP-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 8/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM MLP44-16 |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 10.5 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： | PowerPAK? MLP44-16 |
| 包装： | 带卷 (TR) |
SiP11205
Product is End of Life 3/2014
Vishay Siliconix
FEED-FORWARD FUNCTION DIAGRAM
V ROSC = V INDET /2 = 3.75 V
V COSC high line voltage
V RDB = 1.89 V
V COSC low line voltage
2 V BE
D = 90 %
DL/DH
CIRCUIT FOR FREQUENCY SYNCHRONIZATION
D = 45 %
220 pF
100
2N3904
SYNC IN
1k
DETAILED OPERATIONAL DESCRIPTION
Start Up
C OSC
SiP11205
The controller supply (V CC ) is linearly regulated up to its
target voltage V REG by the on chip pre-regulator circuit.
During power up with V INDET ramping up from GND, the V CC
capacitor minimum charge current is 20 mA and the
pre-regulator voltage is typically 9.3 V. As V INDET exceeds
V REF , the DL/DH outputs are capable of driving 3 nF
MOSFET gate capacitances and hence the pre-regulator
load regulation can easily handle 120 μA to 20 mA load step
with a typical load regulation of 1 %. Startup current into the
external V CC capacitor is limited to typically 20 mA by the
internal N-Channel DMOS in the pre-regulator unless an
external power source is connected to V CC pin. This source
may be a DC supply or from external V IN by connecting a
PNP pass transistor between V IN and V CC . The V CC pin is
protected by a 20 mA clamp when this pin exceeds 14.5 V.
The clamp turns on when V CC is between 14.5 and 16 V.
When V CC exceeds the UVLO voltage (UVLO H ) 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 UVLO H and V REG ,
excessive load may result in V CC falling below UVLO H and
www.vishay.com
8
stopping switch mode operation. This situation is avoided by
the hysteresis between V REG and UVLO Off-Threshold level
UVLO L .
PWM Operation
During startup, DL always turns on before DH and both
switch on and off at half the oscillator frequency. The SS
comparator compares the SS ramp with the oscillator ramp
hence the duty cycle increases as V SS increases. When SS
ramp reaches a voltage that equals to R DB voltage, the PWM
comparator, which compares R DB voltage to the oscillator
ramp, takes over and the maximum duty cycle is now set by
the oscillator ramp and R DB voltage. Refer to "Timing
diagram and soft start duty cycle control" graph for better
understanding. After soft start completion the duty cycle is
modulated by the feed-forward voltage V FF = V ROSC =
V INDET /2. Since the oscillator frequency is fixed, the ramp
amplitude must increase to reduce the duty cycle set by R DB .
Mathematically, the total duty cycle is determined by the
following formula:
D TOTAL =
V RDB /(V INDET /2) = 2 x V REF x R DB1 /(R DB1 + R DB2 )/V INDET
Document Number: 69233
S-81795-Rev. C, 04-Aug-08
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相关代理商/技术参数 |
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| SIP11205DQP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Feed-Fwd Controller with MOSFET Drivers 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 |
| SIP11206 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:Half-Bridge Controller with Primary MOSFET Drivers for Intermediate Bus Converters |
| SIP11206DLP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Half-Bridge with MOSFET Drivers 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 |
| SIP11206DQP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Half-Bridge with MOSFET Drivers 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 |
| SIP115 | 制造商:Power-One 功能描述: |
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