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| 型号： | SG1577ASY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 20-SOIC |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 372kHz |
| 占空比： | 95% |
| 电源电压： | 10 V ~ 15 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
August 2010
SG1577A
Dual Synchronous DC/DC Controller
Features
Integrated Two Sets of MOSFET Drivers
Two Independent PWM Controllers
Constant Frequency Operation: Free-Running
Fixed Frequency Oscillator Programmable:
61kHz to 340kHz
Maximum Input Supply Voltage: 15V
Programmable Output as Low as 0.7V
Internal Error Amplifier Reference Voltage:
0.7V±1.5%
Two Soft-Start / EN Functions
Programmable Over-Current Protection (OCP)
30V HIGH Voltage Pin for Bootstrap Voltage
Output Over-Voltage Protection (OVP)
20-Pin SOP
Applications
CPU and GPU Vcore Power Supply
Power Supply Requiring Two Independent Outputs
Ordering Information
Description
The SG1577A is a high-efficiency, voltage-mode, dual-
channel, synchronous DC/DC PWM controller for two
independent outputs. The two channels are operated
out of phase. The internal reference voltage is trimmed
to 0.7V±1.5%. It is connected to the error amplifier’s
positive terminal for voltage feedback regulation.
The soft-start circuit ensures the output voltage can be
gradually and smoothly increased from zero to its final
regulated value. The soft-start pin can also be used for
chip-enable function. When two soft-start pins are
grounded, the chip is disabled and the total operation
current can be reduced to under 0.7mA.
The fixed-frequency is programmable from 60kHz to
340kHz. The Over-Current Protection (OCP) level can
be programmed by an external current-sense resistor. It
has two integrated sets of internal MOSFET drivers.
SG1577A is available in a 20-pin SOP package.
Part Number
SG1577ASY
Operating Temperature Range
-40°C to +105°C
Package
20-Lead, Small Outline Package
(SOP-20)
Packing Method
Tape & Reel
? 2009 Fairchild Semiconductor Corporation
SG1577A ? Rev. 1.0.2
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG1577DY | 功能描述:电压模式 PWM 控制器 DUAL-SYNCHRONUOS DC/DC CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SG1577DZ | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual Synchronous DC/DC Controller |
| SG1577SY | 功能描述:DC/DC 开关控制器 Dual Sync DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SG1577SY_12 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual Synchronous DC/DC Controller |
| SG1577SZ | 功能描述:DC/DC 开关控制器 Dual Synchronous DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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