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参数资料
| 型号： | SG6105ADY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY SUPERVISOR 20DIP |
| 标准包装： | 22 |
| 应用： | 电源，监控器 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 5mA |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 20-DIP |
| 包装： | 管件 |
Application Information
Introduction
The application guide shows the key features of
SG6105A and illustrates how to design in an ATX
switching mode power supply (SMPS). SG6105A is
suitable for half-bridge, push-pull topology and
incorporates with a four-channel supervisor, including
5V-standby. The PWM section of SG6105A comprises
a built-in 65kHz oscillator and high-immunity circuits,
which protect the system from noise interference and
provide more noise margins for improper PCB layout.
V DD
OP1
OP2
SG6105A has OVP and UVP for 12V, 5V, and 3.3V.
NVP is used for negative voltage protection, such as –
12V and/or –5V. The U VAC (AC fails detection) is applied
to detect AC line condition. Two built-in internal
R 1
R 2
C 1
R 3
OPP
precision TL431 shunt regulators can be used for 3.3V
or 5V auxiliary standby power.
AC Fails Detection
Through a resistor divider, U VAC is connected to the
secondary power transformer for detecting the AC line
condition. Once the voltage of U VAC is lower than 0.7V
for a period of time, such as 200μs, the PG (power-
good) signal is pulled low to indicate an AC line power-
down condition. The voltage amplitude of the PWM
switching signal in the secondary power transformer is
proportional to the AC line voltage. Adjust the ratio of
resistor divider to decide the threshold of power-down
warning. A small capacitor is connected from U VAC to
ground for filtering the switching noise.
Figure 18. OPP Protection Circuit
Negative Voltage Protection (NVP)
The NVP provides an under-voltage protection (UVP)
for negative voltage outputs. An under-voltage
represents the phenomenal of the overload condition in
negative voltage output. For example, the –12V output
may drop to –10V during the overload situation. A
resistor determining the threshold of the protection is
connected from pin NVP to the negative voltage output.
Via this resistor, NVP outputs a 64μA constant current
to the negative voltage output. When the NVP voltage is
over 2.1V and the situation kept for longer than 7ms,
V S
V O
SG6105A locks the power outputs off:
V NVP =64μA × (R1 + R2) – V-12V
(1)
The power outputs are locked off when VNVP ≥ 2.1V.
R 1
R 2
0.7V
C 1
UVAC
Figure 19. NVP Protection Circuit
Figure 17. AC Detection Circuit
Over-Power Protection (OPP)
The OPP is used for detecting over-power and/or short-
circuit conditions. When OPPS voltage (p.4, Note-1) is
higher than 2.1V and this situation exists for longer than
7ms, SG6105A pulls the PG low and locks off the power
outputs.
? 2008 Fairchild Semiconductor Corporation
SG6105A ? Rev. 1.0.2
12
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SG6105ADZ | 功能描述:监控电路 Power Supply Sprvsr + Regulator + PWM RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| SG6105ADZ_F116 | 功能描述:监控电路 Power Supply Sprvsr Regulator + PWM RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| SG6105D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Supply Supervisor + Regulator + PWM |
| SG6105D1 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SG6105DZ | 制造商:FAIRCHILD 功能描述:Power Supply Supervisor + Regulator + PWM(20-DIP) D version |
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