参数资料
| 型号： | FSDM311A |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC FPS PWM/SENSFET 650V 8DIP |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 61 ~ 73kHz |
| 输入电压： | 7 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 13W |
| 工作温度： | 25°C ~ 150°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
Pin Configuration
Pin Definitions
Figure 3.
8-Lead DIP Pin Assignments (Top View)
Pin #
1
2
3
4
5
6,7,8
Name
GND
Vcc
Vfb
NC
Vstr
Drain
Description
Ground . SenseFET source terminal on primary side and internal control ground.
Positive supply voltage input . Although connected to an auxiliary transformer winding,
current is supplied from pin 5 (Vstr) via an internal switch during start-up (see the Internal Block
Diagram in Figure 2) . It is not until V CC reaches the UVLO upper threshold (9V) that the internal
start-up switch opens and device power is supplied via the auxiliary transformer winding.
Feedback . Inverting input to the PWM comparator with its normal input level lies between 0.5V
and 2.5V. It has a 0.4mA current source connected internally, while a capacitor and opto-
coupler are typically connected externally. A feedback voltage of 4.5V triggers overload
protection (OLP). There is a time delay while charging external capacitor C FB from 3V to 4.5V
using an internal 5μA current source. This time delay prevents false triggering under transient
conditions, but allows the protection mechanism to operate under true overload conditions.
No Connection .
Start-up . This pin connects directly to the rectified AC line voltage source. At start-up, the
internal switch supplies internal bias and charges an external storage capacitor placed
between the Vcc pin and ground. Once the V CC reaches 9V, the internal switch stops charging
the capacitor.
SenseFET Drain . The drain pins are designed to connect directly to the primary lead of the
transformer and are capable of switching a maximum of 650V. Minimize the length of the trace
connecting these pins to the transformer to decrease leakage inductance.
? 2007 Fairchild Semiconductor Corporation
FSDM311A ? Rev.1.0.2
3
www.fairchildsemi.com
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