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參數資料
| 型號： | FSDM311L |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Green Mode Fairchild Power Switch (FPS) |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 73 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LSOP-8 |
| 文件頁數： | 3/16頁 |
| 文件大小： | 377K |
| 代理商： | FSDM311L |
FSDM311
3
Pin Definitions
Pin Configuration
Figure 3. Pin Configuration (Top View)
Pin Number
1
Pin Name
GND
Pin Function Description
Sense FET 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 8 (Vstr) via an internal
switch during startup (see Internal Block Diagram section). It is not until Vcc
reaches the UVLO upper threshold (8.7V) that the internal start-up switch
opens and device power is supplied via the auxiliary transformer winding.
The feedback voltage pin is the inverting input to the PWM comparator with
nominal input levels between 0.5Vand 2.5V. It has a 0.40mA current source
connected internally while a capacitor and opto coupler are typically
connected externally. A feedback voltage of 4.5Vtriggers overload
protection
(OLP). There is a time delay while charging between 3V and 4.5V using an
internal 5uA current source, which prevents false triggering under transient
conditions but still allows the protection mechanism to operate under true
overload conditions.
The startup pin connects directly to the rectified AC line voltage source for
FSDM311. For the FSDM311, at start up the internal switch supplies internal
bias and charges an external storage capacitor placed between the Vcc pin
and ground. Once this reaches 9V, the internal current source is disabled.
The Drain pin is designed to connect directly to the primary lead of the
transformer and is capable of switching a maximum of 650V. Minimizing the
length of the trace connecting this pin to the transformer will decrease
leakage inductance.
2
Vcc
3
Vfb
5
Vstr
6, 7, 8
Drain
1
2
3
4
5
6
7
8
GND
Vcc
Vfb
Ipk
Vstr
Drain
Drain
Drain
8DIP
8LSOP
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