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參數(shù)資料
| 型號： | L4964HT |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔離反激式開關(guān)穩(wěn)壓9V輸出 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 208K |
| 代理商： | L4964HT |
PIN FUNCTIONS
N
°
1
2
3
4
5
Name
N.C.
Output
Function
Must not be connected. Leave open circuit.
Regulator Output.
Unregulated Voltage Input. An internal regulator powers the L4964’s internal logic.
Must not be connected. Leave open circuit.
Soft Start Time Constant. A capacitor is connected between this terminal and ground
to define the soft start time constant. This capacitor also determines the average short
circuit output current.
TTL - Level Remote Inhibit. A logic high level on this input disables the L4964.
Multiple L4964’s are synchronized by connecting the pin 7 inputs together and omitting
the oscillator RC network on all but one device.
Common Ground Terminal.
A series RC network connected between this terminal and ground determines the
regulation loop gain characteristics.
The Feedback Terminal of the Regulation Loop. The output is connected directly to
this terminal for 5.1 V operation ; it is connected via a divider for higher voltages.
A parallel RC network connected to this terminal determines the switching frequency.
The pin must be connected to pin 7 input when the internal oscillator is used.
Input of the Reset Circuit. The threshold is roughly 5 V. It may be connected to the
beedback point or via a divider to the input.
A capacitor connected between this terminal and ground determines the reset signal
delay time.
Open Collector Reset Signal Output. This output is high when the supply is safe.
Must not be connected. Leave open circuit.
Supply Voltage
N.C.
Soft Start
6
7
Inhibit Input
Sync Input
8
9
Ground
Frequency
Compensation
Feedback
Input
Oscillator
10
11
12
Reset Input
13
Reset Delay
14
15
Reset Output
N.C.
BLOCK DIAGRAM
L4964
2/13
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