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參數(shù)資料
| 型號(hào)： | L4978D |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)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)： | 2/12頁 |
| 文件大?。?/td> | 135K |
| 代理商： | L4978D |
PIN FUNCTIONS
DIP
1
2
SO (*)
2
3
Name
GND
SS_INH
Function
Ground
A logic signal (active low) disables the device (sleep mode operation).
A capacitor connected between this pin and ground determines the soft start time.
When this pin is grounded disables the device (driven by open collector/drain).
An external resistor connected between the unregulated input voltage and this pin and
a capacitor connected from this pin to groundfix the switching frequency. (Line feed
forward is automatically obtained)
Stepdown regulator output
Unregulated DC inputvoltage
A capacitor connected between this pin and OUT allows to drive the internal DMOS
Transistors
E/A output to be used for frequency compensation
Stepdown feedback input. Connecting directly to this pin results in an output voltage of
3.3V. An external resistive divider is required for higher output voltages.
3
4
OSC
4
5
6
5, 6
11
12
OUT
V
CC
BOOT
7
8
13
14
COMP
FB
(*) Pins 1, 7,8, 9, 10, 15 and 16 are not internally, electrically connected to the die.
PIN CONNECTIONS
GND
SS_INH
OSC
OUT
1
3
2
4
VCC
BOOT
COMP
FB
8
7
6
5
D97IN595
N.C.
GND
SS_INH
OSC
OUT
N.C.
OUT
N.C.
N.C.
N.C.
BOOT
VCC
COMP
FB
N.C.
N.C.
1
3
2
4
5
6
7
8
14
13
12
11
10
9
15
16
D97IN596
INHIBIT
SOFTSTART
VOLTAGES
MONITOR
THERMAL
SHUTDOWN
E/A
PWM
3.3V
OSCILLATOR
R
S
Q
INTERNAL
REFERENCE
INTERNAL
SUPPLY
3.3V
5.1V
DRIVE
CBOOT
CHARGE
CBOOT
CHARGE
AT LIGHT
LOADS
2
7
8
FB
COMP
SS_INH
3
1
4
6
5
BOOT
OSC
GND
OUT
VCC
D97IN594
BLOCKDIAGRAM
Minidip
SO16W
L4978
2/12
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