L4978 데이터 시트보기 (PDF) - STMicroelectronics
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L4978 Datasheet PDF : 13 Pages
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L4978
Table 2. Block Diagram
THERMAL
SHUTDOWN
VOLTAGES
MONITOR
2
SS_INH
INHIBIT
7
COMP
8
E/A
FB
3.3V
SOFTSTART
3.3V
INTERNAL
REFERENCE
PWM
R
Q
S
OSCILLATOR
3
OSC
1
GND
VCC
5
INTERNAL
SUPPLY 5.1V
DRIVE
CBOOT
CHARGE
6
BOOT
CBOOT
CHARGE
AT LIGHT
LOADS
4
OUT
D97IN594
Figure 3. Pins Connection (Top view)
GND
SS_INH
OSC
OUT
1
8
2
7
3
6
4
5
D97IN595
FB
COMP
BOOT
VCC
DIP-8
N.C.
GND
SS_INH
OSC
OUT
OUT
N.C.
N.C.
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
D97IN596
SO16W
N.C.
N.C.
FB
COMP
BOOT
VCC
N.C.
N.C.
Table 3. Pin Description
N°
Pin
Name
Function
1
2
GND Ground
2
3
SS_INH 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).
3
4
OSC An external resistor connected between the unregulated input voltage and this pin
and a capacitor connected from this pin to ground fix the switching frequency. (Line
feed forward is automatically obtained)
2/13
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