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L4978 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - 2A STEP DOWN SWITCHING REGULATOR - STMicroelectronics

भाग संख्या L4978
समारोह 2A STEP DOWN SWITCHING REGULATOR
मैन्युफैक्चरर्स STMicroelectronics 
लोगो STMicroelectronics लोगो 
पूर्व दर्शन
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L4978 pdf
L4978
Table 2. Block Diagram
THERMAL
SHUTDOWN
VOLTAGES
MONITOR
2
SS_INH
INHIBIT
COMP
FB
7
8
E/A
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
18
27
36
45
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
89
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

विन्यास 13 पेज
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