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NCV8843 데이터시트(Datasheet) 3 Page - ON Semiconductor

부품명 NCV8843
상세내용  1.5 A, 340 kHz, Buck Regulator with Synchronization Capability
PDF  15 Pages
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제조사  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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NCV8843
http://onsemi.com
3
PACKAGE PIN DESCRIPTION
SO−8
SO−16
PIN SYMBOL
FUNCTION
1
15
BOOST
The BOOST pin provides additional drive voltage to the on−chip NPN power
transistor. The resulting decrease in switch on voltage increases efficiency.
2
16
VIN
This pin is the main power input to the IC.
3
1
VSW
This is the connection to the emitter of the on−chip NPN power transistor and
serves as the switch output to the inductor. This pin may be subjected to nega-
tive voltages during switch off−time. A catch diode is required to clamp the pin
voltage in normal operation. This node can stand −1.0 V for less than 50 ns
during switch node flyback.
4
2
SHDNB
The shutdown pin is active low and TTL compatible. The IC goes into sleep
mode, drawing less than 1.0
mA when the pin voltage is pulled below 1.0 V.
This pin should be left floating in normal position.
5
7
SYNC
This pin provides the synchronization input.
6
8
GND
Power return connection for the IC.
7
9
VFB
The FB pin provides input to the inverting input of the error amplifier. If VFB is
lower than 0.29 V, the oscillator frequency is divided by four, and current limit
folds back to about 1 A. These features protect the IC under severe overcurrent
or short circuit conditions.
8
10
VC
The VC pin provides a connection point to the output of the error amplifier and
input to the PWM comparator. Driving of this pin should be avoided because
on−chip test circuitry becomes active whenever current exceeding 0.5 mA is
forced into the IC.
3 − 6, 11 − 14
NC
No Connection
PIN CONNECTIONS
1
16
VFB
GND
VC
SYNC
NC
NC
NC
NC
NC
NC
NC
NC
BOOST
SHDNB
VIN
VSW
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
BOOST
VIN
VIN
VIN
Vsw
VSW
VSW
SHDNB
NC
NC
VC
VFB
NC
NC
GND
NC
NC
SYNC
SO−16
18−Lead DFN




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