NCV8843(2006) 데이터 시트보기 (PDF) - ON Semiconductor
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NCV8843 Datasheet PDF : 15 Pages
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NCV8843
PACKAGE PIN DESCRIPTION
SO−8
SO−16
1
15
2
16
3
1
4
2
5
7
6
8
7
9
8
10
−
3 − 6, 11 − 14
PIN SYMBOL
FUNCTION
BOOST
The BOOST pin provides additional drive voltage to the on−chip NPN power
transistor. The resulting decrease in switch on voltage increases efficiency.
VIN
VSW
This pin is the main power input to the IC.
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.
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.
SYNC
This pin provides the synchronization input.
GND
Power return connection for the IC.
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.
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.
NC
No Connection
PIN CONNECTIONS
1
VSW
SHDNB
NC
NC
NC
NC
SYNC
GND
16
VIN
BOOST
NC
NC
NC
NC
VC
VFB
SO−16
BOOST 1
VIN
2
VIN
3
VIN
4
Vsw 5
VSW
6
VSW
7
SHDNB 8
NC 9
18 NC
17 VC
16
VFB
15 NC
14 NC
13 GND
12 NC
11 NC
10 SYNC
18−Lead DFN
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