NCP3064 查看數據表（PDF） - ON Semiconductor
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NCP3064 Datasheet PDF : 22 Pages
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NCP3064, NCP3064B, NCV3064
Switch Collector
Switch Emitter
Timing Capacitor
GND
SOIC−8/PDIP−8
1
8
2
7
3
6
4
5
(Top View)
ON/OFF
Ipk Sense
VCC
Comparator
Inverting
Input
Figure 2. Pin Connections
DFN8
Switch Collector
ÇÇ Switch Emitter
ÇÇ Timing Capacitor
ÇÇÇÇ GND
EP Flag
ON/OFF
ÇIpk Sense
ÇVCC
ÇÇComparator
Inverting
(Top View)
Input
NOTE: EP Flag must be tied to GND Pin 4 on PCB
Figure 3. Pin Connections
8
ON/OFF
7
Ipk Sense
6
VCC
5
Comparator Inverting Input
ON/OFF
Bias
R
Q
S
Comparator
−
+
S
Q
R
0.2 V
TSD
Oscillator
Comparator
+
−
1.25 V
Reference
Regulator
Figure 4. Block Diagram
1
Switch Collector
2
Switch Emitter
CT 3
Timing Capacitor
4
GND
PIN DESCRIPTION
Pin No.
Pin Name
1
Switch Collector
2
Switch Emitter
3
Timing Capacitor
4
GND
5
Comparator
Inverting Input
6
VCC
7
Ipk Sense
8
ON/OFF
Description
Internal Darlington switch collector
Internal Darlington switch emitter
Timing Capacitor Oscillator Input, Timing Capacitor
Ground pin for all internal circuits
Inverting input pin of internal comparator
Voltage supply
Peak Current Sense Input to monitor the voltage drop across an external resistor to limit the peak
current through the circuit
ON/OFF Pin. Pulling this pin to High level turns the device in Operating. To switch into mode with
low current consumption this pin has to be in Low level or floating.
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