NCP3066 ON Semiconductor, NCP3066 Datasheet - Page 2

• Manufacturer Part Number: NCP3066
• Description: Up to 1.5A Constant Current Switching Regulator
• Manufacturer: ON Semiconductor

PIN DESCRIPTION
PDIP8
Comparator Inverting Input
Timing Capacitor
Switch Collector
1
2
3
4
5
6
7
8
Switch Emitter
Pin No.
4, EP Flag
GND
DFN8
1
2
3
5
6
7
8
Figure 2. Pin Connections
I
pk
ON/OFF
Sense
V
CC
SOIC−8/PDIP−8
2
3
4
1
Comparator Inverting Input
(Top View)
8
7
6
5
Timing Capacitor
Switch Collector
Switch Emitter
Pin Name
I
pk
ON/OFF
GND
Comparator
8
7
6
5
V
Sense
CC
ON/OFF
Bias
−
+
0.2 V
ON/OFF
I
V
Comparator
Inverting
Input
pk
CC
Figure 4. Block Diagram
Sense
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Comparator
S
R
S
R
Internal Darlington switch collector.
Internal Darlington switch emitter.
Timing Capacitor to control the switching frequency.
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. To disable the device, this input should be pulled below
0.8 V. If the pin is left floating, it will be disabled.
+
Q
−
Q
2
Reference
Regulator
Oscillator
TSD
0.235V
Timing Capacitor
Switch Collector
NOTE:
Switch Emitter
EP Flag must be tied to GND Pin 4 on PCB
Figure 3. Pin Connections
GND
Description
CT
Ç Ç Ç Ç
Ç Ç
Ç Ç
1
2
3
4
(Top View)
EP Flag
Switch Collector
Switch Emitter
Timing Capacitor
GND
DFN8
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Ç Ç
Ç
Ç
ON/OFF
I
V
Comparator
Inverting
Input
pk
CC
Sense