NCP3163 データシートの表示（PDF） - ON Semiconductor
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NCP3163 Datasheet PDF : 20 Pages
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NCP3163, NCV3163
IPKsense
RSC
VCC
Timing Capacitor
CT
Shutdown
RDT
Gnd
Voltage Feedback 1
Voltage Feedback 2
LVI Output
0.25 V Current
8
- Limit
+
7
VCC
6 Oscillator
9 Driver Collector
10
Switch Collector
Q1 11
5
Thermal
4
R
Q
S
Latch
VCC
Q2
12
60
13
3
14
45 k
2.0 mA
Switch Emitter
2
1
+
+
-
LVI
+
+
Feedback
- Comparator
1.25 V 15 k
7.0 V
1.125 V
VCC
(Bottom View)
15
16 Bootstrap Input
+
= Sink Only
-
Positive True Logic
Figure 2. Representative Block Diagram
PIN FUNCTION DESCRIPTION
SOIC16
DFN18
PIN NAME
1
15
LVI Output
2
16
Voltage Feedback 2
3
17
Voltage Feedback 1
4
18
GND
6
1
Timing Capacitor
7
8
9
10,11
14,15
16
3
4
5
6,7,8,9
10,11,12,13
14
VCC
Ipk Sense
Drive Collector
Switch Collector
Switch Emitter
Bootstrap Input
5,12,13
Exposed
Pad
2
Exposed
Pad
No Connect
Exposed Pad
DESCRIPTION
This pin will sink current when FB1 and FB2 are less than the LVI threshold (Vth).
Connecting this pin to a resistor divider off of the output will regulate the application
according to the Vout design equation in Figure 22.
Connecting this pin directly to the output will regulate the device to 5.05 V.
Ground pin for all internal circuits and power switch.
Connect a capacitor to this pin to set the frequency. The addition of a parallel resist-
or will decrease the maximum duty cycle and increase the frequency.
Power pin for the IC.
When (VCC−VIPKsense) > 250 mV the circuit resets the output driver on a pulse by
pulse basis.
Voltage driver collector
Internal switch transistor collector
Internal switch transistor emitter
Connect this pin to VCC for operation at low VCC levels. For some topologies, a
series resistor and capacitor can be utilized to improve the converter efficiency.
These pins have no connection.
The exposed pad beneath the package must be connected to GND (pin 4). Addi-
tionally, using proper layout techniques, the exposed pad can greatly enhance the
power dissipation capabilities of the NCP3163.
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