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NCP3101 Datasheet(PDF) 2 Page - ON Semiconductor

Part # NCP3101
Description  Wide Input Voltage Synchronous Buck Converter
Download  18 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP3101 Datasheet(HTML) 2 Page - ON Semiconductor

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NCP3101
http://onsemi.com
2
Figure 2. Detailed Block Diagram
-
+
-
+
-
+
-
+
-
+
-
+
13
24
21
25
26-37
VCC
BST
TGOUT
TGIN
PWRVCC
16
17
FB
COMP
DIS
1-4
36-40
22
PWRPHS
CPHS
14,15,19,20,23
35
5-12
AGND
BG
PWRGND
R
S
Q
PWM
OUT
LATCH
OSC
OSC
RAMP
CLOCK
POR
UVLO
0.8V
0.4V
50mV-550mV
VOCTH
FAULT
VCC
FAULT
FAULT
2V
VOCTH
SET
2V
10
mA
Vref
CPHS
FAULT
PIN FUNCTION DESCRIPTION
Pin No
Symbol
Description
1-4 , 36-40
PWRPHS
Power phase node. Drain of the low side power MOSFET and source of the high side
MOSFET.
5-12
PWRGND
Power ground. Source of the low side power MOSFET. Connected with large copper
area. High current return for the low side MOSFET.
13
VCC
Supply for the internal driver. Decouple with a 0.1
mF - 1 mF capacitor to AGND as close
to the IC as possible.
14,15,19,20,23
AGND
Internal driver ground. Reference ground for FB, COMP and other driver circuits.
16
FB
The input pin to the error amplifier.(inverted input error amplifier) Connect this pin to the
output resistor divider (if used) or directly to the output voltage near the load connection.
17
COMP/DIS
Compensation or disable pin. (output error amplifier) Use this pin to compensate the
voltage control feedback loop. The compensation capacitor also acts as a soft-start
capacitor. Pulling the pin below 400 mV will disable the controller.
18
NC
No connect. This pin can be connected to AGND or not connected.
21
TGOUT
Output high side MOSFET driver. Connect to pin 25 with compensation circuit if used.
22
CPHS
The controller phase sensing.
24
BST
Supply rail for the floating top gate driver.
25
TGIN
Gate high side MOSFET
26-34
PWRVCC
Input supply pins for the high side MOSFET. (Drain)
35
BG
The current limit set pin.


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