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NCP1597B
BLOCK DIAGRAM
NCP1597B
VCCP
VCC
+
CA
EN
Power Reset
UVLO
THD
Hiccup
+
OSC
?
Soft ? Start
PMOS
M1
LX
PWM
FB
Vref
+
+ gm
?
?
+
Control
Logic
LX
AGND
PGND
Figure 1. Block Diagram
PIN DESCRIPTIONS
Pin No
1
2
3
4
5
6
7, 8
9, 10
EP
Symbol
EN
V CC
V CCP
AGND
FB
NC
LX
PGND
PAD
Description
Logic input to enable the part. Logic high turns on the part and a logic low disables it. An internal pullup
forces the part into an enable state when no external bias is present on the pin.
Input supply pin for internal bias circuitry. A 0.1 m F ceramic bypass capacitor is preferred to connect to
this pin.
Power input for the power stage
Analog ground pin. Connect to thermal pad.
Feedback input pin of the Error Amplifier. Connect a resistor divider from the converter ’s output voltage
to this pin to set the converter ’s output voltage.
No connection
The drains of the internal MOSFETs. The output inductor should be connected to these pins.
Power ground pins. Connect to thermal pad.
Exposed pad of the package provides both electrical contact to the ground and good thermal contact to
the PCB. This pad must be soldered to the PCB for proper operation.
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