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JRC - PWM DC/DC Converter IC

Numéro de référence NJM2345
Description PWM DC/DC Converter IC
Fabricant JRC 
Logo JRC 





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NJM2345 fiche technique
NJM2345
PWM DC/DC Converter IC with Standby Function
GENERAL DESCRIPTION
The NJM2345 is a step down PWM DC/DC converter IC.
An internal 1.5A power transistor, a pulse-by pulse current limit
circuit and a 1% precision reference make the NJM2345 suitable
for a wide range of voltage converter needs.
The NJM2345 features a standby function that can be used for
both power saving and safety operation.
PACKAGE OUTLINE
NJM2345D
NJM2345M
FEATURES
Operating Voltage
Wide Oscillator Frequency
Maximum duty ratio
Precision Reference Voltage
Internal High Power Transistor
Internal Over Current Limit Circuit
PWM switching control
Standby Function
Bipolar Technology
Package Outline NJM2345D
NJM2345M
3.0V to 40V
1kHz to 150kHz
100%
Vth=1.25V ± 1%
1.5A max.
9µA typ.
: DIP8
: DMP8
PIN CONFIGURATION
BLOCK DIAGRAM
www.DataSheet4U.com
1
2
3
4
NJM2345D
NJM2345M
8 PIN FUNCTION CS 1
1. CS
7 2. ES
3. CT
1.5A
6 4. GND
160
5. IN-
5 6. V+
ES 2
7. ON/OFF
8. SI
OSC Block
MAX Duty
=100%
QR
PWM
Logic
S
Ipk Sense
300mV
8 SI
7 ON/OFF
High :ON
Low :OFF (Standby)
CT 3
Vref
1.25V
Error AMP
6 V+
PWM COMP
GND 4
Buffer
5 IN-
Ver.2009-10-19
-1-

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