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PDF NJM2345 Data sheet ( Hoja de datos )
| Número de pieza | NJM2345 | |
| Descripción | PWM DC/DC Converter IC | |
| Fabricantes | JRC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJM2345 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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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
160Ω
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-
1 page  
■TIMING CHART
Error AMP
Output
Oscillator
Waveform
OSC Block to
FF, NOR
HIGH
LOW
Switch Output
ON
OFF
Ipk Sense
Output
HIGH
LOW
www.DataSheet4U.com
NJM2345
Ver.2009-10-19
-5-
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet NJM2345.PDF ] | |
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