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PDF NJM2393 Data sheet ( Hoja de datos )
| Número de pieza | NJM2393 | |
| Descripción | Step-Down PWM DC/DC Converter IC | |
| Fabricantes | JRC | |
| Logotipo |  |
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NJM2393
Step-Down PWM DC/DC Converter IC
■GENERAL DESCRIPTION
The NJM2393 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 NJM2393
suitable for a wide range of step down applications.
The NJM2393 features 100% maximum duty cycle for low
voltage drop operation.
■PACKAGE OUTLINE
NJM2393D
NJM2393M
■FEATURES
•Operating Voltage
•Wide Oscillator Frequency
•Precision Reference Voltage
•Internal High Power Transistor
•Maximum duty ratio
•Internal Over Current Limit Circuit
•PWM switching control
•Bipolar Technology
•Package Outline NJM2393D
NJM2393M
3.0V~40V
1kHz~150kHz
Vth=1.25V ± 1%
1.5A max.
100%
: DIP8
: DMP8
■PIN CONFIGURATION
■BLOCK DIAGRAM
1
ww2w.DataSheet4U.com
3
4
NJM2393D
NJM2393M
8 PIN FUNCTION
1. CS
7 2. ES
3. CT
6 4. GND
5. IN-
5 6. V+
7. SI
8. CD
CS 1
1.5A
ES 2
160Ω
QR
PW M
Logic
S
8 CD
7 SI
CT 3
OSC Block
MAX Duty
=100%
Vref
1.25V
Error AMP
Ipk Sense
300mV
PWM COMP
6 V+
GND 4
Buffer
5 IN-
Ver.2009-09-28
-1-
1 page  
NJM2393
■TYPICAL CHARACTERISTICS
Oscillator Frequency vs. Timing Capacitor
(V+=5V, S =V+, Pin 5=GND, Ta=25oC)
I
100
10
1
10 100 1000 10000 100000
Timing Capacitor CT (pF)
Saturation Voltage 1 vs. Collector Current
1.4 (V+=5V, CS=CD, Ta=25oC)
1.2
1
0.8
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Collector CurrentIC (A)
Saturation Voltage 2 vs. Collector Current
1.4 (V+=5V, Ic(driver)=50mA,β≅14, Ta=25oC)
1.2
1
0.8
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
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Collector Current IC (A)
Saturation Voltage 3 vs. Collector Current
0.1 (V+=5V, Ic(driver)=5mA,Ta=25oC)
0.08
0.06
0.04
0.02
0
0 5 10 15 20
Collector Current IC (mA)
Input Bias Current vs. IN- Terminal Voltage
(V+=5V, Ta=25oC)
500
400
300
200
100
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
IN- Terminal Voltage (V)
Operating Current vs. Operating Voltage
4(CT=1nF, SI=V+, IN->Vth, Es=GND, Ta=25oC)
3
2
1
0
0 10 20 30 40
Operating Voltage V+ (V)
Ver.2009-09-28
-5-
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NJM2393.PDF ] | |
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