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PDF NJM2811 Data sheet ( Hoja de datos )
| Número de pieza | NJM2811 | |
| Descripción | 7.5A High Power DC/DC Converter Controller IC | |
| Fabricantes | JRC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJM2811 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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NJM2811
7.5A High Power DC/DC Converter Controller IC
■GENERAL DESCRIPTION
The NJM2811 is a high power step down DC/DC converter IC.
It incorporates 7.5A power transistor, ±2% accuracy precision
voltage reference, fixed frequency PWM controller with
cycle-by-cycle current limit and low power consumption stand by
function.
The NJM2811 realizes a high power step down application with
minimal external components.
■PACKAGE OUTLINE
PIN FUNCTION
1:VFB
2:SWOUT
3:GND
4:V+
5:STBY (VCOMP)
■FEATURES
● Adjustable output voltage
more than 5V
● Operating Voltage
7.5V to 40V
● PWM form Switching Power Supply Control
● Internal High Power Transistor 7.5A (min.)
● Fixed Frequency Oscillator
72kHz (typ.)
● Current Sense Amplifier
● Under Voltage Lockout
● Thermal Shutdown Circuit
● Bipolar Technology
● Package Outline
TO-220(5PIN)
NJM2811TLA2050
Pin 1 locates on the left side of the package drawing
(top front view).
■BLOCK DIAGRAM
7.5A Power Transistor
4
Current Sense
Amplifier
Current Detection
Transistor
Thermal
Shutdown
Reference
Voltage
Oscillator
SQ
ON/OFF VREF
Under Voltage
Lockout
Standby Circuit
PWM Comparator
R
Latch Circuit
Error Amplifier
VREF
53
2
1
-1-
1 page  
NJM2811
■TYPICAL CHARACTERISTICS
Voltage Feedback Input Threshold vs. Temperature
(V+=12V)
5.1
Error AMP Block Input Bias Current vs. Temperature
(V+=12V, V =V (th)+0.15V)
0.4 FB FB
5.05 0.3
5 0.2
4.95 0.1
4.9
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Oscillator Frequency vs. Temperature
80 (V+=12V)
75
70
65
60
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Under Voltage Lockout Threshold
8 vs. Temperature
7.5
Startup Threshold
7 V+ Increasing
6.5
6 Startup Threshold
V+ Decreasing
5.5
5
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
0
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Current Limit Threshold vs. Temperature
10 (V+=15V)
9
8
7
6
5
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (oC)
Operating-State Power Supply Current
vs. Tmperature
60 (V+=40V, VFB=0V, duty cycle=MAX)
50
40
30
20
10
0
-50 -25 0 25 50 75 100 125 150
Ambient Tmperature Ta (oC)
-5-
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NJM2811.PDF ] | |
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