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NJW4160 Datasheet(PDF) 9 Page - New Japan Radio

Part No. NJW4160
Description  Switching Regulator IC for Buck Converter
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Manufacturer  NJRC [New Japan Radio]
Direct Link  http://www.njr.co.jp/index_e.htm
Logo NJRC - New Japan Radio

NJW4160 Datasheet(HTML) 9 Page - New Japan Radio

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NJW4160
- 9 -
Ver.2014-04-01
Description of Block Features
Error Amplifier Section (ER AMP)
0.8V±1% precise reference voltage is connected to the non-inverted input of this section.
To set the output voltage, connects converter's output to inverted input of this section (IN- pin). If requires output
voltage over 0.8V, inserts resistor divider.
This AMP section has high gain and external feedback pin (FB pin). It is easy to insert a feedback resistor and a
capacitor between the FB pin and the IN- pin, making possible to set optimum loop compensation for each type of
application.
Oscillation Circuit Section (OSC)
Oscillation frequency can be set by inserting capacitor between the CT pin and GND. Referring to the sample
characteristics in "Timing Capacitor and Oscillation Frequency", set oscillation frequency between 50kHz and 1MHz.
The triangular wave of the oscillating circuit is generated in the IC, having amplitude between 0.4V and 1.0V at
CT=470pF(ref.).
If voltage of the IN- pin becomes less than 0.3V, the oscillation frequency decreases to one third (33%) and the
energy consumption is suppressed.
10
100
1000
10
100
1000
10000
Oscillation frequency vs.Timing Capacitor
(V
+=12V, Ta=25oC)
Timing Capacitor C
T
(pF)
PWM Comparator Section (PWM)
This section controls the switching duty ratio.
PWM comparator receives the signal of the error amplifier and the triangular wave, and controls the duty ratio
between 0% and 100%. The timing chart is shown in Fig.1.
OUT pin
FB pin Voltage
High
Low
GND
OSC
Waveform
1.0V
0.4V
Fig. 1. Timing Chart PWM Comparator and OUT pin
NJW4160 Application Manual
Technical Information


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