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NJW4160 Datasheet(PDF) 18 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) 18 Page - New Japan Radio

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NJW4160
- 18 -
Ver.2014-04-01
Application Design Examples (Continued)
Setting Oscillation Frequency
From the Oscillation frequency vs. Timing Capacitor
Characteristic, CT=470 [pF], t=3.33[ s] at fosc=300kHz.
Step-down converter duty ratio is shown with the following
equation.
%
45
100
12
4
.
0
5
100
IN
F
OUT
V
V
V
Duty
Therefore, tON=1.50 [ s], tOFF=1.83 [ s]
Fig. 10. Inductor Current Waveform
Selecting Inductance
IL is Inductance ripple current. When to IL= output current 34%:
IL = 0.34 IOUT = 0.34 3 = 1.02 [A]
This obtains inductance L. VDS_RON is drop voltage by MOSFET on resistance.
ON
L
OUT
RON
DS
IN
t
I
V
V
V
L
]
[
10
5
.
1
02
.
1
5
2
.
0
12
H
Inductance L is a theoretical value. The optimum value varies according such factors as application specifications
and components. Fine-tuning should be done on the actual device.
This obtains the peak current Ipk at switching time.
]
[
51
.
3
2
02
.
1
3
2
A
I
I
Ipk
L
OUT
The current that flows into the inductance provides sufficient margin for peak current at switching time.
In the application circuit, use L=10 H/4A.
Setting Over Current Detection
In this application, current limitation value: ILIMIT is set to Ipk=4A.
ILIMIT = VIPK / RSC = 120mV / 30m =4 [A]
The limit value increases slightly according to response time from the overcurrent detection with the SI pin to the
OUT pin stop.
]
[
12
.
4
100
10
12
0
.
4
_
A
n
T
L
V
I
I
DELAY
IN
LIMIT
DELAY
LIMIT
0
tOFF
tON
Period t
Frequency fOSC=1/t
Inductance
Current IL
Output Current IOUT
Peak Current Ipk
NJW4160 Application Manual
Technical Information


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