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ZXSC380
Application notes
Typical application circuit
Figure 2 shows a typical boost circuit for 18mA LED current from a single cell 1.5V supply. The
inductor value is 100 H. The operating frequency is typically 160kHz typical for 1.5V supply.
V IN
1
V CC
L1
100uH
ZXSC380
V OUT 2
GND
3
LED1
GND
Figure 2 Typical application circuit
The LED current can be set by the choice of inductor values described below.
Inductor selection and current setting
Figure 3 shows the LED current vs the supply voltage while Figure 4 shows the switching
frequency vs the supply voltage for various inductor values. Figure 3 and 4 can be used as guides
to the inductor value selection. The inductor should have a low DC resistance for high efficiency.
The switching frequency is dependent on the programmed peak current, the input voltage, the
input to output voltage differential and the inductor value.
LED Current vs Supply Voltage
for L = 22, 47, 68 & 100uH
20
18
16
14
12
10
8
6
4
2
0
1
1.1
1.2
1.3
1.4
1.5
Supply Voltage Vvcc (V)
L = 100uH
L = 68uH
L = 47uH
L = 22uH
Figure 3 The LED current vs the supply voltage for various inductor values
Issue 3 - September 2007
? Zetex Semiconductors plc 2007
6
www.zetex.com
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相关PDF资料
ZXSC400E6TA
IC LED DRVR WHITE BCKLGT SOT23-6
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