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BD6067GU
Datasheet
? Control by DC Voltage
BD6067GU has a built-in function for LED current control by DC voltage and can control the current by VDAC pin
control voltage.
L1
VIN
22 μ H
25
VIN
SW
VOUT
D1
1 μ F
20
BD6067GU
VFB
VFB
15
VDAC
10
GNDA GND
EN
ILED
5
DAC
0
0
0.5
1
1.5
2
2.5
R1
10 ?
Figure 13. Brightness Control by BD6067GU DAC
DAC [V] (VFB=200mV)
Figure 14. DAC Constant Current Characteristics by
DAC Control
● Over voltage Protection
BD6067GU has an over voltage protection feature. When a fault occurs, for example, IC is disconnected from LED, an
excessive voltage rise may cause the SW pin and VOUT pin to exceed the absolute maximum ratings respectively,
resulting in IC damage. For this reason, when VOUT is 30V or more, over voltage protection is activated to turn Q1 off so
that the SW pin and VOUT pin don’t exceed the absolute maximum ratings.
At this time, the IC state changes from active to inactive and the output voltage drops slowly. Then, when the output voltage
falls below the over voltage protection hysteresis level, the output voltage continues to rise up to 30V again.
This protection circuit is shown in Figure 15.
SW
D1
COUT
VOUT
Q1
Driver
OVER Detector
OVER VOLTAGE REF
Control
Figure 15. Block Diagram for Short-circuit Protection and over voltage Protection
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
8/14
TSZ02201-0G3G0C200080-1-2
5.OCT.2012 Rev.001
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