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BD6067GU
Datasheet
● Release Circuit Protection
1) Operation
BD6067GU is a constant frequency PWM current mode DC/DC converter. It is shown in the block diagram of Page 3 In a
PWM comparator forming one of the PWM current mode features, one is an error element from the error amplifier and
another is an element produced by superimposing the inductor current on a slope waveform that prevents sub-harmonic
oscillation. This output controls Q1 via the RS latch. Energy is stored in an external inductor whileQ1 is ON and then it is
moved to the COUT capacitor via D1 while Q1 is OFF. In this way, voltage VOUT higher than input voltage VIN can be
obtained. Because the above operation is performed in a way that the VFB pin voltage equals the VFB voltage, the boost
voltage is dominantly determined by the expression “Vf × number of LEDs.”
VOUT voltage = (Vf × number of LEDs) + VFB
2) LED current control
The LED current is determined depending on the VFB pin voltage “VFB” and the resistance connected to VFB.
ILED is given below.
ILED =200mV/ R1
ILED [mA]
5
10
12
15
20
BD6067GU
39
20
16
13
10
R1 [ ? ]
3) Dimming control
? Control by PWM signal
The startup condition of BD6067GU is controlled via the EN pin. It is powered OFF at 0.4V or less and powered ON at
1.4V or more.
As shown in Figure 12, brightness is controlled in the BD6067GU via the PWM signal input the EN pin. In this way, the
LED current is controlled in a range from 0 to the maximum current. The average LED current increases in proportion
to the Duty cycle of the PWM signal. In the PWM off cycle, no current dissipation takes place in IC and LEDs, resulting
in high efficiency. Duties below 5% and above 95% must no be used for brightness control because they significantly
affects the leading and trailing edges. BD6067GU standard PWM frequency ranges from 100Hz to 300Hz.
L1
22 μ H
VIN
VIN
SW
D1
VOUT
1 μ F
BD6067GU
VFB
VDAC
ILED
GNDA GND
EN
PWM
100Hz~300Hz
R1
10 ?
Figure 12. Example of Brightness Control by PWM signal at the EN Pin
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
7/14
TSZ02201-0G3G0C200080-1-2
5.OCT.2012 Rev.001
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