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BD8119FM-M
8. Setting of the over-voltage protection
Vo
Technical Note
We recommend setting the over-voltage protection Vovp
1.2V to 1.5V greater than Vout which is adjusted by the
number of LEDs in series connection. Less than 1.2V may
cause unexpected detection of the LED open and short during
the PWM brightness control. For the Vovp greater than 1.5V,
the LED short detection may become invalid.
ROVP2
ROVP1
OVP
－
＋
2.0V/1.45V
－
＋
1.7V/1.6V
9. Setting of the soft-start
The soft-start allows minimization of the coil current as well as the overshoot of the output voltage at the start-up.
For the capacitance we recommend in the range of 0.001 ? 0.1μF. For the capacitance less than 0.001μF may cause
overshoot of the output voltage. For the capacitance greater than 0.1μF may cause massive reverse current through the
parasitic elements of the IC and damage the whole device. In case it is necessary to use the capacitance greater than
0.1μF, ensure to have a reverse current protection diode at the Vcc or a bypass diode placed between the SS-pin and
the Vcc.
Soft-start time TSS
TSS = CSSX0.7V / 5μA [s]
CSS: The capacitance at the SS-pin
10 Verification of the operation by taking measurements
The overall characteristic may change by load current, input voltage, output voltage, inductance, load capacitance,
switching frequency, and the PCB layout. We strongly recommend verifying your design by taking the actual
measurements.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
14/20
2011.08 - Rev.B
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