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BD1606MVV Arkusz danych(PDF) 8 Page - Rohm

Numer części BD1606MVV
Szczegółowy opis  Backlight LED Driver for Small LCD Panels (Charge Pump Type)
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Producent  ROHM [Rohm]
Strona internetowa  http://www.rohm.com
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BD1606MVV Arkusz danych(HTML) 8 Page - Rohm

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Technical Note
8/11
www.rohm.com
2011.04 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
BD1606MVV
(2) Charge pump
a) Description of operations
Pin voltage comparison takes place at Vout control section, and then Vout generaton takes place so that the LED
cathode voltage with the highest Vf is set to 0.1V. A boost rate is changed automatically to a proper one at the Charge
Pump Mode Control section so that operation can take place at possible low boost rate. When the current taken from
VBAT exceeds 600mA, the overcurrent limiter is activated and this IC is reset. In addition, if the output voltage falls
below 1.5V, this IC is reset for short-circuit at output.
b) Soft start function
BD1606MVV have a soft start function that prevents the rush current.
Soft Start
Ordinal mode
EN/LED*
VOUT
ILED
TOFF
Fig.15 Soft Start
c) Automatic boost rate change
The boost rate automatically switches to the best mode.
* (×1 mode -> ×1.5 mode) or (×1.5 mode -> ×2 mode)
If a battery voltage drop occurs BD1606MVV cannot maintain the LED constant current, and then mode
transition begins.
* (×1.5 mode -> ×1 mode) or (×2 mode -> ×1.5 mode)
If a battery voltage rise occurs, VOUT and VIN detection are activated, and then mode transition begins.
(3) UVLO (Ultra low Voltage Lock Out)
If the input voltage falls below 2.2V, BD1606MVV is shut down to prevent malfunction due to ultra-low voltage.
(4) OVP (Over Voltage Protection)
This circuit protects this IC against damage when the C/P output voltage (Vout) rises extremely for some external factors.
(5) Thermal shutdown (TSD)
To protect this IC against thermal damage or heat-driven uncontrolled operations, this circuit turns off the output if the
chip temperature rises over 150℃. In addition, it turns on the output if the temperature returns to the normal temperature.
Because the built-in thermal protection circuit is intended to protect the IC itself, the thermal shutdown detection
temperature must be set to below 150℃ in thermal design.


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