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BD1606MVV Arkusz danych(PDF) 8 Page - Rohm |
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BD1606MVV Arkusz danych(HTML) 8 Page - Rohm |
8 / 12 page 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. |
Podobny numer części - BD1606MVV_11 |
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Podobny opis - BD1606MVV_11 |
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