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BD9A400MUV Datasheet(PDF) 4 Page - Rohm |
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BD9A400MUV Datasheet(HTML) 4 Page - Rohm |
4 / 35 page Datasheet Datasheet 4/32 TSZ02201-0J3J0AJ00730-1-2 © 2014 ROHM Co., Ltd. All rights reserved. 1.Jul.2014 Rev.001 www.rohm.com TSZ22111 • 15 • 001 BD9A400MUV Description of Blocks 1. VREF The VREF block generates the internal reference voltage. 2. UVLO The UVLO block is for under voltage lockout protection. It will shut down the IC when the VIN falls to 2.45V (Typ) or lower. The threshold voltage has a hysteresis of 100mV (Typ). 3. SCP After the soft start is completed and when the feedback voltage of the output voltage has fallen below 0.4V (Typ) for 1msec (Typ), the SCP stops the operation for 16msec (Typ) and subsequently initiates restart. 4. OVP Over voltage protection function (OVP) compares FB terminal voltage with the internal standard voltage VREF. When the FB terminal voltage exceeds 0.88V (Typ) it turns MOSFET of output part MOSFET off. After output voltage drop it returns with hysteresis. 5. TSD The TSD block is for thermal protection. The thermal protection circuit shuts down the device when the internal temperature of IC rises to 175 C (Typ) or higher. Thermal protection circuit resets when the temperature falls. The circuit has a hysteresis of 25°C (Typ). 6. SOFT START The Soft Start circuit slows down the rise of output voltage during start-up and controls the current, which allows the prevention of output voltage overshoot and inrush current. A built-in soft start function is provided and a soft start is initiated in 1msec (Typ) when the SS terminal is open. 7. gm Amplifier The gm Amplifier block compares the reference voltage with the feedback voltage of the output voltage. The error and the ITH terminal voltage determine the switching duty. A soft start is applied at startup. The ITH terminal voltage is limited by the internal slope voltage. 8. Current Comparator The Current Comparator block compares the output ITH terminal voltage of the error amplifier and the slope block signal to determine the switching duty. In the event of over current, the current that flows through the high-side MOSFET is limited at each cycle of the switching frequency. 9. OSC This block generates the oscillating frequency. 10.DRIVER LOGIC This block is a DC/DC driver. A signal from current comparator is applied to drive the MOSFETs. 11.PGOOD When the FB terminal voltage reaches 0.8V (Typ) within ±7%, the Nch MOSFET of the built-in open drain output turns off and the output turns high. |
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