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BD9P105MUF-CE2 Datasheet(PDF) 7 Page - Rohm |
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BD9P105MUF-CE2 Datasheet(HTML) 7 Page - Rohm |
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7 / 60 page  7/57 © 2019 ROHM Co., Ltd. All rights reserved. 28.Apr.2020 Rev.001 www.rohm.com TSZ22111 • 15 • 001 BD9P1x5MUF-C Series TSZ02201-0J1J0AL01500-1-2 Description of Blocks - PreReg This block is the internal power supply for TSD and VREF circuits. - VREG This block is the internal power supply circuit. It outputs 3.3 V (Typ) and is the power supply to the control circuit and Driver. - TSD This is the thermal shutdown circuit. It will shut down the device when the junction temperature (Tj) reaches to 175 °C (Typ) or more. When the Tj falls below the TSD threshold with hysteresis of 25 °C (Typ), the circuits are automatically restored to normal operation. - VREF The VREF block generates the internal reference voltage. - POR The POR block is power on reset for internal logic circuit. The IC releases power on reset and starts operation with soft start when the VIN rises to 3.8 V (Typ) or more. - UVLO REG The UVLO block is for under voltage lockout protection. It will shut down the device when the VREG falls to 2.85 V (Typ) or less. This protection is released when VREG voltage increase to 2.95 V (Typ) or more. - MODE This block detects the MODE pin signal and controls switching mode. When the MODE pin is logic high level or is applied external clock, switching operation becomes forced PWM mode regardless load current. When the MODE pin is open or logic low level, switching operation changes between PWM and light load operation depending on load current. - OSC This block generates the clock frequency. When the clock is applied to the MODE pin, it synchronizes to external clock. Connect the SSCG pin to GND to disable Spread Spectrum function and connect the SSCG pin to the VREG pin to enable it. - OVP This is the output over voltage protection (OVP) circuit. When the output voltage +7.3 % (Typ) or more of the normal regulation voltage, VOUT is reduced by forced PWM switching. After output voltage falls +4.7 % (Typ) or less, the operation recovers into normal condition. - SCP This is the short circuit protection circuit. After soft start is completed, the switching is disabled if the output voltage falls SCP Threshold voltage or less for 0.9 ms (Typ). This short circuit protection is maintained for 30 ms (Typ) and then automatically released. - Soft Start This function starts up the output voltage taking 3 ms (Typ) to prevent the overshoot. - GmAmp1 This block is an error amplifier and its inputs are the reference voltage 0.8 V (Typ) and the FB voltage. - GmAmp2 This block sends the signal Vc which is composed of the GmAmp1 output and the current sense signal to PWM Comp. - Clamper1 This block clamps GmAmp1 output voltage and inductor current. It works as the over current protection and LLM control current. - Clamper2 This block clamps GmAmp2 output voltage. - Current Sense This block detects the amount of change in inductor current through the Low Side FET and sends a current sense signal to GmAmp2. |
Similar Part No. - BD9P105MUF-CE2 |
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Similar Description - BD9P105MUF-CE2 |
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