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BD9326EFJ-LBE2 Datasheet(PDF) 8 Page - Rohm |
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BD9326EFJ-LBE2 Datasheet(HTML) 8 Page - Rohm |
8 / 23 page BD9325FJ-LB BD9326EFJ-LB BD9327EFJ-LB Application Information 1. Block Operation (1) VREG This block generates the constant-voltage needed for DC/DC boosting. (2) VREF This block generates the 2.9 V internal reference voltage of the Error Amp. (3) TSD/UVLO TSD (Thermal shutdown)/UVLO (Under Voltage Lockout) are protection circuit blocks. This circuit protects the device from damages due to excessive heat and power dissipation. When the TSD circuit is triggered by temperature exceeding the 175°C Maximum Junction Temperature, it shuts down the device. Once temperature falls below the threshold set by a hysteresis, the device resumes operation. UVLO circuit prevents error in the device operation due to either excessive or insufficient power supply voltage. It monitors the voltage level at VIN pin and also the output of REG block. Once VIN voltage falls below 4.4V, the UVLO circuit disables the device and resets the Soft-Start circuit. Typical UVLO Hysteresis is 100 mV. (4) Error Amp Block (ERR) This circuit compares the reference voltage and the feedback of output voltage. The COMP pin voltage, which is the output of ERR block, determines the switching duty. During startup, the COMP pin voltage is limited by SS pin voltage since the soft start is operated by the SS pin voltage. (5) Oscillator Block (OSC) This block generates the internal oscillating frequency of the IC. (6) SLOPE Block This circuit is used to generate triangular waveform from the clock created by OSC block. This triangular waveform is sent to the PWM comparator. (7) PWM Block The COMP pin voltage, which is the output of ERR block, is compared to the SLOPE block's triangular waveform to determine the switching duty. Since the switching duty is limited by the maximum duty ratio which is determined internally, it does not become 100%. (8) DRV Block This circuit is a DC/DC driver block. A signal from the PWM serves as the input to drive the power FETs. (9) OCP Block OCP (Over-Current Protection) is a protection circuit block. The OCP block activates when the current flows through the FET is detected, and OCP starts when it reached 2.5 / 3.5 / 4.5A (min). After OCP, switching will turn OFF and SS capacitor will discharge. OCP is a self-recovery type (not latch). (10) Soft Start Circuit The soft-start feature reduces overshoot in the output by making the regulator reach steady-state gradually. The soft-start capacitor, CSS, which is connected to SS (pin 8) and GND (pin4), sets the soft-start time, tSS. (Refer to Figure 23 to know how to set CSS.) 8/19 09.Sep.2014 Rev.003 www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 TSZ02201-0323AAJ00440-1-2 |
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