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BD3507HFV Datasheet(PDF) 6 Page - Rohm |
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BD3507HFV Datasheet(HTML) 6 Page - Rohm |
6 / 16 page Technical Note 6/15 BD3507HFV www.rohm.com 2010.05 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. ● Block Function ・ AMP An error amplifier that compares reference voltage (VREF) to Vo and drives Nch FET (Ron=300 mΩ) of output. The frequency characteristics are optimized so that ceramic capacitors can be used for output capacitors and high-speed transient response can be achieved. The input voltage range at the AMP section is GND-2.7V and the output voltage range of the AMP section is GND-VCC. At the time of EN OFF or UVLO, the output is brought to the LOW level and the output NchFET is turned OFF. ・ EN By the logic input pin, regulator ON/OFF is controlled. At the time of OFF, the circuit current is controlled to be 0µA to reduce the standby current consumption of the apparatus. In addition, EN turns ON FET that can discharge VREF and Vo and removes excess electric charge to prevent maloperation of IC on the load side. Since there is no electrical connection with the Vcc terminal as is the case of Di for electrostatic measures, it does not depend on the input sequence. ・ UVLO UVLO turned OFF output to prevent output voltage from making maloperation at the time of Vcc reduced voltage. Same as EN, UVLO discharges VREF and Vo. When voltage exceeds the threshold voltage (TYP 3.8V), UVLO starts output. ・ CURRENT LIMIT In the event the output current that exceeds the current (0.6A or more) set inside the IC flows when output is turned ON, output voltage is attenuated to protect the IC on the load side. When current reduces, output voltage returns to the set voltage. ・ SOFT START Adding external resistor and capacitor to VREF pin can achieve soft-start. By the time constant that is determined by the time constant of CR, VREF pin becomes dull, and output rises in synchronism with VREF pin. Overshoot of output voltage or inrush current can be prevented. ・ VREF VREF is a reference voltage input pin and sets output voltage. Since there is no electrical connection with the Vcc terminal as is the case of Di for electrostatic measures, it does not depend on the input sequence. ・ TSD(Thermal Shut down) In order to prevent thermal breakdown and thermal runaway of the IC, the output is turned OFF when chip temperature becomes high. In addition, when temperature returns to the specified temperature, the output is recovered. However, since the temperature protection circuit is originally built in to protect the IC itself, thermal design within Tj(max) is requested. ・ VIN This is a large-current supply line. The VIN terminal is connected to the rain of output NchFET. Since there is no electrical connection with the Vcc terminal as is the case of Di for electrostatic measures, it does not depend on the input sequence. However, because there is body Di of output Nch FET between VIN and Vo, there is electrical connection (Di-connection) between VIN and Vo. Consequently, when the output is turned ON/OFF by VIN, reverse current flows from Vo to VIN, to which care must be taken. |
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