BD63536FJ Просмотр технического описания (PDF) - ROHM Semiconductor
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BD63536FJ Datasheet PDF : 17 Pages
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BD63536FJ
Technical Note
●Description of pins and functions
○VCC: Power supply pin
To apply large drive currents, provide thick and short low impedance wiring, and make current adjustment with careful
attention paid to PWM switching noise so that VCC voltage will be stable. It is also possible to arrange laminated ceramic
capacitors of approximately 0.01µ to 0.1µF in parallel with the aim of reducing power supply impedance in a broad frequency
band. Take extra care for VCC voltage so that it will not exceed its rating even for a moment. The VCC pin has a built-in clamp
element for electrostatic breakdown protection. If a sudden pulse signal or voltage such as a surge exceeding the absolute
maximum rating is applied, this clamp element may be activated to lead to breakdown. To avoid this, NEVER exceed the
absolute maximum rating. It is also effective to mount a zener diode having a rating approximate to the absolute maximum
rating. In addition, note that since a diode for electrostatic breakdown protection is inserted between the VCC pin and the
GND pin, if an inverse voltage is applied to the VCC pin and the GND pin, the IC may lead to breakdown.
○GND: Ground pin
In order to reduce noises due to switching current and stabilize the internal reference voltage of IC, minimize wiring
impedance from this pin and maintain the potential at the minimum level in any operating state. In addition, design patterns
so that the pin has no common impedance to other GND patterns.
○VREF: 2.5V regulator output pin
The VREF pin is a pin used to output internal reference voltage 2.5V (typ.) generated from power supply voltage input to the
VCC pin. In order to stabilize power supply, be sure to connect a 0.1µF capacitor. This pin is also used as a bias power supply.
For this application, set a load current to approximately 1mA or less. In addition, note that grounding this pin may pass a
large current through the IC, causing it to break down.
○FB: Error amplifier output pin
The FB pin is an output pin of the feedback error amplifier.
○IN-: Error amplifier input pin
The IN- pin is an input pin of the feedback error amplifier.
○GATE: External FET drive pin
This GATE pin is a pin used to drive the external FET gate. Since output H voltage is “VCC voltage 0.05V (typ)” and output L
voltage is “VCC voltage 5.4V (typ)”, the pin is able to directly drive the external FET gate. Provide thick and short low
impedance wiring from this pin. The GATE pin has a built-in clamp element for electrostatic breakdown protection. If a
sudden pulse signal or voltage such as a surge exceeding the absolute maximum rating is applied, this clamp element may
be activated to lead to breakdown. To avoid this, NEVER exceed the absolute maximum rating. It is also possible to make
switching rate adjustment by mounting a resistor between the GATE pin and the external FET. In addition, note that since the
GATE pin is designed to connect the internal regulator to CMOS output, if voltages between the VCC pin and the GATE pin
causes a significant difference by grounding or else, the IC may lead to breakdown.
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2009.11 - Rev.A
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