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Part Number: A277
Description: A277 are integrated Hall sensors with output drivers designed for electronic commutation of brus...
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A277
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DataSheet
General Description
A277 General Description
A277 are integrated Hall sensors with output drivers designed for electronic commutation of brushless DC motor applications. The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise rejection, and complementary open-collector drivers for sinking large current loads. An internal bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range.
If a magnetic flux density larger than threshold Bop, DO is turned on(low) and DOB is turned off (high). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off and DOB turned on.
A277 Maximum Ratings
Supply Voltage, Vcc --------------------------------20V
Reverse VCC Polarity Voltage, VRCC-----------35V
Magnetic flux density, B ------------------ Unlimited
Output OFF Voltage, Vce -------------- 50V(Note 1)
Output ON Current, Ic
Continuous ----------------------------- 400mA
Hold-------- ------------------------------ 500mA
Peak (Start Up) -------------------------700mA
Operating Temperature Range,
Ta ----------------------------(-20 to +85 )
Storage Temperature Range,
Ts----------------------------(-65 to +150)
Package Power Dissipation,
Pd----------------------------------------500mW
Maximum Junction Temp , Tj------------------ 175
Reverse VCC Polarity Voltage, VRCC-----------35V
Magnetic flux density, B ------------------ Unlimited
Output OFF Voltage, Vce -------------- 50V(Note 1)
Output ON Current, Ic
Continuous ----------------------------- 400mA
Hold-------- ------------------------------ 500mA
Peak (Start Up) -------------------------700mA
Operating Temperature Range,
Ta ----------------------------(-20 to +85 )
Storage Temperature Range,
Ts----------------------------(-65 to +150)
Package Power Dissipation,
Pd----------------------------------------500mW
Maximum Junction Temp , Tj------------------ 175
A277 Features
On-chip Hall sensor with two different sensitivity and hysteresis settings for A277.
Internal bandgap regulator allows temperature compensated operations and a wide operating voltage range.
High output sinking capability up to 400mA for driving large load.
Lower current change rate reduces the peak output voltages during switching.
Build in protection diode for chip reverse power connecting.
Available in die form or rugged low profile 4 pin SIP packages.
Internal bandgap regulator allows temperature compensated operations and a wide operating voltage range.
High output sinking capability up to 400mA for driving large load.
Lower current change rate reduces the peak output voltages during switching.
Build in protection diode for chip reverse power connecting.
Available in die form or rugged low profile 4 pin SIP packages.
A277 Typical Application
Brushless DC Motor
Brushless DC Fan
Revolution Counting
Speed Measurement
Brushless DC Fan
Revolution Counting
Speed Measurement
A277 Connection Diagram
A277
PDF/DataSheet Download
- Datasheet: A277
- File Size: 169256 KB
- Manufacturer: ETC [ETC]
- Click here to Download
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