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AH277A

Two Phase 12V/24 BLDC All-In-One Fan and Motor Drive Latch

Datasheet

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Description

The AH277A is an integrated Hall sensor with output driver designed for electronic commutation of brushless DC motor applications. The device includes an onchip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection, a temperature compensation circuit to compensate the temperature drift of Hall sensitivity and two complementary open-collector drivers for sinking large load current. It also includes an internal band-gap regulator which is used to provide bias voltage for internal circuits. Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the pin DO will be turned low (on) and pin DOB will be turned high (off). This output state is held until the magnetic flux density reverses and falls below BRP, then causes DO to be turned high (off) and DOB turned low (on).

Feature(s)

· On-Chip Hall Sensor · 3.5V to 16V Supply Voltage · 400mA (avg) Output Sink Current · Reversed Supply Voltage Protection · -20°C to 85°C Operating Temperature · Low Profile TO-94 (SIP-4L) Package · ESD Rating: 300V (Machine Model)

Application(s)

· Dual-Coil Brushless DC Motor · Dual-Coil Brushless DC Fan · Revolution Counting · Speed Measurement

Product Specifications

Product Parameters

Compliance(Only Automotive supports PPAP)	Standard
AEC Qualified	No
Type	Latch
Outputs	Dual Complementary
Output Type	Open Collector
Active Output State (B > Bop)	Low
Inactive Output State (B < Brp)	High-Z
Operating Voltage (V)	3.5 to 16
Average Supply Current (mA)	0.012
Min Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	10, 5
Typ Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	30
Max Operating Point Bop (Bops +ve/ Bopn -ve) (Gauss)	50, 70, 100
Min Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	-50, -70, -100
Typ Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	-30
Max Release Point Brp (Brps +ve/ Brpn -ve) (Gauss)	-10, -5
Output Current Capability (mA)	400, 800
Operating Ambient Temperature (°C)	-20 to 85

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2527	2021-06-09	2021-09-09	Additional Wafer Source (GFAB, JKFAB), New Bill of Materials (BOM) with PdCu Bond Wire, and Additional Assembly/Test (A/T) Site (CAT)