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AH5795

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER


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AH5795 pdf
AH5795
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Description
The AH5795 is a single chip solution for driving single-coil
brushless direct current (BLDC) fans and motors. The
integrated full-bridge driver output stage uses soft switching
to minimize audible switching noise and electromagnetic
interference (EMI) providing a low noise solution.
Motor speed can be controlled by either changing the duty
ratio of the PWM signal at the PWM pin or by varying the
supply voltage at Vdd pin.
Pin Assignments
(Top View)
FG 1
Vss 2
O2 3
6 PWM
5 Vdd
4 O1
To help protect the motor coil, the AH5795 provides Rotor
Lock Protection which shuts down the output drive if rotor
lock is detected. The device automatically re-starts when the
rotor lock is removed. Over temperature shutdown provides
thermal protection for the device.
A Tachometer output is provided by open-drain Frequency
Generator (FG) Pin which allows external interface to monitor
motor rotation or speed. The FG output is the magnetic
change frequency.
The AH5795 is available in space saving and low profile
TSOT23-6 and DFN2020C-6 packages.
www.DataSheet.net/
TSOT23-6
(Top View)
PWM 1
Vdd 2
O1 3
6 FG
5 O2
4 Vss
DFN2020C-6
Features
• Supports single-coil full-wave BLDC fan drivers
• Built-in Hall sensor and input amplifier
• Operating voltage: 1.8V to 6V
• Speed control methods
o Vdd voltage speed control (PWM pin tied to Vdd)
o PWM signal speed control via PWM pin
• Soft switching for low noise DC fan motor applications
• Rotor Lock Protection (Lock detection, output shutdown
and automatic re-start)
• Toff clear when PWM is low for greater than 65ms
• Thermal protection
• Tachometer (FG) output
• No external timing capacitor - Reduces the numbers of
external components required
• Low profile package: TSOT23-6 and DFN2020C-6
• “Green” Molding Compound (No Br, Sb) (Note 1)
Applications
• 3.3V / 5V BLDC Cooling Fans
• Netbook/ Notebook BLDC fans
• Instruments cooling fans
• Low Voltage/ Low Power BLDC Motors
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
AH5795
Document number: DS35277 Rev. 1 - 2
1 of 13
www.diodes.com
August 2011
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.co.kr/



No Preview Available !

AH5795 pdf
Typical Application Circuit
SYSTEM
POWER
D1
C1 Dz
PWM signal for
speed control
AH5795
SINGLE PHASE HALL EFFECT LATCH SMART
FAN MOTOR CONTROLLER
Vdd
PWM AH5795
Vss
10Kohm
FG FG
O1
O2
Pin Descriptions
Pin Name
Description
Vdd Power supply pin
VSS Ground pin
O1 Output driving & sinking pin
O2 Output driving & sinking pin
PWM
PWM signal input pin for speed control
FG Frequency Generator (Note 2)
Notes: 2. The FG output is the same as the magnetic change frequency.
www.DataSheet.net/
AH5795
Document number: DS35277 Rev. 1 - 2
2 of 13
www.diodes.com
August 2011
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.co.kr/



Part Number AH5795
Description SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Maker Diodes - Diodes
Total Page 13 Pages
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