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AM4961A

SINGLE PHASE FULL WAVE PWM MOTOR DRIVER


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AM4961A pdf
A Product Line of
Diodes Incorporated
AM4961A
SINGLE PHASE FULL WAVE PWM MOTOR DRIVER
Description
The AM4961A is highly integrated feature rich single phase Brushless
Direct Current (BLDC) full wave motor driver with PWM control
function for fans, blowers and extractors.
For system flexibility the motor speed can be controlled by either an
external PWM signal or by a DC voltage or from a Thermistor
network. Based on the input signal, the AM4961A adjust the output
duty cycle.
To help protect the motor coil, the AM4961A provides a rotor lock
protection which shuts down the output if rotor lock is detected. The
device automatically re-starts when the rotor lock is removed.
To help interface to external system for monitoring the motor status
and speed, AM4961A provides open drain Rotor lock detect alarm
output (RD) pin and a tachometer output Frequency Generator (FG).
The FG output is the magnetic change frequency.
The AM4961A is available in SSOP-16 and HTSSOP-14 packages.
Features
Operating voltage : 3.5V to 16V
Internal H-Bridge with 1A Peak Current Capability
Speed Control with external PWM, DC or Thermistor signals
Minimal Speed Setting
Built-in Hall Bias Circuit
Reference Voltage Output
Rotor Lock Protection with Output Shutdown and Auto Restart
Rotation Speed Indication (FG)
Rotation or Lock State Indication (RD)
Built-in Thermal Shutdown Circuit
Industry standard SSOP-16 and Thermally Enhanced
HTSSOP-14 Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
OUT2 1
16 PGND
NC 2
15 OUT1
VCC 3
14 GND
VMIN 4
13 CT
VPWM 5
12 VREF
COSC 6
11 HIN-
FG 7
RD 8
10 HB
9 HIN+
SSOP-16 (GS Package)
(Top View)
PGND
PGND
OUT2
VCC
VMIN
VPWM
1
2
3
4
COSC
FG
RD
5
6
7
14 OUT1
13 GND
12 CT
11 VREF
10 HIN-
9 HB
8 HIN+
HTSSOP-14 (GH Package)
Applications
12V BLDC Cooling Fans, Motors, Extractors and Blowers
CPU Cooler Fan in PC
Instrumentation and Equipment Cooling fans
Brushless DC Motor Driver
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AM4961A
Document number: DS36626 Rev. 1 - 2
1 of 17
www.diodes.com
October 2013
© Diodes Incorporated



No Preview Available !

AM4961A pdf
A Product Line of
Diodes Incorporated
AM4961A
Typical Applications Circuit
Note:
VCC
D1
C1
1µF or greater
R1
27k
L1
PWM
R3 7.5k
R2
10k
R4 39k
Q1
R6 330k
R7
100k
R5 100k
AM4961A
1 (1) OUT2
14 (15)
OUT1
2 (3)
VCC
GND 13 (14)
3 (4) VMIN
CT 12 (13)
4 (5) VPWM
VREF 11 (12)
5 (6) COSC
HIN- 10 (11)
6 (7) FG
HB 9 (10) Hall
7 (8) RD PGND HIN+ 8 (9)
(16)
C2
0.33µF
C3
100pF
R8 68k
Typical Application Circuit with an External Input PWM Speed Control Signal
4. C1 is for power stabilization and should be 1µF or higher depending on the motor current and motor design.
C4
0.47µF
Pin Descriptions
Package: HTSSOP-14 and SSOP16
Pin Number
HTSSOP-14
SSOP-16
11
–2
23
34
45
56
67
78
89
9 10
10 11
11 12
12 13
13 14
14 15
– 16
Pin Name
OUT2
NC
VCC
VMIN
VPWM
COSC
FG
RD
HIN+
HB
HIN-
VREF
CT
GND
OUT1
PGND
Function
Drive output 2
No connection
Power supply
Minimum duty setting
Adjustable input
Oscillator capacitor
Rotation speed indicator
Rotation/lock state indicator
Hall sensor input+
Hall sensor bias regulator
Hall sensor input-
Reference voltage regulator
Lock and rotation setting capacitor terminal
Ground for control circuit
Drive output 1
Power ground
AM4961A
Document number: DS36626 Rev. 1 - 2
2 of 17
www.diodes.com
October 2013
© Diodes Incorporated



Part Number AM4961A
Description SINGLE PHASE FULL WAVE PWM MOTOR DRIVER
Maker Diodes - Diodes
Total Page 17 Pages
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