Diodes AM4961 User Manual
Data Sheet
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961
General Description
The AM4961 is a full wave driver IC with PWM control function. It is used for single phase motor and is
capable of speed control by changing output duty
cycle.
The AM4961 is available in SSOP-16 and HTSSOP14 packages.
Features
· Built-in Hall Bias Circuit
· Built-in PWM Speed Control Circuit
· Built-in Minimal Speed Setup Circuit
· Rotation Speed Indication (FG)
· Rotation or Lock State Indication (RD)
· Built-in Thermal Shutdown Circuit
· Lock Protection
· Output Current Limit
Application
· CPU Cooler Fan in PC
· Brushless DC Motor Driver
SSOP-16
Figure 1. Package Types of AM4961
May. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
1
HTSSOP-14
Data Sheet
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961
Pin Configuration
GS Package
(SSOP-16)
OUT2
NC
VCC
VMIN
VPWM
COSC
FG
RD
PGND
1
2
3
4
5
6
7
8
GH Package
(HTSSOP-14)
16
15
14
13
12
11
10
PGND
OUT1
GND
CT
VREF
HIN-
HB
9
HIN+
PGND
OUT2
VCC
VMIN
VPWM
COSC
FG
RD
Figure 2. Pin Configuration of AM4961 (Top View)
May. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT1
GND
CT
VREF
HIN-
HB
HIN+
2
Data Sheet
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961
Pin Description
Pin Number
HTSSOP-14 SSOP-16
1 1 OUT2 Driver output 2
2 NC No connection
2 3 VCC Power supply
3 4 VMIN Minimum duty setting
4 5 VPWM Adjustable Input
5 6 COSC Oscillator capacitor
6 7 FG Rotation speed indicator
7 8 RD Rotation/lock state indicator
8 9 HIN+ Hall sensor input +
9 10 HB Hall sensor bias regulator
10 11 HIN- Hall sensor input -
11 12 VREF Reference voltage regulator
12 13 CT Lock and rotation setting capacitor terminal
13 14 GND Ground for control circuit
14 15 OUT1 Driver output 1
16 PGND Power ground
Pin Name Function
May. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
3
Data Sheet
Lock Shutdown
and
Auto Restart
Voltage
Reference
Hall Bias
Thermal Shutdown
Hysteresis Amp
Control
Circuit
Oscillation Circuit
CT
VCC
VREF
HB
HIN+
HIN-
VMIN
VPWM
COSC
GND
PGND
OUT1
OUT2
RD
FG
2 (3)
11 (12)
9 (10)
8 (9)
10 (11)
3 (4)
4 (5)
5 (6)
13 (14)
(16)
14 (15)
1 (1)
7 (8)
6 (7)
12 (13)
Pre-driver
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961
Functional Block Diagram
A (B)
May. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
A for 14-pin
B for 16-pin
Figure 3. Functional Block Diagram of AM4961
4
Data Sheet
SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961
Truth Table
HIN- HIN+ COSC (Note 1) CT OUT1 OUT2 FG RD Mode
HL
, V
H
L
H
L
OSC
(L) <V
PWM
L
H
.
LH LHOFF
HL
LH LOFFOFF
HL
L H OFF H OFF
HL
L H OFF OFF OFF
Note 1: V
OSC
(H) >V
PWM
HLL
OFF L L
HOFFL
OFF OFF L
Ordering Information
AM4961 -
Circuit Type
Rotation (Drive)
L
Rotation (Recirculate)
OFF Lock Protection
E1: Lead Free
G1: Green
Package
GS: SSOP-16
TR: Tape and Reel
Blank: Tube
GH: HTSSOP-14
Package
SSOP-16
HTSSOP-14
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green packages.
May. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited
Te mp er a tu re
Range
-30 to 90
o
C
Lead Free Green Lead Free Green
AM4961GS-E1 AM4961GS-G1 AM4961GS AM4961GS-G1 Tube
AM4961GSTR-E1 AM4961GSTR-G1 AM4961GS AM4961GS-G1 Tape & Reel
AM4961GH-E1 AM4961GH-G1 AM4961GH AM4961GH-G1 Tube
AM4961GHTR-E1 AM4961GHTR-G1 AM4961GH AM4961GH-G1 Tape & Reel
Part Number Marking ID
Packing
Typ e
5
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