Diodes AM4967 User Manual
Data Sheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
General Description
The AM4967 is a single-coil, single-phase motor predriver designed by bipolar process. Its rotation speed
can be controlled through an external PWM. This IC
requires few external components and has the merit of
high efficiency which make it suitable for use in great
air volume, large current and high voltage applications.
The AM4967 is available in SSOP-16 package.
Features
· Single-phase Full-wave Pre-drive
· Rotation Speed Control via External PWM
· Maximum Operating Current Limit
· Linear Start Function for Reducing Large Current
Impulse at the Moment of Turn-on
· Minimum Rotation Speed Setting
· Lock Protection and Auto Start Function
· Rotation Speed Indication
· Over Temperature Protection
Application
· CPU and OA (Office Automation) Cooler Fan
· Brushless DC Motor
SSOP-16
Figure 1. Package Type of AM4967
Oct. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
1
Data Sheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Pin Configuration
GS Package
(SSOP-16)
OUT2
OUT2B
VCC
CS
VMIN
VPWM
COSC
FG/RD
1
2
3
4
5
6
7
8
16
15
14
13
12
11
HIN+
10
9
OUT1
OUT1B
GND
VREF
LS
CT
HIN-
Figure 2. Pin Configuration of AM4967
Oct. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Pin Description
Pin Number Pin Name Function
1 OUT2
2 OUT2B
3 VCC Power supply
4CS
5VMIN
6VPWM
7COSC
8FG/RD
9HIN-
10 HIN+
11 CT
12 LS
Second channel P-type driver output. Open-drain output, must be connected
with pull-up resistor to drive external power devices in operation
Second channel N-type driver output. Push-pull output to drive external
power devices
Current limiter indicator. Fixed to 0.2V internally. Maximum allowable current is decided by external sample resistance. When the voltage of this pin
exceeds 0.2V, the output will be shut down by current limit. If this function is
not used, connect this pin to ground directly
Minimum speed setting terminal. Connect it to VREF whe n disused. In case it
is tied to other power supply for controlling, an isolated resistor is necessary
Speed control terminal. It is full speed mode when connected to ground. If the
speed is controlled by PWM mode, the frequency of control signal is 20kHz
to 100kHz. Moreover, a low pass network is necessary to transfer PWM to
DC level
PWM basic oscillation frequency generator when connected with a capacitor
of 220pF. 30kHz frequency is available.
"FG" means pin 8 is an output pin of FG signal which is used for detecting
rotation speed. "RD" means pin 8 is an output pin of RD signal, and is used
for detecting fan rotate-stop state. "FG" and "RD" can be selected according
to the requirement. This pin need to be connected with pull-up resistor when
used. A new pulse will be generated once input signal changed. Keep this pin
open when it is not to be used
Hall sensor negative input. To prevent noise, this pin is recommended to be
placed as close as possible to Hall circuit. If necessary, a capacitor may be
added between HIN+ and HIN- to reduce the influence caused by noise
Hall sensor positive input. To avoid noise, this pin is recommended to be
placed as close as possible to Hall circuit
Lock protection and auto start frequency generator. It is connected with an
external 0.47µF capacitor which decides lock-rotate time and start time. If
lock-rotate protection function is disused, please connect this pin to GND
Linear start terminal. This pin is connected to VREF externally via a capacitor
of 0.47µF to 1µF which enables fan start steadily. Start time is dependent to
the capacitance. If linear start function is not used, connect this pin to ground
13 VREF 5V voltage reference
14 GND Ground for circuit control
15 OUT1B
16 OUT1
Oct. 2008 Rev. 1. 2
First channel N-type driver output. Push-pull output to drive external power
devices
First channel P-type driver output. Open-drain output, must be connected with
pull-up resistor to drive external power devices in operation
BCD Semiconductor Manufacturing Limited
3
Data Sheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Functional Block Diagram
8
15
16
FG/RD
OUT1B
OUT1
2
OUT2B
1
OUT2
CT
VCC
VREF
HIN+
HIN-
11
3
13
10
9
Lock Shutdown
Auto Restart
5V
Reference
Hysteresis
Amp
and
Controller
Thermal Shutdown
Pre-
driver
Hysteresis
Amp
Oscillation
12
LS
67
5
VPWM
VMIN
COSC
4
CS GND
Figure 3. Functional Block Diagram of AM4967
14
Oct. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Data Sheet
ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967
Truth Table
1. Driver-lock. V
HIN- HIN+ CT OUT1 OUT1B OUT2 OUT2B FG/RD Mode
HL
L H OFF H L L OFF OUT2 OUT1 (Driver)
HL
L H OFF H OFF L OFF
is High, V
OSC
L
H
, V
PWM
L L OFF H L OUT1 OUT2 (Driver)
OFF L OFF H L
and VLS are low.
VMIN
Lock Protection
2. Speed control. VCT, VLS are low.
VPWM, VMIN COSC HIN- HIN+ OUT1 OUT1B OUT2 OUT2B Mode
H L L L OFF H OUT1 OUT2 (Driver)
LH
HL
L H OFF H L L OUT2 OUT1 (Driver)
HLOFFLOFFH
LHOFFHOFFL
Regenerative
Ordering Information
AM4967 -
Circuit Type
E1: Lead Free
G1: Green
Pin 8
R: RD
Blank: FG
TR: Tape and Reel
Blank: Tube
Package
GS: SSOP-16
Package
SSOP-16
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 package.
Temperature
Range
-30 to 105
o
Lead Free Green Lead Free Green
AM4967GS-E1 AM4967GS-G1 AM4967GS AM4967GS-G1 Tube
AM4967GSTR-E1 AM4967GSTR-G1 AM4967GS AM4967GS-G1 Tape & Reel
C
AM4967RGS-E1 AM4967RGS-G1 AM4967RGS AM4967RGS-G1 Tube
AM4967RGSTR-E1 AM4967RGSTR-G1 AM4967RGS AM4967RGS-G1 Tape & Reel
Oct. 2008 Rev. 1. 2
Part Number Marking ID
BCD Semiconductor Manufacturing Limited
Packing
Type
5
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