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

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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

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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

Data Sheet

ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Voltage V

OUT1B/OUT2B Output Current I

OUTB

OUT1/OUT2 Sink Current I

OUT1B/OUT2B/OUT1/OUT2

V

Withstand Voltage
VPWM/VMIN Withstand Voltage V

PWM/VVMIN

LS Withstand Voltage V

FG/RD Withstand Voltage V

FG/RD Output Current I

FG/VRD

FG/IRD

VREF Output Current I

Power Dissipation (Note 2) P

Storage Temperature Range T

CC

OUT

OUT

LS

REF

D

STG

18 V

20 mA

20 mA

18 V

7V

7V

V

CC

V

10 mA

20 mA

800 mW

-55 to 150

o

C

ESD (Human Body Model) ESD 2000 V

Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods
may affect device reliability.

Note 2: When mounted on the specified printed circuit board (114.3mm

×76.1mm×1.6mm, glass epoxy).

Recommended Operating Conditions

Parameter Symbol Min Typ Max Unit

Supply Voltage V

CC

VPWM/VMIN Input Voltage 0 5 V

Hall Input Voltage 0.2 3 V

Ambient Temperature T

A

5.5 16 V

-30 105

o

C

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

Electrical Characteristics

(VCC=12V, TA=25oC, unless otherwise specified.)

Parameter Symbol Conditions Min Typ Max Unit

Quiescent Current

VREF Reference Voltage

Current Limit Voltage

COSC High Level Voltage

COSC Low Level Voltage

COSC Frequency

CT High Level Voltage

CT Low Level Voltage

CT Charge Current

CT Discharge Current

CT Charge and Discharge Ratio

Linear Start Charge Current

OUT1B/OUT2B High Level Voltage

OUT1B/OUT2B Low Level Voltage

I

I

V

V

V

V

f

V

V

I

I

R

I

V

V

Q1

Q2

REF

LIM

OSCH

OSCL

OSC

CTH

CTL

CHG

DHG

CD

LS

OBH

OBL

Lock off 8 10 12

Lock on 8 10 12

I

OUT

=5mA

4.5 5.0 5.5 V

186 200 215

3.0 3.4 3.8 V

0.9 1.1 1.3 V

CL=220pF

25.4 30 35.5 kHz

2.4 3.3 3.6 V

1.0 1.3 1.6 V
VCT=0.5V

VCT=3.5V

I

CHG/IDHG

VLS=1V

I

=10mA VCC-

OUT

I

=10mA

OUT

1.5 2 2.5 µA

0.13 0.2 0.25 µA

8.5 10 14.5

0.5 0.7 µA

VCC-

1.8

0.9

V

CC

0.9 1.5 V

mA

mV

V

OUT1/OUT2 Low Level Vol ta g e

FG Signal Hall Input Sensitivity

FG Saturation Voltage

FG Leakage Current

VPWM/VMIN Bias Current

Oct. 2008 Rev. 1. 2

I

V

V

OL

HN

=10mA

OUT

I

HIN+, IHIN-

difference voltage

(include offset and hysteresis)
I

V

SAT

I

LFG

I

PWMB/IVMINBVOSC=VPWM/VVMIN

SINK

VFG=V

=5mA

CC

BCD Semiconductor Manufacturing Limited

7

=2V

0.45 0.8 V

±10 mV

200 500 mV

30 µA

0.1 3 µA

Data Sheet

ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967

Typical Performance Characteristics

16

14

12

10

8

Supply Current (mA)

6

4

2 4 6 8 1012141618

Supply Voltage (V)

TA=25°C

Figure 4. Supply Current vs. Supply Voltage

16

14

12

10

8

6

Supply Current (mA)

4

2

0

-40-30-20-100 1020304050607080

Ambient Temperature (OC)

VCC=12V

Figure 5. Supply Current vs. Ambient Temperature

6.0

5.5

5.0

4.5

Reference Voltage (V)

4.0

3.5

-40-30-20-100 102030405060708090

Ambient Temperature (OC)

Figure 6.

Reference Voltage

vs. Ambient Temperature

VCC=12V
I

=5mA

OUT

7.5

7.0

6.5

6.0

5.5

5.0

4.5

4.0

Reference Voltage (V)

3.5

3.0

2.5
0 2 4 6 8 101214161820

Output Current (mA)

Figure 7. Reference Voltage

vs. Output Current

VCC=12V
TA=25OC

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

Typical Performance Characteristics (Continued)

1000

800

600

400

Power Dissipation (mW)

200

0

-20 0 20 40 60 80 100

Ambient Temperature (°C)

Figure 8. Power Dissipation vs. Ambient Temperature

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

Operating Diagram

VPWM Voltage

VMIN Voltage

COSC Voltage

0V

FG

f

=30kHz (C

OSC

ON-Duty-Small

Minimum Speed Setup
Rotation (Stop Mode)

OSC

Low
Speed

=220pF)

PWM Adjustable
Speed

ON-Duty-Large

High
Speed

3.0V

1.0V

Full Speed

RPM

Figure 9. Operating Diagram 1 of AM4967 (Speed Control, Note 3)

Note 3:

1. Minimum Speed Setting Mode (Stop Mode)

When fan rotate at low speed, its lowest speed is settable
by VMIN pin voltage. If not, fan motor stops.

2. Low Speed to High Speed Setting Mode

PWM control system works by comparing the voltage of
VPWM and COSC (1.0V to 3.0V). When VPWM voltage
is low, the transistors of the upper and lower side outputs
are ON. On contrary, when VPWM voltage is high, the
upper side transistors are OFF. And coil current re-circu­lates in a lower side transistor. Therefore, as the VPWM

voltage becomes lower, output ON duty becomes large.
Sequentially, coil current increases and the motor runs at
high speed which is monitored by FG output while rota­tion-stop state is monitored by RD output.

3. Full Speed Rotation Mode

When VPWM voltage drops to 1.0V or lower, motor fan
will run at full speed. (If the speed is not controlled,

=GND)

V

PWM

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

Operating Diagram (Continued)

LS Voltage

3.0V

VMIN Voltage

COSC

VPWM Voltage

0V

Lock Protection Linear Start VPWM Setting Speed

100%

ON-Duty

0%

Figure 10. Operating Diagram 2 of AM4967 (Linear Start, VPWM Voltage<VMIN Voltage, Note 4)

1.0V

VPWM Voltage

VMIN Voltage

LS Voltage

3.0V

COSC

1.0V

0V

Lock Protection Linear

Start

100%

VMIN Setting Speed

ON-Duty

0%

Figure 11. Operating Diagram 3 of AM4967 (Linear Start, VPWM Voltage>VMIN Voltage, Note 4)

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

Operating Diagram (Continued)

VPWM Voltage

VMIN Voltage

0V

Lock Protection

RD

High Level Low Level

100%

ON-Duty

0%

LS Voltage

Linear

Start

3.0V

COSC

1.0V

VMIN Setting Speed

Figure 12. Operating Diagram 4 of AM4967 (Note 4)

Note 4: The inclination of LS voltage is adjusted between V
to be 0.1µF to 1.0µF.

LS

and V

according to the capacitance which is recommended

REF

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

Typical Application

Power In

PWM In

More than

1µF/25V

More than

1µF/25V

Hall

OUT1 OUT2

13

VREF

9

HIN-

10

HIN+

12

LS

5

VMIN

6

VPWM

3
VCC

AM4967

OUT1B

OUT2B

FG/RD

CS

OUT1

OUT2

GND

1kΩ

100Ω

10kΩ~
100kΩ

8

4

16

15

1

2

14

Oct. 2008 Rev. 1. 2

220pF

(f=30kHz)

COSC

7

11

CT

0.47µF

Figure 13. Typical Application of AM4967 (VCC=12V)

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Data Sheet

ADJUSTABLE-SPEED SINGLE-PHASE FULL-WAVE PRE-DRIVER FOR MOTOR AM4967

Mechanical Dimensions

SSOP-16 Unit: mm(inch)

3.800(0.150)

4.000(0.157)

0.800(0.031)

Φ

0.900(0.035)1.000(0.039)

0.200(0.008)

0.300(0.012)

0.635(0.025)
BSC

0.100(0.004)

0.250(0.010)

o

7

o

7

4.700(0.185)

5.100(0.201)

1.350(0.053)

1.750(0.069)

0.400(0.016)

5.800(0.228)

6.200(0.244)

o

8

o

8

0.200(0.008)

0.250(0.010)

0.650(0.026)

0.750(0.030)

SEE

DETAIL A

0.150(0.006)

0.250(0.010)

1.350(0.053)

1.550(0.061)

1.270(0.050)

R0.150(0.006)

0.020(0.001)

0.050(0.002)

o

0

o

8

DETAIL A

0.250(0.010)

R0.150(0.006)

Oct. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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