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AM9468 Datasheet

SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER

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Green AM9468
SINGLE PHASE FULL WAVE
DIRECT PWM MOTOR DRIVER
Description
Pin Assignments
The AM9468 is a high performance ultra low noise single phase
(single-coil) brushless direct current (BLDC) fan and motor driver. The
integrated full-bridge driver output stage uses a BTL linear driver
architecture to minimize audible switching noise and electromagnetic
interference (EMI) providing a low noise solution.
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 AM9468 adjusts the output duty cycle.
To help protect the motor coil, the AM9468 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. In
case of over voltage, the device shuts down the output drive and
enters standby mode to help prevent over voltage stress on the coil.
Over temperature shutdown provides thermal protection for the
device.
(Top View)
OUT1 1
VDD
REGH
2
3
5VREG 4
VCONT 5
RMI 6
FG 7
16 OUT2
15 RF
14 GND
13 PWM
12 CPWM
11 HIN-
10 HB
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. Additionally,
a rotor lock detect output is provided by open-drain RD pin.
The AM9468 is available in power capable low profile TSSOP-16
package.
RD 8
TSSOP-16
9 HIN+
Features
Single-Phase Full Wave BLDC Fan/Motor Drive with BTL Output
(BTL Amplifier Gain = 49dB)
Low Noise Architecture
Wide Operating Voltage Range: 2.4V to 18V
PWM Speed Control with External PWM Input
DC Voltage Speed Control by Adjusting VCONT and RMI
Voltage
Hall Bias Output: VHB = 1.25V
Built-in Quick Start Circuit
Lock Protection with Automatic Restart
Frequency Generator (FG) Output
Rotor Lock Detection (RD) Output
Current Limit Circuit
RF Defines The Current Limit;
RF = 1Ω will Achieve 250mA Current Limit
Thermal Shut-Down (TSD) Circuit
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
9V/ 12V / 15V BLDC Cooling Fans and Motors
CPU Cooling Fans for Notebooks and Desktop BLDC Fans
Instruments Cooling Fans
Medium Voltage/ Low Power BLDC Motors
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
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
AM9468
Document number: DS38663 Rev. 1 - 2
1 of 16
www.diodes.com
May 2016
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AM9468 Datasheet

SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER

No Preview Available !

Typical Applications Circuit (Notes 4 and 5 )
Motor Coil
AM9468
SYSTEM
POWER
D1
C1 Dz
1 OUT1
OUT2 16
2 VDD
RF 15
AM9468
3 REGH
GND 14
4 5VREG
PWM 13
5 VCONT
CPWM 12
6 RMI
HIN- 11
7 FG
HB 10
8 RD
HIN+ 9
RF
CPWM
PWM signal for
speed control
R1
Hall
Typical Applications Circuit for PWM Speed Control
Motor Coil
SYSTEM
POWER
D1
C1 Dz
VPWM
1 OUT1
OUT2 16
2 VDD
RF 15
AM9468
3 REGH
GND 14
4 5VREG
PWM 13
5 VCONT
CPWM 12
6 RMI
HIN- 11
7 FG
HB 10
8 RD
HIN+ 9
RF
CPWM
R1
Hall
Typical Applications Circuit for VCONT/RMI Control
Notes:
4. C1 is for power stabilization and to strengthen the noise immunity and should be as close to the VDD pin as possible. The recommended value for C1 is
1µF typically. The value of capacitor can be optimized depending on the operating mode, motor voltage and the motor current. For PWM speed control
mode, with datasheet current capability, the recommended capacitor value is 1µF. The value of the C1 should be checked in the motor design and route
in its operating conditions if it is reduced or increased from the recommended value of 1µF.
5. Diode D1 is for the reverse connection protection. In addition to power stabilization and noise immunity, C1 also absorbs regenerative motor spikes.
Depending on the amount of regenerative voltage spike, value of C1 needs to be adjusted. The zener diode Dz is used to clamp the regenerative
voltage spike from the motor operation to safe level when reverse blocking diode D1 is used. If reverse blocking diodes is not used, the use of zener
clamp Dz depends on the supply voltage capability to effectively sink the regenerative energy and voltage spike. The value of C1 and the requirement
Dz needs to be verified on each application design.
AM9468
Document number: DS38663 Rev. 1 - 2
2 of 16
www.diodes.com
May 2016
© Diodes Incorporated


Part Number AM9468
Description SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER
Maker Diodes
Total Page 16 Pages
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