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Data Sheet

Three Phase Direct PWM Sensorless Motor Driver AM9800

Sep. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

General Description

The AM9800 is a direct PWM driver IC designed for

three-phase brushless motors. Also, by using highly

silent PWM drive, switching current of the phase

with a smooth slope reduces the sound of slewing

motor, and makes high-efficiency drive a reality by a

synchronous commutation.

The device is build-in lock protection. When the fan

is locked, the device will enter the lockup protection

mode. It is also equipped with thermal shutdown

function and forward or reverse rotation selection. In

normal operation, supply current is less than 2mA,

but in PWM=0 mode it is just around 20µA.

The AM9800 is available in SSOP-16 package.

Features

• Speed Controllable by PWM Input Signal

• Sensorless Drive

• Soft Switched Drive

• Build-in Forward/Reverse Switching Circuit

• Power Saving Function in a Stopped State: 2mA

and PWM=0 State: 20µA

• Build-in Current Limiter Circuit

• Build-in Lock Protection and Auto-restart

• Built-in Over Current Protection

• Built-in Thermal Shutdown Circuit

• ESD Rating: 4000V (Human Body Model)

300V (Machine Model)

Applications

• CPU Cooler Fan in Notebook Personal

Computers

Figure 1. Package Type of AM9800

SSOP-16

Summary of content (11 pages)

PAGE 1
Data Sheet Three Phase Direct PWM Sensorless Motor Driver General Description Features The AM9800 is a direct PWM driver IC designed for three-phase brushless motors. Also, by using highly silent PWM drive, switching current of the phase with a smooth slope reduces the sound of slewing motor, and makes high-efficiency drive a reality by a synchronous commutation. • • • • • • • • • • The device is build-in lock protection. When the fan is locked, the device will enter the lockup protection mode.
PAGE 2
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Pin Configuration GS Package (SSOP-16) 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 Figure 2.
PAGE 3
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Functional Block Diagram Figure 3. Functional Block Diagram of AM9800 Sep. 2012 Rev. 1.
PAGE 4
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Ordering Information AM9800 - G1: Green Circuit Type TR: Tape & Reel Blank: Tube Package GS: SSOP-16 Package Temperature Range SSOP-16 -30 to 95°C Part Number Marking ID Packing Type AM9800GS-G1 AM9800GS-G1 Tube AM9800GSTR-G1 AM9800GS-G1 Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
PAGE 5
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Recommended Operating Conditions (TA=25°C) Parameter Symbol Min Max Unit Supply Voltage VCC 2.2 6 V Operating Temperature TOP -30 95 °C Electrical Characteristics VCC =5V, TA=25°C, unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit Supply Current 1 ICC1 VPWM=VCC 2 2.5 mA Supply Current 2 ICC2 VPWM=0V 20 50 µA VG Output Voltage VG 9.7 V Upper Transistor Resistance RONH IOUT=0.
PAGE 6
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Typical Performance Characteristics 25 2.5 o o TA=25 C VPWM=VCC VPWM=0V 20 Supply Current (µA) Supply Current (mA) 2.0 TA=25 C 1.5 1.0 15 10 5 0.5 0 0.0 0 1 2 3 4 5 0 6 1 2 3 4 5 6 Supply Voltage (V) Supply Voltage (V) Figure 4. Supply Current vs. Supply Voltage Figure 5. Supply Current vs.
PAGE 7
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Typical Application 1 2 3 1 F 4 WO VO RF UO CPC VCC CP 16 15 RF 0.5 14 13 0.1 F COM 0.1 F 5 COMIN 1000pF 6 7 2200pF 8 VG PWM 11 FIL OSC FG SGND F/R PWM 12 10 9 PWM Control Signal f=20k to 50kHz RFG VFG 10k FG Output Figure 8. Typical Application of AM9800 Sep. 2012 Rev. 1.
PAGE 8
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Application Information 1. Reverse Connection of Power Supply Connector Reverse connection of power supply connector may break IC. Some methods such as inserting a diode between power supply and VCC terminal can be taken to avoid the reverse connection destruction. VUO 5V/div VVO 5V/div VWO 5V/div IWO 100mA/div 2.
PAGE 9
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Application Information (Continued) 11．Position Detector Comparator Circuit for Rotor The position detector comparator circuit for the rotor is a comparator for detecting rotor positional information with the back EMF signal generated when the motor rotates. The IC determines the timing at which the output block applies current to the motor based on the position information obtained here.
PAGE 10
Data Sheet Three Phase Direct PWM Sensorless Motor Driver AM9800 Mechanical Dimensions SSOP-16 Unit: mm(inch) 3.800(0.150) 4.000(0.157) 7° 0.200(0.008) 0.300(0.012) 7° 0.635(0.025) BSC 4.700(0.185) Φ 5.100(0.201) 0.800(0.031) 0.100(0.004) 1.000(0.039) 0.900(0.035) 0.250(0.010) 1.350(0.053) 1.750(0.069) 0.400(0.016) 1.270(0.050) 5.800(0.228) 6.200(0.244) SEE DETAIL A 1.350(0.053) 1.550(0.061) 8° 0.150(0.006) 0° R0.150(0.006) 0.250(0.010) 8° 0.250(0.010) R0.150(0.006) 8° 0.650(0.
PAGE 11
BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein.