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Data Sheet

Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789

Oct. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

General Description

The AM9789 is a single-phase, full wave motor

driver suited for DC fan motor, and its speed is

controlled by PWM input signal. It is suitable for

both game machine and CPU cooler which need

silent drivers. It features lock protection, thermal

shutdown, PWM control, low noise and so on.

The AM9789 is available in MSOP-8, MSOP-10

DFN-3×3-8 and DFN-3×3-10 packages.

Features

• BTL Output Single-phase Full-wave Linear

Driver

• Silent Driver

• Low Supply Current (Normal Operation，Less

than 4mA)

• Low Standby Current (PWM=0 Duty) @

Supply Current Less than 200µA

• Speed Controllable by PWM Input Signal

• Built-in Quick Start Function

• Built-in Lock Protection and Auto Restart

Function

• Built-in Hall Bias Circuit

• Built-in FG Output

• Built-in Thermal Shutdown Circuit

• Built-in Over Current Protection Circuit

Applications

• Silent Fan Motors

Figure 1. Package Types of AM9789

MSOP-8 MSOP-10 DFN-3×3-8 DFN-3×3-10

Summary of content (18 pages)

PAGE 1
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor General Description Features The AM9789 is a single-phase, full wave motor driver suited for DC fan motor, and its speed is controlled by PWM input signal. It is suitable for both game machine and CPU cooler which need silent drivers. It features lock protection, thermal shutdown, PWM control, low noise and so on. • The AM9789 is available in MSOP-8, MSOP-10 DFN-3×3-8 and DFN-3×3-10 packages.
PAGE 2
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Pin Configuration M8 Package (MSOP-8) MM Package (MSOP-10) 1 8 2 7 3 6 4 5 1 10 2 9 3 8 4 7 5 6 DN8 Package (DFN-3×3-8) DN Package (DFN-3×3-10) Pin 1 Mark Pin 1 Mark 1 8 2 7 3 6 4 5 1 10 2 9 3 8 4 7 5 6 Figure 2.
PAGE 3
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Functional Block Diagram Figure 3. Functional Block Diagram of AM9789 Oct. 2012 Rev. 1.
PAGE 4
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Ordering Information AM9789 - G1: Green Circuit Type TR: Tape & Reel Package M8: MSOP-8 MM: MSOP-10 DN8: DFN-3×3-8 DN: DFN-3×3-10 Package Temperature Range MSOP-10 Part Number Marking ID Packing Type AM9789MMTR-G1 9789MM-G1 Tape & Reel AM9789M8TR-G1 9789M8-G1 Tape & Reel DFN-3×3-8 AM9789DN8TR-G1 B6E Tape & Reel DFN-3×3-10 AM9789DNTR-G1 BFD Tape & Reel MSOP-8 -40 to 105°C BCD Semiconductor's Pb-free product
PAGE 5
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Absolute Maximum Ratings (TA=25°C, Note 1) Parameter Symbol Value Unit Supply Voltage VCC 10 V Output Current IOUT 1 A Output Voltage VOUT 10 V HB Output Current IHB 10 mA FG Output Voltage VFG 10 V FG Output Sink Current IFG 10 mA Operation Temperature TOP -40 to 125 °C Storage Temperature Range TSTG -55 to 150 °C Lead Temperature (Soldering 10s) TLEAD 260 °C Thermal Resistance Ambient) (Ju
PAGE 6
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Electrical Characteristics VCC =5V, TA=25°C, unless otherwise specified. Parameter Symbol Conditions Min Typ Max Unit 2 4 mA 130 200 µA 1.1 1.3 1.5 V Operation Current ICC1 Rotation Mode Standby Current ICC2 VPWM=0 HB Pin Output Voltage VHB IHB=5mA Lock Detection ON Time tON 0.3 0.4 0.
PAGE 7
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Typical Performance Characteristics 4.0 200 3.5 Operation Mode VPWM=VCC 150 Supply Current (µA) Supply Current (mA) 3.0 2.5 2.0 1.5 1.0 Standby Mode VPWM=0V 100 50 0.5 0.0 0 1 2 3 4 5 0 6 0 1 2 Supply Voltage (V) 3 4 5 6 Supply Voltage (V) Figure 4. Supply Current vs. Supply Voltage (VPWM=VCC) Figure 5. Supply Current vs.
PAGE 8
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Typical Performance Characteristics (Continued) 2000 Power Dissipation (mW) Package: DFN-3x3-10/DFN-3x3-8 1500 1000 500 0 -40 -20 0 20 40 60 80 100 120 140 o Ambient Temperature ( C) Figure 8. Power Dissipation vs. Temperature (DFN) Oct. 2012 Rev. 1.
PAGE 9
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Truth Table L L H INPUT HIN+ H L L H H L - - HINL H H Oct. 2012 PWM H L L OUTPUT OUT2 L H L L L L OFF OUT1 H L L L L L OFF Rev. 1.
PAGE 10
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Typical Application For MSOP-10 package Oct. 2012 Rev. 1.
PAGE 11
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Typical Application (Continued) For MSOP-8 package Figure 9. Typical Applications of AM9789 (Note 2) Note 2: D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged reversed. C1=1µF/10V typical. R1 and R2 should be fine tuned based on system design. They can be removed according to the system requirements. Zener diode (D2) is an optional choice. RFG=10kΩ typical. Oct. 2012 Rev. 1.
PAGE 12
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Application Information the heat to the ambient air. 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. 6.
PAGE 13
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor Application Information (Continued) operated with the PWM pin open, the built-in resistor enables the PWM pin to change to high-level voltage and the motor speed rises to full speed. When the PWM pin is fixed at low-level voltage, the motor decelerates, and after the motor stops, it enters “Power Saving Mode”. Figure 12 shows a rotating fan’s waveform at PWM Mode. Figure 13 shows Lock Mode Waveform at PWM input condition in the same fan.
PAGE 14
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Mechanical Dimensions MSOP-10 Unit: mm(inch) 0.180(0.007) 0.280(0.011) 0.500(0.020) TYP 2.900(0.114) 3.100(0.122) 4.750(0.187) 5.050(0.199) 0.400(0.016) 0.800(0.031) 0.090(0.004) 0.230(0.009) 0.750(0.030) 0.950(0.037) 0.820(0.032) 1.100(0.043) 0.150(0.006) 2.900(0.114) 3.100(0.122) 0.020(0.001) 0° 6° Note: Eject hole, oriented hole and mold mark is optional. Oct. 2012 Rev. 1.
PAGE 15
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Mechanical Dimensions (Continued) MSOP-8 Unit: mm(inch) 0.300(0.012)TYP P 0.150(0.006)TY 2.900(0.114) 3.100(0.122) 4.700(0.185) 5.100(0.201) 0.410(0.016) 0.650(0.026) 0.650(0.026)TYP 0° 6° 0.760(0.030) 0.970(0.038) 0.200(0.008) 2.900(0.114) 3.100(0.122) 0.000(0.000) 0.800(0.031) 1.200(0.047) ` Note: Eject hole, oriented hole and mold mark is optional. Oct. 2012 Rev. 1.
PAGE 16
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Mechanical Dimensions (Continued) DFN-3×3-8 Unit: mm(inch) 0.180(0. 007) 0.300(0. 012) 2.900(0. 114) 3.100(0. 122) 0.650(0.026) BSC N8 N5 0.375(0. 015) 0.575(0. 023) 2.900(0. 114) 1. 400(0.055) 3.100(0. 122) 1.600(0.063) 2.200(0. 087) 2. 400( 0. 094) PIN#1 IDENTIFICATION See DETAIL A Pin 1 Mark N4 N1 DETAIL A 0.153(0. 006) 0.253(0. 010) 0.000(0. 000) 0.700(0. 028) 2 0.050(0. 002) 1 2 1 2 1 0.800(0.
PAGE 17
Data Sheet Single Phase Full-wave Motor Driver for Silent Fan Motor AM9789 Mechanical Dimensions (Continued) DFN-3×3-10 Unit: mm(inch) 1.600(0. 063) 0.300(0.012) 1.800(0. 071) 0.500(0. 020) 0.500(0.020) 2.900(0. 114) TYP 3.100(0.122) N6 N10 2.300(0.090) 2.500(0.098) 2.900(0. 114) PIN #1 IDENTIFICATION See DETAIL A 3.100(0. 122) Pin 1 Mark N5 N1 0.200(0. 008) 0.700(0. 028) 0.800(0. 031) 0.000(0. 000) 0.300(0. 012) DETAIL A 0.050(0.002) 0.153(0. 006) 0.253(0.
PAGE 18
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.