AM4964GTR-G1 Diodes Incorporated

EXPOSED PAD A Product Line of Diodes Incorporated AM4964 SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER Description Pin Assignments The AM4964 is highly integrated feature rich single phase Brushless (Top View) Direct Current (BLDC) full wave motor driver with combined PWM and temperature speed control function for fans, blowers and extractors. NC 1 20 NC For system flexibility, the motor speed can be controlled by an external PWM signal and temperature sensed by Thermal resister at PGND 2 19 OUT1 the same time. Based on external input PWM and temperature OUT2 3 18 TA signals, the AM4964 adjusts the output PWM duty cycle. If the input PWM duty is constant, the output PWM duty varies with temperature VCC 4 17 TH sensed by Thermal resister sensor between the low and high VMIN 5 SGND 16 temperature corners. If the temperature signal is constant, the output duty varies with the external input PWM duty. The low and high PWM 6 CT 15 temperature corners and the output PWM duty gap between these RADJ temperature corners are adjustable CF 7 14 FG 8 13 IN- To help protect the motor coil, the AM4964 provides a rotor lock protection which shuts down the output if rotor lock is detected. The RT 9 12 HB device automatically re-starts when the rotor lock is removed. TL IN+ 10 11 AM4964 provides a tachometer output Frequency Generator (FG). The FG output is the magnetic change frequency. The AM4964 is available in TSSOP-20EP package. TSSOP-20EP Features Applications Flexible Speed Control Options CPU Cooler Fan in PC Combined PWM+Thermistor Speed Control Brushless DC Motor Driver PWM Speed Control DC Voltage Speed Control Adjustable Low and High Temperature Corners Full Speed When Thermal Resistor is Shorted Adjustable Output Duty Gap between High and Low Temperature when 100% PWM Input Built-in oscillator No external capacitor Built-in Minimal Speed Setup Circuit Alpha Slope Adjustable Rotation Speed Indicator (FG) Built-in Temperature Control Circuit Built-in Thermal Shutdown Circuit Lock Protection and Auto-restart Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See A Product Line of Diodes Incorporated AM4964 Typical Applications Circuit L1 20 1 NC NC D3 2 19 PGND OUT1 D2 R7 3 18 TA OUT2 VCC D1 V+ R9 4 17 VCC TH V+ 16 SGND R1 C2 0.47F C1 5 15 R5 VMIN CT 1F 14 R2 RADJ 6 R3 PWM 13 R6 IN- 7 CF 12 Hall HB R4 8 FG 11 IN C3 + 9 1 F RT RT 10 TL R8 2 of 21 AM4964 June 2014 Diodes Incorporated www.diodes.com Document number: DS37241 Rev. 2 - 2 NEW PRODUCT AM4964