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SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961

Data Sheet

May. 2011 Rev. 2. 4 BCD Semiconductor Manufacturing Limited

General Description

The AM4961 is a full wave driver IC with PWM con-

trol function. It is used for single phase motor and is

capable of speed control by changing output duty

cycle.

The AM4961 is available in SSOP-16 and HTSSOP-

14 packages.

Features

· Built-in Hall Bias Circuit

· Built-in PWM Speed Control Circuit

· Built-in Minimal Speed Setup Circuit

· Rotation Speed Indication (FG)

· Rotation or Lock State Indication (RD)

· Built-in Thermal Shutdown Circuit

· Lock Protection

· Output Current Limit

Application

· CPU Cooler Fan in PC

· Brushless DC Motor Driver

Figure 1. Package Types of AM4961

SSOP-16

HTSSOP-14

Summary of content (14 pages)

PAGE 1
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER General Description Features The AM4961 is a full wave driver IC with PWM control function. It is used for single phase motor and is capable of speed control by changing output duty cycle. · · · · · · · · The AM4961 is available in SSOP-16 and HTSSOP14 packages.
PAGE 2
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Pin Configuration GS Package (SSOP-16) OUT2 1 16 PGND NC 2 15 OUT1 VCC 3 14 GND VMIN 4 13 CT VPWM 5 12 VREF COSC 6 11 HIN- FG 7 10 HB RD 8 9 HIN+ GH Package (HTSSOP-14) PGND PGND OUT2 1 14 OUT1 VCC 2 13 GND VMIN 3 12 CT VPWM 4 11 VREF COSC 5 10 HIN- FG 6 9 HB RD 7 8 HIN+ Figure 2. Pin Configuration of AM4961 (Top View) May. 2011 Rev. 2.
PAGE 3
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Pin Description Pin Number Pin Name Function HTSSOP-14 SSOP-16 1 1 OUT2 Driver output 2 2 NC No connection 2 3 VCC Power supply 3 4 VMIN Minimum duty setting 4 5 VPWM Adjustable Input 5 6 COSC Oscillator capacitor 6 7 FG Rotation speed indicator 7 8 RD Rotation/lock state indicator 8 9 HIN+ 9 10 HB 10 11 HIN- Hall sensor input - 11 12 VREF Reference voltage regulator 12 13 CT 13 14 GND
PAGE 4
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Functional Block Diagram COSC VPWM VMIN 6 (7) 5 (6) Oscillation Circuit FG Thermal Shutdown 4 (5) 7 (8) 3 (4) RD Pre-driver VREF HB HIN+ HIN- 11 (12) 9 (10) Voltage Reference 2 (3) VCC Control Circuit Hall Bias 1 (1) 8 (9) OUT2 10 (11) Hysteresis Amp Lock Shutdown and Auto Restart 12 (13) CT A (B) A for 14-pin 14 (15) OUT1 (16) 13 (14) GND PGND B for 16-pin Figure 3. Functional Block Diagram of AM4961 May.
PAGE 5
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Truth Table HIN- HIN+ H L L H H L L H H L L COSC (Note 1) H L L H H H L L H CT H L OUT1 OUT2 FG H L L L H OFF OFF L L L OFF OFF H OFF L OFF H OFF OFF OFF L OFF OFF OFF RD Mode Rotation (Drive) L Rotation (Recirculate) OFF Lock Protection Note 1: VOSC (H) >VPWM, VOSC (L)
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Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Absolute Maximum Ratings (Note 2) Parameter Symbol Value Unit Supply Voltage VCC 18 V Output Current IOUT 1.
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Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Electrical Characteristics (VCC=12V, TA=25oC, unless otherwise specified.) Parameter Quiescent Current Symbol Conditions Min Typ Max Unit IQ1 Lock Off 10.2 15 18.76 IQ2 Lock On 5.38 8 10.55 5.8 6 6.2 V mA VREF Voltage VREF IREF=5mA Output Saturation Voltage at High Side VSATH ISOURCE=200mA 1.0 1.17 V Output Saturation Voltage at Low Side VSATL ISINK=200mA 0.2 0.
PAGE 8
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Typical Performance Characteristics 20 20 TA=25 C Rotation Mode Rotation Mode 16 12 12 IQ1 (mA) IQ1 (mA) 16 O VCC=12V 8 8 4 4 0 -50 0 0 50 100 150 200 4 6 8 10 O 12 14 16 18 VCC (V) TA ( C) Figure 4.Quiescent Current vs. Ambient Temperature Figure 5. Quiescent Current vs. Supply Voltage 2.0 2.0 VCC=12V VCC=12V 1.5 VSATL (V) VSATH (V) 1.5 1.0 0.5 0.5 0.0 1.0 0.
PAGE 9
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 1.2 1.2 1.0 1.0 0.8 0.8 PD (W) PD (W) Typical Performance Characteristics (Continued) 0.6 0.4 0.2 0.6 0.4 Package: SSOP-16 No External Heatsink 0.2 0.0 -20 0 20 40 60 80 90 100 0.0 120 O TA ( C) Package: HTSSOP-14 No External Heatsink -20 0 20 40 60 80 90 100 O TA ( C) Figure 9. Power Dissipation vs. Ambient Temperature Figure 8. Power Dissipation vs. Ambient Temperature May. 2011 Rev. 2.
PAGE 10
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Operating Diagram VPWM adjustable Voltage Lowest speed setting voltage fOSC=25kHz (COSC=100pF) Vosc VMIN Voltage COSC Output Vosc Low Speed PWM Variable High Speed VCC 0V FG Output Figure 10. Operating Diagram of AM4961 (Note 5) Note 5: 1. Low Speed Setting Mode M When VPWM voltage is higher than VMIN pin voltage, motor speed is settable by VMIN pin voltage.
PAGE 11
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Typical Application D1 VCC R1 27k C1 1μF or greater L1 AM4961 R2 10k 1 (1) 2 (3) 3 (4) R4 39k 4 (5) R6 330k PWM 5 (6) R3 7.5k 6 (7) 7 (8) OUT2 OUT1 VCC GND VMIN CT VPWM 14 (15) 13 (14) 12 (13) VREF 11 (12) HIN- 10 (11) COSC FG HB RD PGND HIN+ 9 (10) 8 (9) Hall C4 0.47μF (16) R7 100k C2 0.33μF R8 R5 C3 100pF 68k 100k Figure 11.
PAGE 12
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 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) 5.100(0.201) Φ 0.800(0.031) 1.000(0.039) 0.100(0.004) 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) 8° SEE DETAIL A 1.350(0.053) 1.550(0.061) 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 13
Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER AM4961 Mechanical Dimensions (Continued) HTSSOP-14 Unit: mm(inch) 1. 470(0. 058) 1. 570(0. 062) 6. 350(0. 250) 6. 550(0. 258) Φٛ 1. 450(0. 057) 1. 550(0. 061) 6. 200(0. 244) 6. 600(0. 260) 4. 300(0. 169) 4. 500(0. 177) SEE DETAIL A Φ ٛ 0. 750(0. 030) 0. 850(0. 033) 0.200(0.008) or 1.480(0.058) 0.280(0.011) or 1.610(0.063) 0.100(0.004) 0.190(0.007) 0. 650(0. 026) BSC 1. 300(0. 051) BSC 1. 200(0. 047) MAX 0. 340(0. 013) 0. 200(0.
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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.