AM4961GHTR-E1

Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER General Description 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 TSSOP-20(EDP) and HTSSOP-14 packages. AM4961 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 TSSOP-20(EDP) HTSSOP-14 Figure 1. Package Types of AM4961 Jun. 2008 Rev. 2. 2 1 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER Pin Configuration G Package (TSSOP-20(EDP)) AM4961 PGND PGND PGND OUT2 VCC VMIN VPWM COSC FG RD 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 PGND PGND PGND OUT1 GND CT VREF HINHB HIN+ Jun. 2008 Rev. 2. 2 2 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER Pin Configuration (Continued) AM4961 GH Package (HTSSOP-14) PGND PGND OUT2 VCC VMIN VPWM COSC FG RD 1 2 3 4 5 6 7 14 13 12 11 10 9 8 OUT1 GND CT VREF HINHB HIN+ Figure 2. Pin Configuration of AM4961 (Top View) Jun. 2008 Rev. 2. 2 3 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER Pin Description Pin Number Pin Name TSSOP-20(EDP) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 HTSSOP-14 PGND PGND PGND OUT2 VCC VMIN VPWM COSC FG RD HIN+ HB HINVREF CT GND OUT1 PGND PGND PGND Power ground Power ground Power ground Driver output 2 Power supply Minimum duty setting Adjustable Input Oscillator capacitor Rotation speed indicator Rotation/lock state indicator Hall sensor input + Hall sensor bias regulator Hall sensor input Reference voltage regulator Lock and rotation setting capacitor terminal Ground for control circuit Driver output 1 Power ground Power ground Power ground Function AM4961 Jun. 2008 Rev. 2. 2 4 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER Functional Block Diagram AM4961 9 (6) COSC 8 (5) FG Oscillation Circuit Thermal Shutdown VPWM VMIN 7 (4) 10 (7) 6 (3) RD Pre-driver VREF 14 (11) Voltage Reference 5 (2) VCC HB HIN+ HIN- 12 (9) Hall Bias Control Circuit 4 (1) 11 (8) 13 (10) OUT2 Hysteresis Amp Lock Shutdown and Auto Restart 15 (12) 16 (13) 1, 2, 3, 18, 19, 20 17 (14) OUT1 CT A (B) A for 20-pin GND PGND B for 14-pin Figure 3. Functional Block Diagram of AM4961 Jun. 2008 Rev. 2. 2 5 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE FULL WAVE DIRECT PWM MOTOR DRIVER Truth Table HINH L H L H L H L HIN+ L H L H L H L H L H H L H L COSC (Note 1) CT OUT1 H L OFF L H OFF OFF OFF OUT2 L H L OFF OFF H OFF OFF FG L OFF L OFF L OFF L OFF OFF Lock Protection L Rotation (Recirculate) Rotation (Drive) RD Mode AM4961 Note 1: VOSC (H) >VPWM, VOSC (L)