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參數(shù)資料
| 型號(hào)： | TDA5345HT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 5 V spindle & VCM driver combo |
| 中文描述： | DISK DRIVE MOTOR CONTROLLER, 2 A, PQFP64 |
| 封裝： | LOW PROFILE, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 2/44頁 |
| 文件大?。?/td> | 213K |
| 代理商： | TDA5345HT |
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1999 June 10
2
Philips Semiconductors
Preliminary specification
5 V spindle & VCM driver combo
TDA5345HT
FEATURES
Single chip voice coil and spindle motor drivers:
Complementary outputs (Nmos & Pmos): No step-up converter needed
On-chip isolation switch to allow synchronous rectification at power-down
Suited for ramp load operation
Register based architecture: on-chip serial interface
Temperature shut down protection
Linear 3.3 V regulator using one external NPN transistor
Power monitor circuitrymonitoring the 5 V supply
1 axis shock sensor amplifier
Switched capacitor regulator (-3 V) using 2 external capacitors and 2 external shottky diodes
All main internal functions can be independently put in Sleep mode
Small low profile package: TQFP64 (1.2 mm high).
Spindle motor driver:
High efficiency drivers: 1.5
Max
0.62 Amp capability, full wave (bipolar) drive
Internal current mirrors to measure the motor curren
Controlled fly-back pulse slopes, programmable through the serial interface
Active fly-back pulse limitation, using the Power MOS instead of diodes
Internal digital timing to control the commutations by back-EMF sensing (Start-up & running)
Internal speed loop combining FLL and PLL
Start-up current control by an internal 6-bit DAC (shared with the VCM loop).
Voice coil motor (VCM) driver:
High efficiency drivers: 1.5
Max (without the external sense resistor); 0.4 Amp capability
External sense resistor to accurately control the VCM current
True AB Class linear amplifier with no crossover distortion
Internal 12-bit DAC to control the VCM transconductance input voltage
Internal 6-bit DAC to cancel the VCM loop offsets
Active fly-back pulse limitation, using the Power transistors instead of diodes
3-step programmable retract function activated by either the serial port or the power monitor circuitry
Back-EMF amplifier to monitor the actuator speed when ramp loading.
Power Monitor:
Monitors the 5 V power supply
Power fault output (battery too low); threshold = 4.2 V
Power on Reset output; threshold = 4.1 V (Vdd5)
Threshold accuracy: +/-3%.
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