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LB1696 Fiches technique(PDF) 6 Page - Sanyo Semicon Device |
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LB1696 Fiches technique(HTML) 6 Page - Sanyo Semicon Device |
6 / 9 page 1. Hall input circuit The Hall input circuit is a differential amplifier with hysteresis (32 mV typ). The operating DC level must be within the common mode input voltage range (1.5 V to VCC – 1.8 V). An input level that is at least three times greater than the hysteresis (from 120 to 160 mVp-p) is recommended to be independent of noise, etc. If the handling capability needs to be considered in noise evaluation, etc., connect a capacitor (about 0.01 µF) between the Hall inputs IN + and IN–. 2. Protectors 2-1. Reduced voltage protector If VCC drops below the prescribed voltage (VLVSD), the output transistor on the sink side turns off. This protector prevents malfunction which may occur when VCC is reduced. 2-2. Thermal shutdown protector If the junction temperature exceeds the prescribed temperature (TSD), the output transistor on the sink side turns off. This protector prevents the IC from being damaged by heat. Thermal design must be such that no operation is performed in other modes than abnormality. 3. FG output circuit IN1, IN2, and IN3 Hall input signals are composited and wave shaped to be output. FG1 has the same frequency as for Hall input, while FG2 3-fold as many. 4. Forward/reverse controller No forward/reverse (F/R) switching is assumed to be performed during motor running period. If F/R switching is performed during motor running period, through current flows to output and ASO needs to be considered. It is recommended that F/R switching be performed when the VM power supply is off (in motor stop mode). 5. VCC and VM power supplies If the supply voltage (VCC,VM) rise rate is fast when power is applied, through current flows to output and ASO needs to be considered. The supply voltage rise rate must be such that ∆V CC/∆t = 0.04 V/µs or less and ∆VM/∆t = 0.16 V/µs or less. The desirable order of applying power is VCC on first and then VM on. The desirable of turning off power supply is VM off first and then VCC off after motor stop. If, after VM is turned off, VCC is turned off during motor’s inertial running, some types of motors have a possibility that VM voltage rises, exceeding the withstand voltage. Because the LB1696 has a regulator built in, it can be used with a single power supply (VM power supply only). In this case, VCC (5.2 V typ.) can be supplied by connecting an external transistor (NPN) and resistor to the VREG pin. If the regulator is not used, the VREG pin must be left open or connected to GND. 6. Power supply stabilization capacitor Great fluctuations in the VCC line may cause the reduced-voltage protector, etc. to malfunction. A capacitor (of several µF) needs to be connected to the VCC line (between VCC and GND) for stabilization. Since a large switching current flows in the line, wiring inductance componenet etc. fluctuates. Because there are also fluctuations in the GND line, a capacitor needs to be connected to the VM line (between VM and GND) for stabilization, thus preventing malfunction and keeping withstand voltage from being exceeded. Especially when the routing of wiring (VM,VCC, or GND) is long, be sure to connect capacitors with adequate capacity for power line stabilization. LB1696 No.5244-6/9 |
Numéro de pièce similaire - LB1696 |
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Description similaire - LB1696 |
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