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Содержание PMP15034

Страница 1: ...uces two driving circuit of piezoelectric sounder With PWM signal from MCU one circuit provides rectangular wave driving voltage between 0 V and 28 V the other circuit provides 15 V rectangular wave driving voltage The block diagram of the 28 V driver circuit is shown in Figure 1 The output voltage of the TLV61046A is set to 28V A PWM signal from MCU drives Q1 to control the voltage across the pie...

Страница 2: ... recommended operating frequency of the sounder which is 4KHz in this reference design The duty cycle of the PWM and the R2 resistance impact the sound press of TS1 They also impact the power loss of the driver circuit because the current flows through R2 to ground when Q1 turns on The power loss of R2 is calculated by equation 1 where D is duty cycle of the input PWM signal PR2 VOUT 2 D R2 1 Foll...

Страница 3: ...ular Waveform Driver Circuit The current flowing through R5 to ground increases the power loss of the circuit It is suggested to minimize the duty cycle of the PWM signal if the sound press meets the requirement The R6 in parallel with LS2 discharge the DC voltage at LS2 to zero after the TLV61046A is disabled Test Result Figure 5 shows the startup waveform the 28 V circuit by EN signal The device...

Страница 4: ...the two output voltage ramps up to target value within 7ms VOUT 5V div EN 2V div Double VOUT 10V div Figure 7 Startup at VIN 3 3V Figure 8 shows the operating waveform with 4 KHz 30 duty PWM input when VIN 3 3V The rising and falling time is very short because the totem pole has strong driving capability Driving Voltage 10V div PWM 5V div Figure 8 Operating Waveform with 4 KHz PWM ...

Страница 5: ...s are subject to change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of these resources is prohibited No license is granted to any other TI intellectual property right or to any third party intellectual property right TI disclaims responsibility for and you wi...

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