Soleniod driver DRV102 input signal Spec

Hello user1241843,

Sorry for the delay in response. It sometimes takes some time for an E2E to make its way to the correct support group. The DRV102 ia actually supported by the Precision Op amps group.

I don't fully understand your some of your questions and comments so some clarifications are needed. The waveform images didn't come through with your inquiry so those are needed too. Let me make sure I understand what your comments and questions:

• Now we use the DRV102 to driving a soleniod valve so as to down the voltage during hold phase - The DRV102 should manitain the peak output voltage when it changes from continuous mode, to PWM mode. Going to PWM mode shouldn't result in much change in the peak voltage, but rather reduces the power dissipation by reducing the time current flows through the solenoid coil.
• we have a question is that there is a undesired 1kHz PWM signal but not a On/Off signal need to connected to the DRV102 input Pin(Pin1) to control the output of DRV102, we captured the input and output waveform as belwo figure: - Please clarify what this statement means. Pin 1 is the enable input. When the correct voltage level is applied the device starts the initial dc and PWM cycle.When the pin goes low the PWM output ceases.
• The waveform shows that the frequency of DRV102 output is according to the input signal also is 1kHz, meanwhile, adjusting for Rpwm is no use for output waveform, obviously, the internal PWM generater not working in this scenario. However, the 1kHz output signal still working for valve driving and voltage discreasing feature. - Please provide a schematic of your circuit and show what the voltage applied to pin 1 looks like, and the output waveform at the solenoid looks like.
• So, could we use the DRV102 in this scenario? is there any uncertain risk for the input signal out of Spec? as we can not find any information in the datasheet that input signal of DRV102 is compatible with 1kHz PWM. - Once I have the circuit and waveform information I should be able to address this question.

Regards, Thomas

PA - Linear Applications Engineering

Now we use the DRV102 to driving a soleniod valve so as to down the voltage during hold phase - The DRV102 should manitain the peak output voltage when it changes from continuous mode, to PWM mode. Going to PWM mode shouldn't result in much change in the peak voltage, but rather reduces the power dissipation by reducing the time current flows through the solenoid coil.

-thanks for this information

•we have a question is that there is a undesired 1kHz PWM signal but not a On/Off signal need to connected to the DRV102 input Pin(Pin1) to control the output of DRV102, we captured the input and output waveform as belwo figure: - Please clarify what this statement means. Pin 1 is the enable input. When the correct voltage level is applied the device starts the initial dc and PWM cycle.When the pin goes low the PWM output ceases.

-yes, Pin1 is the enable input exactly, but what will happen when a 1kHz PWM signal on Pin1?

•The waveform shows that the frequency of DRV102 output is according to the input signal also is 1kHz, meanwhile, adjusting for Rpwm is no use for output waveform, obviously, the internal PWM generater not working in this scenario. However, the 1kHz output signal still working for valve driving and voltage discreasing feature. - Please provide a schematic of your circuit and show what the voltage applied to pin 1 looks like, and the output waveform at the solenoid looks like.

Input signal, hit duration:

Input signal, hold duration:

Output on valve, hold duration:

•So, could we use the DRV102 in this scenario? is there any uncertain risk for the input signal out of Spec? as we can not find any information in the datasheet that input signal of DRV102 is compatible with 1kHz PWM. - Once I have the circuit and waveform information I should be able to address this question.

-please see the detailed information as up

Hello user1241843,

•we have a question is that there is a undesired 1kHz PWM signal but not a On/Off signal need to connected to the DRV102 input Pin(Pin1) to control the output of DRV102, we captured the input and output waveform as belwo figure: - Please clarify what this statement means. Pin 1 is the enable input. When the correct voltage level is applied the device starts the initial dc and PWM cycle.When the pin goes low the PWM output ceases.

-yes, Pin1 is the enable input exactly, but what will happen when a 1kHz PWM signal on Pin1?

The DRV102 will respond to the high (VCTR High) and low (VCTR Low) levels of a 1 kHz PWM signal applied to pin 1, just as it would to other types of input waveforms that cross those voltage threshold levels. When the PWM signal crosses the VCTR High threhold, regardless of the PWM pulse width at that instant, the initial constant DC level will begin its period at the output. How long that lasts is determined by the delay adjust capacitor CD connected to pin 2. That would be followed directly by the PWM period which lasts as long as the input pulse stays high. If the PWM pulse on its falling edge drops below the VCTR Low threshold, the output is disabled and the DC level, or the PWM period, that is in progress ends and goes low.

•The waveform shows that the frequency of DRV102 output is according to the input signal also is 1kHz, meanwhile, adjusting for Rpwm is no use for output waveform, obviously, the internal PWM generater not working in this scenario. However, the 1kHz output signal still working for valve driving and voltage discreasing feature. - Please provide a schematic of your circuit and show what the voltage applied to pin 1 looks like, and the output waveform at the solenoid looks like.

The sum of the Delay Adjust and Duty Cycle Adjust times must be shorter than the exertnal PWM pulse time applied to the enable pin (pin 1). If the DC output period is set longer than the input PWM individual pulse duration, the DRV102 output will simply follow the input PWM signal.

If you wish to include images or diagrams in your E2E communications use the 10th icon on the above bar (in-between the indent and paperclip icons). It will accept a limited number of formats. Graphics formats such as JPEG, PNG, etc, will work.

Please note that this coming week is Thanksgiving week, in the US. Reponses will be delayed because many people will be on holiday.

Regards, Thomas

PA - Linear Applications Engineering

Thanks a lot for your answer, it make good sense for me now, so coudl you please help answer a question for us:

if we apply a 1kHz PWM signal to Pin1 for our application, is it any uncertain risk for the DRV102? any degradation for it such as lifecycle? or other risk? many thanks.

Dear

Could you please answer our qustions for the reliability of DRV102 for our special usage?

"

Thanks a lot for your answer, it make good sense for me now, so coudl you please help answer a question for us:

if we apply a 1kHz PWM signal to Pin1 for our application, is it any uncertain risk for the DRV102? any degradation for it such as lifecycle? or other risk? many thanks.

"