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TLD5191IVREG-EVAL evaluation board
User Manual
About this document
Adjust I
via RSET (>150 mA suggested for better accuracy and transient response)
4.
OUT
Adjust PWM duty cycle via RPWMI if enabled (see Chapter 3.1.1).
5.
NOTE:
If the output voltage is below 6V (i.e. load of just one LED) it is recommended to close JO2 to bypass the PMOS for
PWM dimming in order to avoid excessive power dissipation on the PMOS.
3.1.1
Embedded PWM engine
The embedded PWM engine provides an internal PWM signal without any external dimming signal required. It is
enabled when jumper J_PWMI is closed. If jumper J_DIMM is open, the PWMI pin is biased at 5 V and then the
duty cycle is 100%. Closing jumper J_DIMM, the duty cycle is adjustable by means of trimmer RPWMI. The PWM
frequency is fixed at nominal value of 270 Hz.
User Manual
2021-04-13
5 of 14
Rev.1.00
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