Hi
Thanks for your reply, The board is designed refer to TI CDK,but power supply is changed(Use severalpower IC),
TPS62085RLTR for 1V5(50ma at 48MHZ, 500ma at 300KHZ)
TPS62085RLTR for 1V2(about 120ma)
TPS62060 for DC 3V3 (about 130ma)
TPS7A8101…
You will need to make sure your board was assembled correctly and with no solder shorts. These are the most common reasons for seeing 0V at the output.
Your board layout does not follow any of the recommendations for a good power supply layout, so I…
Per the D/S, the device is disabled when the EN pin is low. So, it is off. Both switching FETs are open.
You might also look at the newer TPS62080, TPS62060, or TPS62090.
Switcher Pro is programmed to set the lower resistor per the datasheet recommendation of between 180 and 360k. At higher output voltages, this leads to total feedback divider resistances that exceed 1 Meg. This post explains the tradeoffs between higher…
Hello Sway,
The feedback resistors and CFF defines the output voltage setting and the transient response of the system. The choice depends upon the user and the application.
However, datasheet recommends use a feedback resistor (bottom), R2 lower…
Hi Stanley,
The reason why we recommend resistor divider values below 100kohm has to with the leakage current that flows into the feedback pin. If the feedback resistors are too large, the current that can flow through the feedback resistor network…
Hello Yamada,
Thanks for reaching out. The turn on and turn off voltages are set with a resistor divider from VIN to GND. The feedback divider (RFBT, RFBB) is the divider that sets the Vout in your converter. You can have the top resistor equal to 470kOhm…
Hi MJ,
1. You can refer to the following document.
Design considerations for a resistive feedback divider in a DCDC converter.pdf
2. Try to increase the ratio R3023/R3026(to about 10:1) by changing the value of R3023 and R3026 according to your…
Hi Nini,
1. The error source/sink current shown under EC is the current expected to go through the error amplifier. The source current is the supplied current while the sink current is the received current, which I believe is out-phase meaning that…
