SLVAFD6 July 2022 TPS564247 , TPS565242
3.1.1 Bias Voltage > Target
In the experiment, the target output voltage is 5 V, bias output is 5.05 V. From the test result in Table 3-1, the calculated input voltage based in Equation 5 is 20 V. The measured value is 18.4 V, it has exceeded the absolute max value in data sheet, it may cause permanent device damage.
Table 3-1 Test Result of Vbias>Vtarget in
FCCM Device
| Test device | Vbias | Fsw | L | INOC(measured) | Vin from Eq(5) | Vin measured |
|---|---|---|---|---|---|---|
| TPS565247 | 5.05 V | 574KHz | 1.1uH | 3.08 A | 20V | 18.4 V |
Figure 3-2 Test Waveform of
Vbias>Vtarget in FCCM Device