ZHCSMU8C March 2020 – July 2021 TPS54JA20
PRODUCTION DATA
The TPS54JA20 provides forced CCM operation for tight output ripple application and auto-skip Eco-mode for high light-load efficiency. The TPS54JA20 allows users to select the switching frequency and operation mode by connecting a resistor from the MODE pin to AGND pin. Table 7-1 lists the resistor values for the switching frequency and operation mode selection. TI recommends ±1% tolerance resistors with a typical temperature coefficient of ±100 ppm/°C.
The MODE state will be set and latched during the internal power-on delay period. Changing the MODE pin resistance after the power-on delay will not change the status of the device. The internal circuit will set the MODE pin status to 600 kHz / skip mode if the MODE pin is left open during the power-on delay period.
To make sure the internal circuit detects the desired option correctly, do not place any capacitor on the MODE pin.
| MODE PIN CONNECTIONS | OPERATION MODE UNDER LIGHT LOAD | SWITCHING FREQUENCY (fSW) (kHz) | |
|---|---|---|---|
| Short to VCC | Skip-mode | 600 | |
| 243-kΩ ± 10% to AGND | Skip-mode | 800 | |
| 121-kΩ ± 10% to AGND | Skip-mode | 1000 | |
| 60.4-kΩ ±10% to AGND | Forced CCM | 1000 | |
| 30.1-kΩ ±10% to AGND | Forced CCM | 800 | |
| Short to AGND | Forced CCM | 600 | |