SLVSDW2B December 2018 – November 2020 TPS23755
PRODUCTION DATA
Selecting a converter topology along with a design procedure is beyond the scope of this applications section. The TPS23755 is optimized for primary-side-regulated diode rectified flyback topologies for 12 V outputs or higher due to its good balance of high efficiency and output regulation. Typical applications use post regulation to power the system load's lower voltage rails . The TPS23755 can also be used in non-isolated buck topology application like shown in Figure 8-1.
Examples to help in programming the TPS23755 in a primary-side regulated flyback are shown below. For more specific converter design examples refer to the TPS23755EVM-894 EVM: Evaluation Module for TPS23755.
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
---|---|---|---|---|---|
POWER INTERFACE | |||||
Input voltage | Applied to the PoE Input | 37 | 57 | V | |
Applied to the Secondary Input | 12 | V | |||
Detection voltage | At device terminals | 2.7 | 10.1 | V | |
Classification voltage | At device terminals | 14.5 | 20.5 | V | |
Classification current | RCLASS = 45.3 Ω | 26.5 | 29.3 | mA | |
Inrush current-limit | 140 | mA | |||
Operating current-limit | 550 | mA | |||
DC-TO-DC CONVERTER | |||||
Output voltage | VIN = 48 V, ILOAD ≤ ILOAD (max) | 12 | V | ||
Output current | 37 V ≤ VIN ≤ 57 V | 1 | A | ||
Output ripple voltage peak-to-peak | VIN = 48 V, ILOAD = 1 A | 50 | mV | ||
Efficiency, end-to-end | VIN = 48 V, ILOAD= 100 mA | 78 | % | ||
VIN = 48 V, ILOAD = 500 mA | 86 | ||||
VIN = 48 V, ILOAD = 1 A | 87 | ||||
Switching frequency | 250 | kHz |