NXP Semiconductors

TEA2095T

GreenChip dual synchronous rectifier controller

TEA2095T

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Product data sheet

Rev. 1.1 — 10 April 2020

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8.6 Source sense connection (SSA and SSB pins)

The IC is equipped with additional source sense pins (SSA and SSB). These pins are

used for the measurement of the SR MOSFET drain-to-source voltage. The source

sense input must be connected as close as possible to the source pin of the external SR

MOSFET. It minimizes errors caused by voltage difference on PCB tracks because of

parasitic inductance in combination with large dI/dt values.

8.7 Interlock function

The TEA2095T incorporates an interlock function. The interlock function avoids the turn-

on of both gate driver outputs at the same time.

turning on the other gate driver output.

8.8 Discharge function

Disconnecting a power supply from the mains voltage should lead to zero output voltage

and the power indicator turn-off. The TEA2095T contains a discharge function that

automatically discharges the output capacitor after a mains disconnect.

The detection of the mains disconnect happens by monitoring the activity of the

synchronous rectification and applying a 1.4 s threshold for discriminating between no-

load operation and power disconnect.

The discharge function creates a rapid discharging with a constant power dissipation of

0.4 W. Figure 5 shows the secondary current, the drain sense voltage, the gate driver

voltage, and the supply current.

The TEA2095T enters the energy save mode 110 μs after the last SR cycle. The supply

current changes to a very low level of 90 μA for low no-load power. After 1.4 seconds

without SR activity, the TEA2095T makes a transition to the discharge mode and draws a

voltage exceeds the start level, the discharge current switches off.