TEA1761T データシートの表示（PDF） - NXP Semiconductors.

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TEA1761T

GreenChip synchronous rectifier controller

NXP Semiconductors. 

NXP Semiconductors

TEA1761T

GreenChip synchronous rectifier controller

7.4 Opto output

The opto output is intended to drive an opto coupler (see Figure 5). The opto output has

an open-drain output configuration. The maximum sink current is internally limited to 5 mA

(typical). The output is linearly controlled via the VSENSE and ISENSE input pins. An

over-temperature situation will switch the opto output to its maximum sink current.

During start-up (VCC < Vstartup) and undervoltage lock-out the output is disabled.

7.5 Supply management

All (internal) reference voltages are derived from a temperature compensated, on-chip

band gap circuit. The reference voltage is trimmed to an accuracy within 1 %.

7.6 OverTemperature Protection (OTP)

The IC provides an accurate internal overtemperature protection of 150 °C (typical). The

IC will maximize the current of pin OPTO as soon as the internal temperature limit is

reached. The opto signal can be used on the primary side of the flyback controller to

activate the SMPS protection or limit the output power. As soon as the overtemperature

condition is solved, normal operation will resume.

7.7 Driver

The driver circuit to the gate of the external power MOSFET has a source capability of

typically 250 mA and a sink capability of typically 2.7 A. This permits fast turn-on and

turn-off of the power MOSFET for efficient operation. The output voltage of the driver is

limited to 10 V (typical). This high output voltage will drive all MOSFET brands to the

minimum on-state resistance.

During start-up conditions (VCC < Vstartup) and undervoltage lock-out the driver output

voltage is actively pulled low.

TEA1761T_2

Product data sheet

Rev. 02 — 25 April 2007

© NXP B.V. 2007. All rights reserved.

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