TEA1795T datasheet(4/14 Pages) PHILIPS

部品番号	TEA1795T

部品情報	GreenChip synchronous rectifier controller

Download	14 Pages

Scroll/Zoom	100%

メーカー	PHILIPS [NXP Semiconductors]

ホームページ	http://www.nxp.com

Logo

4 / 14 page

TEA1795T

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1 — 4 November 2010

4 of 14

NXP Semiconductors

TEA1795T

GreenChip synchronous rectifier controller

7.2 Start-up and UnderVoltage LockOut (UVLO)

The IC leaves the UVLO state and activates the synchronous rectifier circuitry when the

voltage on the VCC pin is above Vstartup (8.5 V typical). When the voltage drops below

8.0 V (typical), the UVLO state is reentered and the SR MOSFET gate driver outputs are

actively kept low.

7.3 Supply management

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

band gap circuit.

7.4 Synchronous rectification (DSA, SSA, DSB and SSB pins)

The voltages present between the drain and source terminals of the SR MOSFETs are

used to derive the timing for the gate drive signal. The IC senses the voltage difference

between the drain sense (pins DSA and DSB) and the source sense (pins SSA and SSB)

connections. When this voltage difference is lower than Vact(drv) (−220 mV typical), the

corresponding gate driver output voltage is driven high and the external SR MOSFET is

switched on.

When the external SR MOSFET is switched on, the input signals on the drain sense pins

and source sense pins are ignored during the minimum synchronous rectification active

time (tact(sr)(min), 520 ns typical). This minimizes false switch-off due to the sensing of high

frequency ringing signals at the start of the conduction phase.

Once this minimum synchronous rectification active time has ended, the IC monitors the

difference between the drain sense inputs and the source sense inputs. When the

difference is higher than Vreg(drv) (−25 mV typical), the gate driver output voltage is

regulated to maintain this

−25 mV difference between the drain sense pins and the source

sense pins. As a result, the SR MOSFET can be switched off quickly when the current

through the external SR MOSFET reaches zero.

Fig 3.

TEA1795T: typical configuration

001aal797

DSA

GDA

SSA

DSB

VCC

GDB

SSB

GND

Qprim1

CHB

RDRNSENSE1

Qprim2

Qsec1

PRIMARY

SIDE

CONTROLLER

TEA1795T

Vin

Vout

TR

IC1

RDRNSENSE2

Qsec2

Cout

同様の部品番号 - TEA1795T

メーカー	部品番号	データシート	部品情報
NXP Semiconductors	TEA1791AT	262Kb / 13P	GreenChip synchronous rectifier controller Rev. 01-7 June 2010
	TEA1791T	71Kb / 11P	GreenChip synchronous rectifier controller Rev. 01-3 February 2009
	TEA1791T	257Kb / 12P	GreenChip synchronous rectifier controller Rev. 02-7 June 2010
	TEA1791T/N1	71Kb / 11P	GreenChip synchronous rectifier controller Rev. 01-3 February 2009
	TEA1791T/N1	257Kb / 12P	GreenChip synchronous rectifier controller Rev. 02-7 June 2010

More results

同様の説明 - TEA1795T

メーカー	部品番号	データシート	部品情報
NXP Semiconductors	TEA1792ATS	324Kb / 13P	GreenChip synchronous rectifier controller Rev. 1-10 August 2012
	TEA1761T	83Kb / 13P	GreenChip synchronous rectifier controller Rev. 02-25 April 2007
	TEA1998TS	230Kb / 18P	GreenChip synchronous rectifier controller Rev. 1-16 February 2017
	TEA2093TS	273Kb / 19P	GreenChip synchronous rectifier controller Rev. 1 ??7 June 2022
	TEA1892ATS	138Kb / 13P	GreenChip synchronous rectifier controller Rev. 1-10 April 2014
	TEA1762T	81Kb / 15P	GreenChip synchronous rectifier controller Rev. 02-25 April 2007
	TEA1792AT	330Kb / 13P	GreenChip synchronous rectifier controller Rev. 1-10 August 2012
	TEA1999TK	255Kb / 21P	GreenChip synchronous rectifier controller Rev. 2-3 November 2017
	TEA1993TS	207Kb / 20P	GreenChip synchronous rectifier controller Rev.1.1-14 September 2016
	TEA1791T	257Kb / 12P	GreenChip synchronous rectifier controller Rev. 02-7 June 2010