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TEA1892TS Datasheet(PDF) 5 Page - NXP Semiconductors

Part # TEA1892TS
Description  GreenChip synchronous rectifier controller
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1892TS Datasheet(HTML) 5 Page - NXP Semiconductors

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TEA1892TS
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 1 — 9 April 2014
5 of 13
NXP Semiconductors
TEA1892TS
GreenChip synchronous rectifier controller
The level of the driver regulation voltage Vreg(drv) can be selected using the SELREG pin.
When this SELREG pin is grounded, the typical Vreg(drv) equals 42 mV. When the
SELREG pin is left open, the Vreg(drv) level equals 30 mV.
Internally, the SELREG pin has a pull-up current source of 10
A. When this pin is short
circuited to ground, the pin selects the lowest Vreg(drv). If the pin is left open, the highest
Vreg(drv) value is selected.
7.4 Supply management
All internal reference voltages are derived from a temperature compensated, on-chip
band gap circuit.
7.5 Driver
The driver circuit to the external power MOSFET gate has a typical source capability of
400 mA and a typical sink capability of 2.7 A. These capabilities permit fast switch-on and
switch-off of the power MOSFET for efficient operation. The source stage is coupled to the
timer (see Figure 1). When the timer has finished, the source capability is reduced to a
small current (5 mA typical) capable of keeping the driver output voltage at its level.
The output voltage of the driver is limited to 10 V (typical). This high output voltage drives
all MOSFET brands to the minimum on-state resistance.
During start-up conditions (VCC <Vstartup) and undervoltage lockout the driver output
voltage is actively pulled low.
Fig 3.
Synchronous rectification signals


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