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TEA1792TS 데이터시트 PDF




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부품번호 TEA1792TS 기능
기능 GreenChip synchronous rectifier controller
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TEA1792TS 데이터시트, 핀배열, 회로
TEA1792TS
GreenChip synchronous rectifier controller
Rev. 3 — 29 January 2014
Product data sheet
1. General description
The TEA1792TS is a member of the new generation of Synchronous Rectifier (SR)
controller ICs for switched mode power supplies. Its high level of integration allows the
design of a cost-effective power supply with a very low number of external components.
The TEA1792TS is a controller IC dedicated to synchronous rectification on the
secondary side of discontinuous conduction mode and quasi-resonant flyback converters.
The TEA1792TS is fabricated in a Silicon-On-Insulator (SOI) process.
2. Features and benefits
2.1 Distinctive features
Accurate synchronous rectification functionality
Wide supply voltage range (8.5 V to 38 V)
High level of integration, resulting in a very low external component count
High driver output voltage of 10 V to drive all MOSFET brands to the lowest RDSon
Selectable regulation level for driver stage
2.2 Green features
Low current consumption
High system efficiency from no load to full load
2.3 Protection features
UnderVoltage Protection (UVP)
3. Applications
The TEA1792TS is intended for adapters. The device can also be used in all other
discontinuous conduction mode systems and quasi-resonant flyback systems that
demand a highly efficient and cost-effective solution.




TEA1792TS pdf, 반도체, 판매, 대치품
NXP Semiconductors
TEA1792TS
GreenChip synchronous rectifier controller
7. Functional description
7.1 Introduction
The TEA1792TS is the controller for synchronous rectification used in discontinuous
conduction mode and quasi-resonant flyback converters.
7.2 Start-up and UnderVoltage LockOut (UVLO)
The IC leaves the undervoltage lockout state and activates the synchronous rectifier
circuitry when the voltage on the VCC pin is above 8.5 V (typical). When the voltage drops
below 8.0 V (typical), the undervoltage lockout state is entered again and the SR driver
output is actively kept low.
7.3 Synchronous rectification
After a negative voltage lower than Vact(drv) (220 mV typical) is sensed on the SRSENSE
pin, the driver output voltage is driven HIGH. Then the external MOSFET is switched on.
As soon as the SRSENSE voltage rises to Vreg(drv) (42 mV/30 mV) the driver output
voltage is regulated to maintain the Vreg(drv) on the SRSENSE pin. When the SRSENSE
voltage is above the Vdeact(drv) level (12 mV typical), the driver output is pulled to ground.
After switch-on of the SR MOSFET, the input signal on the SRSENSE pin is blanked
during the tact(sr)(min) (1.8 s typical). This action eliminates false switch-off due to high
frequency ringing at the start of the secondary stroke.
When the voltage on the SRSENSE pin is Vreg(drv), the driver output voltage is reduced.
This reduction enables the external power switch to be switched off quickly when the
current through the switch reaches zero. The zero current switch-off removes the need for
a separate Standby mode to maintain high efficiency during the no-load operation. The
zero current is detected by sensing a Vdeact(drv) (12 mV typical) level on the SRSENSE
pin (see Figure 3).
TEA1792TS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 29 January 2014
© NXP B.V. 2014. All rights reserved.
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TEA1792TS 전자부품, 판매, 대치품
NXP Semiconductors
TEA1792TS
GreenChip synchronous rectifier controller
10. Characteristics
Table 5. Characteristics
Tamb = 25 C; VCC = 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into
the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
Supply voltage management (pin VCC)
Vstartup
start-up voltage
Vhys hysteresis voltage
ICC(oper)
operating supply current
VCC = 8 V (VCC < Vstartup)
under normal operation; no load
on pin DRIVER
8.2
[1] 0.35
0.2
0.8
8.5
0.5
0.25
1
8.8 V
0.65 V
0.4 mA
1.2 mA
Synchronous rectification sense input (pin SRSENSE)
Vact(drv)
Vreg(drv)
driver activation voltage
driver regulation voltage
resistance between pins SELREG
and GND < 15 k
260
55
220
42
180 mV
30 mV
resistance between pins SELREG
and GND > 700 k
38 30 22 mV
Vdeact(drv)
td(act)(drv)
tact(sr)(min)
driver deactivation voltage
driver activation delay time
minimum synchronous
rectification active time
short time
long time
-
12 -
mV
50 75 100 ns
1.3 1.8 2.3 s
1.6 2.1 2.6 s
Io(SELREG)
output current on pin
SELREG
VSELREG = 2.5 V
12 10 8 A
Driver (pin DRIVER)
Isource
source current
VCC = 15 V; voltage on pin
DRIVER = 2 V
during minimum synchronous
rectification time
0.45 0.4 0.35 A
minimum synchronous
rectification time has ended
6 5 4 mA
Isink sink current
VCC = 15 V
voltage on pin DRIVER = 2 V
1 1.4 - A
voltage on pin DRIVER = 9.5 V
2.2 2.7 -
A
Vo(max)
maximum output voltage VCC = 15 V
9 10 12 V
[1] The VCC stop voltage is Vstartup Vhys.
TEA1792TS
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 29 January 2014
© NXP B.V. 2014. All rights reserved.
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TEA1792TS

GreenChip synchronous rectifier controller

NXP Semiconductors
NXP Semiconductors

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