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PDF TEA1781T Data sheet ( Hoja de datos )
| Número de pieza | TEA1781T | |
| Descripción | (TEA1781T / TEA1782T) GreenChip PC secondary control ICs | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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TEA1781T; TEA1782T
GreenChip PC secondary control ICs
Rev. 01 — 13 February 2009
Preliminary data sheet
www.datasheet4u.com
1. General description
The TEA1781T and TEA1782T are designed to cooperate with the TEA1771T primary
side controller in a unique converter topology based on the active clamp forward
converter. On the secondary side the output voltages are regulated via bidirectional
switches. A typical application area of this converter is a power supply for a desktop PC.
The TEA1781T and TEA1782T are secondary control ICs and regulate each output
voltage independently of the primary duty cycle and other secondary output voltages.
Because of these separated regulations, the system does not show any cross regulation
and makes the design of the transformer easier.
As each output can also be completely turned off, the system allows for an integrated
standby supply. To maximize the efficiency in Standby mode, the duty cycle and operating
frequency are minimized in Standby mode.
The TEA1781T and TEA1782T have integrated drivers and individual output voltage
regulators. In this way the 3.3 V, 5 V, 12 V and 5 V standby outputs of a typical PC power
supply are regulated separately giving accurate output voltages and fast transient
response.
All requirements according to the Intel ATX specification (V 2.0) are integrated, such as
soft start, a PS_ON# connection, a PwrOK signal and all required protections like
OverCurrent Protection (OCP) and OverVoltage Protection (OVP). These voltage and
current levels are monitored at each output separately. The system also has an
OverTemperature Protection (OTP) function.
The system fulfills the current and proposed efficiency standards such as 80+ gold,
energy star and blue angel.
The TEA1781T and TEA1782T are implemented in a high voltage (ABCD)
Silicon On Insulator (SOI) process.
2. Features
I Designed for ATX PC power supplies
I Integrated standby supply
I Enhanced efficiency in Standby mode
I No cross regulation
I Accurate output voltage regulation
I Fast transient response
I Integrated soft start for all output voltages
I Flexible transformer design without the need of a post regulator
1 page  
NXP Semiconductors
TEA1781T; TEA1782T
GreenChip PC secondary control ICs
6.2 Pin description
www.datasheet4u.com
Table 2. TEA1781T pin description
Symbol
Pin Description
FSB_5V
1
floating supply switch SB_5V
GSB_5V
2
gate driver switch SB_5V
DF_5V
3 drain voltage of switch SF_5V
VSTARTUP
4
start-up voltage connected to rectified secondary winding voltage
OCP
5 overcurrent protection
CS_5V 6 current sense 5 V output
VOUT_5V
7
output voltage 5 V output
VSENSE_5V 8
sense voltage 5 V output
VNTC
9 NTC voltage
ENABLE 10 enabling Normal mode
PGND_5V
11
power ground 5 V output
GSF_5V 12 gate driver switch SF_5V
GND
13 ground
GND
14 ground
VDD
15 supply voltage
GSF_3V3
16
gate driver switch SF_3V3
PGND_3V3
17
power ground 3V3 output
PWROK 18 power OK
VSENSE_3V3 19
sense voltage 3.3 V output
VOUT_3V3
20
output voltage 3.3 V output
CS_3V3 21 current sense 5 V output
PGOOD 22 PowerGood (delay setting for power OK)
DF_3V3
23 drain voltage of switch SF_3V3
GSB_3V3
24
gate driver switch SB_3V3
FSB_3V3
25
gate driver switch SB_3V3
WND_SEC_2 26
secondary transformer 3.3 V / 5 V winding voltage
GSR
27 gate driver switch SR (3.3 V / 5 V)
FSR
28 floating supply switch SR (3.3 V / 5 V)
Table 3. TEA1782T Pin description
Symbol
Pin Description
FSB_12V
1
floating supply switch SB_12V
GSB_12V
2
gate driver switch SB_12V
DF_12V
3
drain voltage of switch SF_12V
OCP_12V
4
overcurrent protection 12 V output
CS_12V
5
current sense 12 V output
VOUT_12V1
6
output voltage 12 V1 output
VOUT_12V2
7
output voltage 12 V2 output
EN_NM
8
enable Normal mode
TEA1781_82_1
Preliminary data sheet
Rev. 01 — 13 February 2009
© NXP B.V. 2009. All rights reserved.
5 of 32
5 Page 
NXP Semiconductors
TEA1781T; TEA1782T
GreenChip PC secondary control ICs
www.datasheet4u.com
3.3 V / 5 V
outputs are
enabled
Vtrip(ENABLE)
TEA1781
ENABLE
Digital control
IENABLE
temp.prot
protection 5 V
VVDD < Vstop(VDD) STARTUP
VENABLE
VENABLE = 4 V
VVDD > Vstartup(VDD)
IENABLE > Iprot(ENABLE)+ EN_NM
+ PS_OFF+ PROT_12V + UVP_STB
protection 3.3 V
NORMAL
VENABLE = 11 V
PS_OFF
PROT/STDB
VENABLE = 4 V
TEA1782
SYSTEM
RESTART
system failure
detection
014aaa189
Fig 9. The ENABLE signal is for communicating between the secondary control ICs
TEA1781_82_1
Preliminary data sheet
Rev. 01 — 13 February 2009
© NXP B.V. 2009. All rights reserved.
11 of 32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TEA1781T.PDF ] | |
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