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AN11013 데이터시트 PDF




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부품번호 AN11013 기능
기능 GreenChip III TEA1753 integrated PFC and flyback controller
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AN11013 데이터시트, 핀배열, 회로
AN11013
GreenChip III TEA1753 integrated PFC and flyback controller
Rev. 1 — 21 March 2011
Application note
Document information
Info Content
Keywords
GreenChip III, TEA1753, PFC, flyback, high efficiency, adaptor, notebook,
PC power
Abstract
The TEA1753 is a member of the new generation of PFC and flyback
combination controller ICs, used for efficient switched mode power
supplies. Using the TEA1753 and TEA1703 provides a solution for
applications needing an extremely low Standby power mode. It has a high
level of integration which allows the design of a cost-effective power
supply using the minimum number of external components. The TEA1753
is fabricated in a Silicon On Insulator (SOI) process, enabling it to operate
at a wide voltage range.




AN11013 pdf, 반도체, 판매, 대치품
NXP Semiconductors
AN11013
GreenChip III TEA1753 integrated PFC and flyback controller
General purpose input for latched protection
Internal IC overtemperature protection
One high-voltage spacer between the HV pin and the next active pin
Open pin protection on the VINSENSE, VOSENSE, PFCAUX, FBCTRL and FBAUX
pins
1.2.3 PFC features
Dual output voltage boost converter
QR/DCM operation with valley switching
Frequency limitation (250 kHz) to reduce switching losses and ElectroMagnetic
Interference (EMI)
ton controlled
Mains input voltage compensation for control loop for good transient response
OverCurrent Protection (OCP)
Soft-start and soft-stop
Open/short detection for PFC feedback loop: no external Overvoltage Protection
(OVP) circuit necessary
Adjustable delay for turning off the PFC
1.2.4 Flyback features
QR/DCM operation with valley switching
Frequency Reduction (FR) with fixed minimum peak current and valley switching to
maintain high efficiency at low output power levels without audible noise
Frequency limitation (125 kHz) to reduce switching losses and EMI
Current mode controlled
Overcurrent protection
Soft-start
Accurate OVP through auxiliary winding
Time-out protection for output overloads and open flyback feedback loop, available as
safe restart (TEA1753T) or latched (TEA1753LT) protection
1.3 Application schematic
Refer to Figure 1 for an overview of a typical application.
AN11013
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 21 March 2011
© NXP B.V. 2011. All rights reserved.
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AN11013 전자부품, 판매, 대치품
NXP Semiconductors
AN11013
GreenChip III TEA1753 integrated PFC and flyback controller
2. Pin description
Table 1. Pin description
Pin Name
Functional description
1 VCC
Supply voltage: Vstartup = 22 V, Vth(UVLO) = 15 V.
At mains switch-on, the capacitor connected to this pin is charged to Vstartup
by the internal HV current source. When the pin voltage is lower than 0.65 V,
the charge current is limited to 1 mA to prevent overheating of the IC if the
VCC pin is short-circuited. When the pin voltage is between 0.65 V and
Vth(UVLO), the charge current is 5.4 mA to enable a fast start-up. When it is
between Vth(UVLO) and Vstartup, the charge current is limited to 1 mA again to
reduce the safe restart duty cycle. This results in a reduction of the input
power during fault conditions. When Vstartup is reached, the HV current
source is pinched off and VCC is regulated to Vstartup until the flyback starts.
See Section 3.2 for a complete description of the start-up sequence.
2 GND
Ground connection.
3 FBCTRL
Control input for flyback for direct connection of the optocoupler.
At a control voltage of 2 V the flyback delivers maximum power. At a control
voltage of 1.5 V the flyback enters the Frequency reduction mode. At 1.3 V
the flyback stops switching. There is an internal 30 A current source
connected to the pin, which is controlled by the internal logic. This current
source can be used to implement a time-out function to detect an open
control loop or a short circuit of the output voltage. The time-out function is
disabled by connecting a resistor of 100 kbetween this pin and ground.
4 FBAUX
Input from auxiliary winding for transformer demagnetization detection,
mains dependent OverPower Protection (OPP) and OverVoltage Protection
(OVP) of the flyback.
The combination of the demagnetization detection and the valley detection
at pin HV determines the switch-on moment of the flyback in the valley. A
flyback OVP is detected at a current higher than 300 A to the FBAUX pin.
Internal filtering prevents false detection of an OVP. The flyback OPP starts
at a current lower than 100 A from the FBAUX pin.
5 LATCH
General purpose latched protection input.
When Vstartup (on pin 1) is reached, this pin is charged to 1.35 V before the
PFC and the flyback can be enabled. The latched protection is triggered
when the pin is pulled below 1.25 V and the PFC and the flyback are
disabled.
An internal 80 A current source is connected to the pin, which is controlled
by the internal logic. Using this current source, an optional Negative
Temperature Coefficient (NTC) resistor can be directly connected to this pin
for temperature protection.
6 PFCCOMP Frequency compensation pin for the PFC control loop.
AN11013
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 21 March 2011
© NXP B.V. 2011. All rights reserved.
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AN11013

GreenChip III TEA1753 integrated PFC and flyback controller

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