TEA1755LT Datasheet PDF - NXP

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TEA1755LT
NXP

Part Number TEA1755LT
Description HV start-up DCM/QR flyback controller
Page 30 Pages


TEA1755LT datasheet pdf
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TEA1755LT
HV start-up DCM/QR flyback controller with integrated
DCM/QR PFC controller
Rev. 1.1 — 13 March 2015
Product data sheet
1. General description
The GreenChip is the latest generation of green Switched Mode Power Supply (SMPS)
controller ICs. The TEA1755LT combines a controller for Power Factor Correction (PFC)
and a flyback controller. Its high level of integration enables cost-effective power supply
design using a very low number of external components.
The PFC operates in Quasi-Resonant (QR) or Discontinuous Conduction Mode (DCM),
with valley switching.
The specially built-in green functions provide high efficiency at all power levels. At high
power levels the flyback operates in QR mode or DCM with valley detection. At medium
power levels, the flyback controller switches to Frequency Reduction (FR) mode and limits
the peak current to an adjustable minimum value. In low power mode, the PFC switches
off to maintain high efficiency. At very low power levels, when the flyback switching
frequency drops below 25 kHz, the flyback converter switches to burst mode. During the
non-switching phase of burst mode, the internal IC supply current is minimized to further
optimize efficiency. Valley switching is used in all operating modes.
The advanced burst mode ensures high efficiency at low power and good standby power
performance while minimizing audible transformer noise.
The TEA1755LT is a Multi-Chip Module, (MCM), containing two chips. The proprietary
high-voltage BCD800 process makes direct start-up possible from the rectified universal
mains voltage in an effective and green way. The second low voltage Silicon-On-Insulator
(SOI) is used for accurate, high-speed protection functions and control.
The TEA1755LT enables easy design of highly efficient and reliable supplies up to 250 W.
These power supply designs are cost-effective, requiring the minimum number of external
components.
Remark: All values in this document are typical values unless otherwise stated.



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NXP Semiconductors
TEA1755LT
HV start-up DCM/QR flyback controller with integrated DCM/QR PFC
controller
2. Features and benefits
2.1 Distinctive features
Integrated PFC and flyback controller
Universal mains supply operation between 70 V (AC) to 276 V (AC)
Dual-boost PFC with accurate maximum output voltage (NXP Semiconductors
patented)
High level of integration, results in cost-effective designs with very low external
component counts
Adjustable PFC switch off delay
External PFC switch on and switch off override
Accurate PFC switch on and switch off control (NXP Semiconductors patent pending)
2.2 Green features
On-chip start-up current source
Reduced IC supply current during burst mode enabling ErP lot 6
Power-down functionality for very low standby power
2.3 PFC green features
Valley/Zero-Voltage Switching (ZVS) for minimum switching losses
(NXP Semiconductors patented)
Frequency limitation reduces switching losses
PFC switched off when a low-load is detected at the flyback output
2.4 Flyback green features
Valley switching for minimum switching losses (NXP Semiconductors patented)
Frequency reduction with adjustable minimum peak current at low-power operation
maintains high-efficiency at low output power levels
Burst mode operation at very low-power levels for high-efficiency operation
2.5 Protection features
Safe restart mode for system fault conditions
Continuous mode protection using demagnetization detection for both converters
(NXP Semiconductors patented)
UnderVoltage Protection (UVP) (foldback during overload)
Accurate OverVoltage Protection (OVP) for both converters (adjustable for flyback
converter)
Mains voltage independent OverPower Protection (OPP)
Open control loop protection for both converters. The open-loop protection on the
flyback converter is latched
OverTemperature Protection (OTP)
Low and adjustable OverCurrent Protection (OCP) trip level for both converters
General-purpose input for latched protection, for use with system OverTemperature
Protection (OTP)
TEA1755LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 13 March 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
2 of 35



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NXP Semiconductors
TEA1755LT
HV start-up DCM/QR flyback controller with integrated DCM/QR PFC
controller
3. Applications
The device can be used in all applications requiring an efficient and cost-effective
power supply solution for up to 250 W. Notebook adapters in particular benefit from the
high level of integration
4. Ordering information
Table 1. Ordering information
Type number
Package
Name
Description
TEA1755LT/1
SO16
plastic small outline package; 16 leads; body width 3.9 mm
5. Block diagram
Version
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Fig 1. TEA1755LT block diagram
TEA1755LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 13 March 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
3 of 35



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NXP Semiconductors
TEA1755LT
HV start-up DCM/QR flyback controller with integrated DCM/QR PFC
controller
6. Pinning information
6.1 Pinning
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Fig 2. TEA1755LT pin configuration (SOT109-1)
6.2 Pin description
Table 2. Pin description
Symbol
Pin Description
VCC
GND
1 supply voltage
2 ground
FBCTRL
3 flyback control input
FBAUX
4 auxiliary winding input for demagnetization timing and flyback OVP
LATCH
5 general-purpose protection input
PFCCOMP 6 PFC frequency compensation
VINSENSE 7 mains voltage sense input
PFCAUX
8 auxiliary winding input for demagnetization timing of the PFC
VOSENSE 9 sense input for PFC output voltage
FBSENSE 10 flyback current sense input
PFCSENSE 11 PFC current sense input
PFCDRIVER 12 PFC gate-driver output
FBDRIVER 13 flyback gate-driver output
PFCTIMER 14 PFC override and switch off delay timer
HVS
15 high-voltage safety spacer; not connected
HV 16 high-voltage start-up and flyback valley sensing
TEA1755LT
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 13 March 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
4 of 35



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