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PDF AN10861 Data sheet ( Hoja de datos )
| Número de pieza | AN10861 | |
| Descripción | GreenChip III TEA1752 integrated PFC and flyback controller | |
| Fabricantes | NXP Semiconductors | |
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AN10861
GreenChip III TEA1752 integrated PFC and flyback controller
Rev. 01 — 16 July 2010
Application note
Document information
Info Content
Keywords
GreenChip III, TEA1752, PFC, flyback, high efficiency, adaptor, notebook,
PC power
Abstract
The TEA1752 is a member of the new generation of PFC and flyback
combination controller ICs, used for efficient switched mode power
supplies. It has a high level of integration which allows the design of a
cost-effective power supply with a minimum number of external
components. The TEA1752 is fabricated in a Silicon On Insulator (SOI)
process, enabling it to operate a wide voltage range.
http://www.Datasheet4U.com
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+
BD1
−
LF2
CX1
R1 R2
LF1
L1
C1
L2
97
C2
12
1
D1 BC1
C3 R5
C5
D2
Q1
R9 R8
R12 R11
C6
R10
R5A
R6
R6A
R14
R16 R16A
C10
C8 R18
D3
D4
Q2
R13 C9
R15
R17 D5
2
T1
11
D30
4
1
U3
VCC
8
3
C30 TEA1791
GND 2 41
5
6
7
n.c.
n.c.
n.c.
n.c.
7, 8
9, 10
R30 R32
Q4
R33 C31
L3
C27 C28 C29
F1
Θ
mains
inlet
RT1
NTC
CY1 BC2
R28
C25
R29
Q3
R27
R3
C24
R7 C4
U1
PFCTIMER 14 15 9
PFCSENSE
11
PFCDRIVER
12
PFCAUX
8
7
C23
13 10
16
TEA1752
25
5
C14 C13 R23A D23A R20
C12 6
R23
1
FBAUX
4
R34
FBCTRL
3
6 PFCCOMP
4
U2
R24 C15
1
R35
RT2
NTC
R25
C17
32
U4
C34
C35 R36
C22 R4
C21 C20
Θ
C19
R26 C18
C16
R37
R38
OPTIONAL
see section 5.2, 5.2.1
019aaa027
Vout +
Vout −
Fig 1. Application schematic
5 Page 
NXP Semiconductors
AN10861
GreenChip III TEA1752 integrated PFC and flyback controller
3.4 Mains voltage sensing and brownout
The mains input voltage is measured through the VINSENSE pin. When the VINSENSE
pin has reached Vstart(VINSENSE) (1.15 V) the PFC can start switching, but only if the other
start conditions are met as well, see Section 3.1. As soon as the voltage on pin
VINSENSE drops below Vstop(VINSENSE) (0.89 V), the PFC stops switching. The flyback
however, continues switching until its maximum on-time protection, ton(fb)max (40 μs) is
triggered. When this protection is triggered, the IC stops switching and enters Safe restart
mode.
The voltage on pin VINSENSE must be an average DC value, representing the mains
input voltage. The system works optimally with a time constant of approximately 150 ms at
the VINSENSE pin. The high time constant on pin VINSENSE prevents a fast restart of
the PFC after a mains dropout, therefore the voltage at the VINSENSE pin is clamped to
100 mV below the Vstart(VINSENSE) level. This guarantees a fast PFC restart after recovery
of the mains input voltage.
mains
inlet
CX1
R1
R2
BD1
−+
C1
R3
VINSENSE
7
TEA1752
R4 C20
Fig 5. VINSENSE circuitry
2
GND
019aaa031
3.4.1 Discharge of mains input capacitor
The X-capacitors in the ElectroMagnetic Compatibility (EMC) input filtering must be
discharged with a time constant of τ < 1 second for safety reasons (see Ref. 1).
In a typical 90 W adapter application with CX1 = 220 nF, the replacement value resistor
value RV is determined by:
RV
=
R + R----×--(-)R---3---+--R--4---
RR++ 3 R4
(1)
Where:
• R = R1 = R2
AN10861
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 01 — 16 July 2010
© NXP B.V. 2010. All rights reserved.
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| PDF Descargar | [ Datasheet AN10861.PDF ] | |
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