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TEA1750T/N1/DG,518

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
TEA1750_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 15 December 2008 22 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
Demagnetization management PFC (pin PFCAUX)
V
th(comp)PFCAUX
comparator threshold voltage
on pin PFCAUX
−150 −100 −50 mV
t
to(demag)PFC
PFC demagnetization time-out
time
40 50 60 µs
I
prot(PFCAUX)
protection current on pin
PFCAUX
V
PFCAUX
=50mV −75 - −5nA
Driver (pin PFCDRIVER)
I
src(PFCDRIVER)
source current on pin
PFCDRIVER
V
PFCDRIVER
=2V - −0.5 - A
I
sink(PFCDRIVER)
sink current on pin
PFCDRIVER
V
PFCDRIVER
= 2 V - 0.7 - A
V
PFCDRIVER
=10V - 1.2 - A
V
O(PFCDRIVER)max
maximum output voltage on
pin PFCDRIVER
- 1112V
Overvoltage protection flyback (pin FBAUX)
I
ovp(FBAUX)
overvoltage protection current
on pin FBAUX
279 300 321 µA
N
cy(ovp)
number of overvoltage
protection cycles
6812
Demagnetization management flyback (pin FBAUX)
V
th(comp)FBAUX
comparator threshold voltage
on pin FBAUX
60 80 110 mV
I
prot(FBAUX)
protection current on pin
FBAUX
V
FBAUX
=50mV −50 - −5nA
V
clamp(FBAUX)
clamp voltage on pin FBAUX I
FBAUX
= −500 µA −1.0 −0.8 −0.6 V
I
FBAUX
= 500 µA 0.5 0.7 0.9 V
t
sup(xfmr_ring)
transformer ringing
suppression time
1.5 2 2.5 µs
Pulse width modulator flyback
t
on(fb)min
minimum flyback on-time - t
leb(fb)
-ns
t
on(fb)max
maximum flyback on-time 20 25 30 µs
Oscillator flyback
f
sw(fb)max
maximum flyback switching
frequency
100 125 150 kHz
V
start(VCO)FBCTRL
VCO start voltage on pin
FBCTRL
1.3 1.5 1.7 V
V
hys(FBCTRL)
hysteresis voltage on pin
FBCTRL
-60-mV
∆V
VCO(FBCTRL)
VCO voltage difference on pin
FBCTRL
- −0.1 - V
Table 5. Characteristics
…continued
T
amb
=25
°
C; V
CC
= 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
TEA1750_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 15 December 2008 23 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
Peak current control flyback (pin FBCTRL)
V
FBCTRL
voltage on pin FBCTRL for maximum flyback peak
current
1.85 2.0 2.15 V
V
to(FBCTRL)
time-out voltage on pin
FBCTRL
enable voltage - 2.5 - V
trip voltage 4.2 4.5 4.8 V
R
int(FBCTRL)
internal resistance on pin
FBCTRL
-3-kΩ
I
O(FBCTRL)
output current on pin FBCTRL V
FBCTRL
=0V −1.4 −1.17 −0.93 mA
V
FBCTRL
=2V −0.6 −0.5 −0.4 mA
I
to(FBCTRL)
time-out current on pin
FBCTRL
V
FBCTRL
= 2.6 V −36 −30 −24 µA
V
FBCTRL
= 4.1 V −34.5 −28.5 −22.5 µA
Valley switching flyback (pin HV)
(∆V/∆t)
vrec(fb)
flyback valley recognition
voltage change with time
−75 - +75 V/µs
t
d(vrec-swon)
valley recognition to switch-on
delay time
[5]
- 150 - ns
Soft start flyback (pin FBSENSE)
I
start(soft)fb
flyback soft start current −75 −60 −45 µA
V
start(soft)fb
flyback soft start voltage 0.43 0.49 0.54 V
R
start(soft)fb
flyback soft start resistance 12 - - kΩ
Overcurrent protection flyback (pin FBSENSE)
V
sense(fb)max
maximum flyback sense
voltage
∆V/∆t = 50 mV/µs 0.49 0.52 0.55 V
∆V/∆t = 200 mV/µs 0.52 0.55 0.58 V
t
leb(fb)
flyback leading edge blanking
time
255 305 355 ns
Driver (pin FBDRIVER)
I
src(FBDRIVER)
source current on pin
FBDRIVER
V
FBDRIVER
=2V - −0.5 - A
I
sink(FBDRIVER)
sink current on pin FBDRIVER V
FBDRIVER
= 2 V - 0.7 - A
V
FBDRIVER
=10V - 1.2 - A
V
O(FBDRIVER)(max)
maximum output voltage on
pin FBDRIVER
- 1112V
Latch input (pin LATCH)
V
prot(LATCH)
protection voltage on pin
LATCH
1.23 1.25 1.27 V
I
O(LATCH)
output current on pin LATCH V
prot(LATCH)
<V
LATCH
<V
oc(LATCH)
−85 −80 −75 µA
V
en(LATCH)
enable voltage on pin LATCH at start-up 1.30 1.35 1.40 V
V
hys(LATCH)
hysteresis voltage on pin
LATCH
V
en(LATCH)
− V
prot(LATCH)
80 100 140 mV
V
oc(LATCH)
open-circuit voltage on pin
LATCH
- 2.9 - V
Table 5. Characteristics
…continued
T
amb
=25
°
C; V
CC
= 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
TEA1750_2 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 02 — 15 December 2008 24 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
[1] For a typical application with a compensation network on pin PFCCOMP, like the example in Figure 3.
[2] Typically 120 mV above V
stop(fb)
.
[3] Minimum required voltage change time for valley recognition on pin PFCAUX.
[4] Minimum required time between demagnetization recognition and ∆V/∆t end.
[5] Guaranteed by design.
11. Application information
A power supply with the TEA1750 consists of a power factor correction circuit followed by
a flyback converter. See Figure 14.
Capacitor C
VCC
buffers the IC supply voltage, which is powered via the high voltage
rectified mains during start-up and via the auxiliary winding of the flyback converter during
operation. Sense resistors R
SENSE1
and R
SENSE2
convert the current through the
MOSFETs S1 and S2 into a voltage at pins PFCSENSE and FBSENSE. The values of
R
SENSE1
and R
SENSE2
define the maximum primary peak current in MOSFETs S1 and S2.
In the example given, the LATCH pin is connected to a Negative Temperature Coefficient
(NTC) resistor. When the resistance drops below (typ), the
protection is activated.
A capacitor C
TIMEOUT
is connected to the FBCTRL pin. For a 120 nF capacitor, typically
after 10 ms the time-out protection is activated. R
LOOP
is added so that the time-out
capacitor does not interfere with the normal regulation loop.
R
S1
and R
S2
are added to prevent the soft-start capacitors from being charged during
normal operation due to negative voltage spikes across the sense resistors.
Resistor R
AUX1
is added to protect the IC from damage during lightning events. For
applications with high transformer ringing frequencies (after the secondary stroke), the
PFCAUX pin should be connected via a capacitor and a resistor to the auxiliary winding. A
diode must than be placed from the ground connection to the PFCAUX pin.
Temperature protection
T
pl(IC)
IC protection level
temperature
130 140 150 °C
T
pl(IC)hys
hysteresis of IC protection
level temperature
-10-°C
Table 5. Characteristics
…continued
T
amb
=25
°
C; V
CC
= 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
V
prot LATCH()
I
O LATCH()
--------------------------------
15.6 kΩ=
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29

TEA1750T/N1/DG,518

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Buy TEA1750T/N1/DG,518
Manufacturer:
NXP Semiconductors
Description:
AC/DC Converters 12V -80uA 125KHz
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New from this manufacturer.
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