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AN10868 Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer AN10868
Beschreibung GreenChip TEA1733 series fixed frequency flyback controller
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 46 Seiten
AN10868 Datasheet, Funktion
AN10868
GreenChip TEA1733 series fixed frequency flyback controller
Rev. 3.1 — 22 May 2013
Application note
Document information
Info Content
Keywords
GreenChip, TEA1733, SMPS, flyback, adapter, notebook, LCD monitor.
Abstract
The TEA1733 is a low cost member of the GreenChip family. It is a
fixed-frequency flyback controller intended for power supplies up to 75 W
for applications such as notebooks, printers and LCD monitors.
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AN10868 Datasheet, Funktion
NXP Semiconductors
AN10868
GreenChip TEA1733 series fixed frequency flyback controller
2. Pin description
Table 2. Pin description
Pin number Pin name Description
1
VCC
Supply voltage
At mains switch-on, the capacitor connected to this pin is charged by an external start-up
circuit.
When the voltage on the pin exceeds Vstartup the IC wakes up from Power-down mode and
checks if all other conditions are met to start switching.
When the voltage on the pin drops below Vth(UVLO) the TEA1733 stops switching and enters
Power-down mode. (When the voltage rises above Vstartup a normal start-up procedure is
carried out.)
During a safe restart procedure, this pin is internally clamped to a voltage just above Vstartup.
During latched protection this pin is internally clamped to a voltage just above Vrst(latch) to
enable fast latch reset after unplugging the mains.
Vstartup = 20.6 V (typ.)
Vth(UVLO) = 12.2 V (typ.)
Vclamp(VCC) during restart = Vstartup + 1 V
Vclamp(VCC) during latched protection = Vrst(latch) + 1 V
Vrst(latch) = 5 V
Absolute maximum rating: VCC = 30 V (35 V for 100 ms).
2
GND
Ground
3
DRIVER
Gate driver output for MOSFET
Isource(DRIVER) = 0.3 A (typ.) at VDRIVER = 2 V
Isink(DRIVER) = 0.3 A (typ.) at VDRIVER = 2 V
Isink(DRIVER) = 0.75 A (typ.) at VDRIVER = 10 V
Frequency modulation
Modulation range = 4 kHz (5 kHz in 91.5 kHz switching frequency versions and
7 kHz in the 123 kHz version)
Modulation frequency = 280 Hz
AN10868
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 22 May 2013
© NXP B.V. 2013. All rights reserved.
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AN10868 pdf, datenblatt
NXP Semiconductors
AN10868
GreenChip TEA1733 series fixed frequency flyback controller
2.0 019aaa158
1.8
1.6
115 V (AC)
1.4
1.2
90 V (AC)
1.0
0.8
0.6
1234
start-up time (s)
Fig 4. Start-up resistor value as a function of start-up time (VCC capacitance 4.8 F)
100
power at 230 V (AC)
(mW)
80
019aaa159
60
90 V (AC)
40 115 V (AC)
20
1234
start-up time (s)
Fig 5. Power consumption of start-up circuit at 230 V (AC) as a function of start-up time
(VCC capacitance 4.8 F)
Figure 5 shows the power consumed by the combined start-up and X-cap discharge
circuit as a function of the start-up time. The graph shows how to save power:
More than 10 mW no-load power can be saved by increasing the start-up time
(at 115 V (AC)) from 2 s to 3 s.
Approximately 17 mW no-load power can be saved by specifying the start-up time at
115 V (AC) instead of 90 V (AC).
AN10868
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 22 May 2013
© NXP B.V. 2013. All rights reserved.
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