|
|
Teilenummer | AN10868 |
|
Beschreibung | GreenChip TEA1733 series fixed frequency flyback controller | |
Hersteller | NXP Semiconductors | |
Logo | ||
Gesamt 46 Seiten 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.
http://www.Datasheet4U.com
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.
6 of 46
6 Page 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.
12 of 46
12 Page | ||
Seiten | Gesamt 46 Seiten | |
PDF Download | [ AN10868 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
AN10861 | GreenChip III TEA1752 integrated PFC and flyback controller | NXP Semiconductors |
AN10868 | GreenChip TEA1733 series fixed frequency flyback controller | NXP Semiconductors |
Teilenummer | Beschreibung | Hersteller |
CD40175BC | Hex D-Type Flip-Flop / Quad D-Type Flip-Flop. |
Fairchild Semiconductor |
KTD1146 | EPITAXIAL PLANAR NPN TRANSISTOR. |
KEC |
www.Datenblatt-PDF.com | 2020 | Kontakt | Suche |