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AN10981のメーカーはNXP Semiconductorsです、この部品の機能は「GreenChip TEA1738 series fixed frequency flyback controller」です。 |
部品番号 | AN10981 |
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部品説明 | GreenChip TEA1738 series fixed frequency flyback controller | ||
メーカ | NXP Semiconductors | ||
ロゴ | |||
このページの下部にプレビューとAN10981ダウンロード(pdfファイル)リンクがあります。 Total 30 pages
AN10981
GreenChip TEA1738 series fixed frequency flyback controller
Rev. 1.1 — 18 April 2011
Application note
Document information
Info Content
Keywords
GreenChip, TEA1738, SMPS, flyback, adapter, notebook, LCD monitor.
Abstract
The TEA1738 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
1 Page NXP Semiconductors
AN10981
GreenChip TEA1738 series fixed frequency flyback controller
1. Introduction
The TEA1738 is a fixed frequency flyback controller that can be used for Discontinuous
Conduction Mode (DCM) as well as Continuous Conduction Mode (CCM).
1.1 Scope
This application note describes the functionality of the TEA1738 series. Fixed-frequency
flyback fundamentals and calculation of transformer and other large signal parts are not
dealt with in this application note.
1.2 Features
• SMPS controller IC enabling low cost applications
• Large input voltage range (12 V to 30 V, 35 V peak allowed for 100 ms)
• Very low supply current during start and restart (typically 10 μA)
• Low supply current during normal operation (typically 500 μA, no load)
• Overpower compensation (high/low line compensation)
• Adjustable overpower time-out
• Adjustable overpower restart timer
• Fixed frequency with frequency jitter to reduce EMI
• Frequency reduction with fixed minimum peak current at low power operation to
maintain high efficiency at low output power levels
• Frequency increase during peak power (for more output power from same core)
• Slope compensation for CCM operation
• Low and adjustable OverCurrent Protection (OCP) trip level
• Soft start
• Two independent general purpose protection inputs combined on a single pin (e.g. for
OverTemperature Protection (OTP) and output OverVoltage Protection (OVP))
• Internal OverVoltage Protection (triggers latched protection mode if VCC pin
exceeds 30 V)
• Internal OTP
1.3 Applications
The TEA1738 is intended for applications that require an efficient and cost-effective power
supply solution up to 75 W such as:
• Notebooks
• LCD monitors
• Printers
AN10981
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 18 April 2011
© NXP B.V. 2011. All rights reserved.
3 of 44
3Pages NXP Semiconductors
AN10981
GreenChip TEA1738 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 TEA1738 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.
An internal OverVoltage Protection sets the IC to latched off-state when the voltage on the
VCC pin exceeds 30 V for 8 consecutive switching cycles.
• Vstartup = 20.6 V (typ. for TEA1738T and TEA1738LT or 13V (typ.) for TEA1738FT and
TEA1738GT)
• Vth(UVLO) = 12.2 V (typ.)
• Vclamp(VCC) during restart = Vstartup +1V
• Vclamp(VCC) during latched protection = Vrst(latch) +1V
• Vrst(latch) =5V
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 =2V
• Isink(DRIVER) = 0.3 A (typ.) at VDRIVER =2 V
• Isink(DRIVER) = 0.75 A (typ.) at VDRIVER =1 0V
Frequency modulation
• Modulation range = ± 4k Hz
• Modulation frequency = 280 Hz
AN10981
Application note
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 18 April 2011
© NXP B.V. 2011. All rights reserved.
6 of 44
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ページ | 合計 : 30 ページ | ||
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PDF ダウンロード | [ AN10981 データシート.PDF ] |
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部品番号 | 部品説明 | メーカ |
AN10981 | GreenChip TEA1738 series fixed frequency flyback controller | NXP Semiconductors |