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| 文章來源： 更新時(shí)間：2015/4/28 9:28:00 |
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NXP公司的TEA1720B3T是小型低成本開關(guān)電源(SMPS)控制器,用于12.5W充電器,在工作模式最小化音頻噪音,和USB電池充電和能源之星2.0兼容,無負(fù)載功耗< 20 mW,具有多種保護(hù)特性,主要用在智能手機(jī)和媒體平板電腦12.5W電池充電器以及TV和臺(tái)式PC的待機(jī)電源.本文介紹了TEA1720B3T 主要特性和優(yōu)勢(shì),功能框圖, 典型應(yīng)用電路圖以及TEA1720ADB1132 10W充電器主要特性,輸入和輸出指標(biāo),電路圖,材料清單和PCB設(shè)計(jì)文件.
The TEA1720B3T is a small and low cost Switched Mode Power Supply (SMPS) controller IC for low power applications (up to 12.5 W) and operates directly from the rectified universal mains input. The device includes an emitter switch for driving an external low-cost bipolar power transistor. It has been optimized for flyback converter topologies to provide high-efficiency over the entire load range with ultra-low power consumption in the no-load condition. It provides a circuit for fast start-up directly from the rectified mains voltage without any external bleeder circuits.
The converter operates as a regulated voltage source from no-load up to the maximum output current and operates as current source that delivers the maximum current over a broad output voltage range. Using the TEA1720B3T a low power converter can be built at minimum cost and with the minimum number of external components.
The controller regulates the output voltage with primary-side sensing which eliminates the need for an additional secondary feedback circuitry and simplifies the design. At higher power levels, a frequency and current control mode is used. It operates with Burst mode control at low power levels and no-load condition. The burst mode minimizes audible noise and provides an energy save state which reduces the power consumption in no-load condition. The Burst mode frequency of 400 Hz enables no-load power consumption < 20 mW at high mains input.
A fast transient response is obtained when the TEA1720B3T is used in combination with the TEA1705 transient controller at the secondary side. The fast transient response ensures excellent control of the output voltage at load steps, at minimum no load power and at small output capacitors.
TEA1720B3T 主要特性和優(yōu)勢(shì):
2.1 Power features
Low power SMPS controller designed for charger applications up to 12.5 W
Primary sensing for control of the output voltage without optocoupler and secondary feedback circuitry
Minimizes audible noise in all operation modes
USB battery charging and Energy Star 2.0 compliant
Jitter function for reduced EMI
Cable compensation 0.3 V at maximum power
Fast transient response when TEA1720B3T is used with the TEA1705 transient controller at the secondary side
Integrated emitter switch to control external low-cost bipolar power transistor
2.2 Green features
Enables no-load power consumption < 20 mW
Very low supply current in no-load condition with energy save mode
Incorporates a high voltage start-up circuit with zero current consumption under normal switching operation
Available in halogen-free and Restriction of Hazardous Substances (RoHS) SO8 package
2.3 Protection features
OverVoltage Protection (OVP) on feedback control pin (FB) with safe restart
UnderVoltage LockOut (UVLO) on IC supply pin
OverTemperature Protection (OTP)
Soft-start by reduced peak current for zero and low output voltage
Demagnetization protection for guaranteed discontinuous conduction mode operation
Open and short-circuit protection of the Feedback control (FB) pin
Short-circuit protection of the charger output
TEA1720B3T應(yīng)用:
Battery chargers for smart phones and media tablets up to 12.5 W
Standby supply for TV and desktop PC
圖1. TEA1720B3T功能框圖
圖2. TEA1720B3T典型應(yīng)用電路圖
TEA1720ADB1132 10W充電器
This user manual describes the TEA1720ADB1132 10W Constant Voltage/Constant Current (CV/CC) universal input power supply for tablet adapters/chargers. This demo board is based on the GreenChip Smart Power TEA1720B3T and the TEA1705 transient controller. The TEA1720B3T and TEA1705 application enables a no-load power consumption of less than 20 mW and a low external component count for cost-effective applications. In addition, the TEA1720B3T provides advanced control modes for optimal performance. The TEA1705 transient controller continuously monitors the output voltage. When the output voltage drops below the detection level Vdet (VCC), a transient interrupt signal is generated to wake up the TEA1720B3T.
TEA1720ADB1132 10W充電器主要特性:
1 Power features
• Low component count for cost-effective design
• Universal mains input
• Isolated output
• Highly efficient > 80 %
• Primary sensing for control of the output voltage without optocoupler and secondary feedback circuitry
• Built-in emitter switch for driving low-cost NPN high-voltage transistor
• Minimizes audible noise in all operation modes
• Energy Star 2.0 compliant
• Jitter function for reduced EMI
• Excellent transient performance with ultra low no-load power and small output capacitors
• Cable compensation 0.3 V at maximum power
2 Green features
• No-load power consumption < 20 mW
• Very low supply current in no-load condition with energy save mode
• Incorporates a high-voltage start-up circuit with zero current consumption under normal switching operation
3 Protection features
• OverVoltage Protection (OVP) with auto-restart
• UnderVoltage LockOut (UVLO) and OverVoltage Protection (OVP) on IC supply pin
• OverTemperature Protection (OTP)
• Sense pin short protection
• Hiccup function for automatic switch-off at continuous too low output voltage
• Demagnetization protection for guaranteed discontinuous conduction mode operation
• Open and short-circuit protection of the Feedback control (FB) pin
• Short-circuit protection of the charger output
TEA1720ADB1132 10W充電器輸入指標(biāo):
TEA1720ADB1132 10W充電器輸出指標(biāo):
圖3. TEA1720ADB1132 10W EVD充電器外形圖
圖4.TEA1720ADB1132 10W充電器電路圖
圖5.TEA1720ADB1132 10W充電器PCB元件布局圖
圖6.TEA1720ADB1132 10W充電器PCB設(shè)計(jì)圖
TEA1720ADB1132 10W充電器材料清單:
圖7.TEA1720ADB1132 10W充電器變壓器電路圖 |
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