TEA1738T

更新时间： 2024-11-11 08:50:15

品牌	Logo	应用领域
恩智浦 - NXP		开关
页数	文件大小	规格书
21页	177K
描述
GreenChip SMPS control IC Adjustable overpower time-out

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TEA1738T 数据手册

TEA1738T; TEA1738LT

GreenChip SMPS control IC

Rev. 1 — 31 December 2010

Preliminary data sheet

1. General description

The TEA1738(L) is a low cost Switched Mode Power Supply (SMPS) controller IC

intended for flyback topologies. The TEA1738(L) operates in peak current and frequency

control mode. Frequency jitter has been implemented to reduce ElectroMagnetic

Interference (EMI). Slope compensation is integrated for Continuous Conduction Mode

(CCM) operation.

The TEA1738(L) IC includes OverPower Protection (OPP). This enables the controller to

operate under overpower situations for a limited amount of time.

Two pins, VINSENSE and PROTECT, are reserved for protection purposes. Input

UnderVoltage Protection (UVP), output OverVoltage Protection (OVP) and

OverTemperature Protection (OTP) can be implemented using a minimal number of

external components.

At low power levels the primary peak current is set to 25 % of the maximum peak current

and the switching frequency is reduced to limit switching losses. The combination of fixed

frequency operation at high output power and frequency reduction at low output power

provides high efficiency over the total load range.

The TEA1738(L) enables low cost, highly efficient and reliable supplies for power

requirements up to 75 W to be designed easily and with a minimum number of external

components.

2. Features and benefits

2.1 Features

 SMPS controller IC enabling low-cost applications

 Large input voltage range (12 V to 30 V)

 Integrated OverVoltage Protection (OVP) on pin VCC

 Very low supply current during start-up and restart (10 A typical)

 Low supply current during normal operation (0.55 mA typical without load)

 Overpower or high/low line compensation

 Adjustable overpower time-out

 Adjustable overpower restart timer

 Fixed switching frequency with frequency jitter to reduce EMI

 Frequency reduction at medium power operation to maintain high efficiency

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