TEA1733LT 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1733LT

GreenChip III SMPS control IC

NXP Semiconductors. 

TEA1733T; TEA1733LT

GreenChip III SMPS control IC

Rev. 02 — 26 March 2010

Product data sheet

1. General description

The TEA1733T and TEA1733LT are low cost Switched Mode Power Supply (SMPS)

controller ICs intended for flyback topologies. The TEA1733(L) operates in fixed

frequency mode. To reduce ElectroMagnetic Interference (EMI), frequency jitter has been

implemented. Slope compensation is integrated for Continuous Conduction Mode (CCM)

operation.

The TEA1733(L) IC incorporates 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) and OverVoltage Protection (OVP), output 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 TEA1733(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)

„ Very low supply current during start-up and restart (typically 10 μA)

„ Low supply current during normal operation (typically 0.5 mA 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 with fixed minimum peak current to maintain high-efficiency at

low output power levels

„ Slope compensation for CCM operation

„ Low and adjustable OverCurrent Protection (OCP) trip level

„ Adjustable soft start operation

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