TEA1733LT View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
TEA1733LT Datasheet PDF : 20 Pages
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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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