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NXP Semiconductors - GreenChip III SMPS control IC

Numéro de référence TEA1733LP
Description GreenChip III SMPS control IC
Fabricant NXP Semiconductors 
Logo NXP Semiconductors 





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TEA1733LP fiche technique
TEA1733(L)T; TEA1733(L)P
GreenChip III SMPS control IC
Rev. 03 — 20 May 2010
Product data sheet
1. General description
The TEA1733T, TEA1733P, TEA1733LT and TEA1733LP are low cost Switched Mode
Power Supply (SMPS) controller ICs intended for flyback topologies. They operate 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) 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) 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 series 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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