NXP’s TEA1733MT is a TEA1733 series GreenChip switching power supply (SMPS) control IC, which is suitable for low-cost flyback topology, works in fixed frequency mode, and frequency jitter reduces EMI. The input voltage is 12V-30V, the current for starting and restarting is very low, only 10uA, and the working current when there is no load is 0.5mA, which is suitable for switching power supplies below 75W. This article introduces the main features, block diagram, typical configuration diagram and typical application circuit diagram of TEA1733MT as well as the typical application circuit diagram of TEA1733.
TEA1733MT: GreenChip SMPS control IC
The TEA1733MT is a low cost Switched Mode Power Supply (SMPS) controller IC intended for flyback topologies. It operates in fixed frequency mode. Frequency jitter has been implemented to reduce ElectroMagnetic Interference (EMI). Slope compensation is integrated for Continuous Conduction Mode (CCM ) operation.
The TEA1733MT 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) 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 TEA1733MT 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.
Main features of TEA1733MT:
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 uA)
Low supply current during normal operation (typically 0.55 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
Two protection inputs (eg for input UVP and OVP, OTP and output OVP)
IC overtemperature protection
All applications requiring efficient and cost-effective power supply solutions up to
figure 1. TEA1733MT block diagram
figure 2. Typical configuration diagram of TEA1733MT
image 3. Typical application circuit diagram of TEA1733MT
Figure 4. Typical application circuit diagram of TEA1733
For details, see: