General description

The TEA1833LTS is a low-cost switched-mode power supply (SMPS) controller

IC intended for flyback topologies. The TEA1833LTS 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 TEA1833LTS IC features overpower protection (OPP). The controller accepts an

overpower situation up to 200 % for a limited time.

Mains undervoltage protection (brownin/brownout), 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 22 % of the maximum peak

current. The switching frequency is reduced to limit the 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 TEA1833LTS makes the design of low-cost, highly efficient, and reliable supplies

easier by requiring a minimum number of external components. The device is especially

suited for medium power applications.

Features and benefits

• SMPS controller IC enabling low-cost applications

• Large input voltage range (10.5 V to 36 V)

• Integrated overvoltage protection (OVP) on the VCC pin

• Accurate overvoltage protection (OVP) via the ISENSE pin

• Dedicated burst mode, allowing a low VCC capacitor value

• Very low supply current during start-up and restart (11 μA typical)

• Low supply current during normal operation (0.58 mA typical without load)

• Adaptive internal overpower timeout

• Overpower protection including high/low line compensation

• 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

• Peak power operation up to 200 % by frequency increase and peak current increase

• Slope compensation for CCM operation

• Limitation of switching frequency at high mains to reduce the maximum drain voltage

• Integrated soft-start

• Drive capability 300 mA source, 750 mA sink

• Maximum duty cycle set at 90 %

• Mains undervoltage protection (brownin/brownout)

• Output short-circuit protection (OSCP), avoiding transformer saturation

• External overtemperature protection (OTP)

• IC overtemperature protection

• Maximum duty cycle protection and brownin/brownout protection cause a restart, all

other protections are latched

Applications

• All applications that require an efficient and cost-effective power supply solution. The

TEA1833LTS is especially suited for medium power applications.