General description

The TEA1833TS is a low-cost switched-mode power supply (SMPS) controller IC

intended for flyback topologies. The TEA1833TS 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 TEA1833TS 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. To limit the switching losses, the switching frequency is reduced. 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 TEA1833TS 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

• Wide 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

• Internal VCC OVP, external OVP, internal OTP, and external OTP are latched

protections; all other protections cause a restart

Applications

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

TEA1833TS is especially suited for medium power applications.