The TEA1832LTS is a low-cost Switched Mode Power Supply (SMPS) controller IC intended for flyback topologies. The TEA1832LTS 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 TEA1832LTS IC features OverPower Protection (OPP). The controller accepts an overpower situation up to 200 % for a limited amount of 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 TEA1832LTS 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)
- Internal overpower time-out
- 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
- 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 TEA1832LTS is especially suited for medium power applications.
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Demo board description
The TEA1832 demo board is a small and low cost solution for a 45W ultra book adapter or any low power adapter solution. The power supply can deliver a peak power of 90 W for 2 ms. The application is EMI CISPR22, ENERGY STAR, DoE and CoC compliant. The used topology is fixed frequency flyback. Several protections and compensation features are built-in (see features and benefits list). Best in class efficiency and standby power consumption performance.
Features
- IC used: TEA1832T TSOP6 fixed frequency controller
- Universal mains operation: 90 - 264 V (AC)
- Output: 45 W; 19.5 V
- Average efficiency: > 89% (end of cable)
- Standby power consumtion: <55 mW (at 230 V (AC))
- Accurate output overvoltage protection
- Overtemperature protection
- Brown-in/out protection
- 200 % peak power for 2 ms
- OverCurrent protection (OCP)
- OverPower protection (OPP)
- High/low line compensation
- Low ripple and noise
- Small form factor
- Low-cost implementation
- ENERGY STAR, DoE and CoC compliant
- EMI CISPR22 compliant
Descriptive summary
Demobox content
Demoboard, Quick start guide
Fonte - NXP Semiconductors
03 de fevereiro de 2015
