Friday, October 14, 2016
STMicroelectronics - EVALSTSR30-60W. Synchronous rectification using L6668 and STSR30.
EVALSTSR30-60W: 60W AC-DC adapter
The converter works in both Continuous and Discontinuous conduction mode depending on the input voltage (the circuit has a wide input voltage range) and the output load. The 68-kHz switching frequency provides a good compromise between the transformer size and the harmonics of the switching frequency, optimizing input filter.
The input section includes protection elements (varistor, fuse and NTC for inrush current limiting), a standard Pi-filter for EMC suppression, a bridge and an electrolytic bulk capacitor as the front-end AC-DC converter. The transformer is a layer type, uses a standard ETD34 ferrite core and is designed to have a reflected voltage of 95V. The power MOS is a 700V - 1Ω and a transil clamp network is used for leakage inductance demagnetization.
Wednesday, April 14, 2010
"Energy-efficient AC/DC and DC/DC embedded power, indoor/ outdoor energy systems."
- Output overcurrent protection
- Industry standard eighth brick
- Positive remote On/Off logic
- Delivers up to 240W of output power
- High efficiency: 96% at 9.6V full load
Emerson Network Power - Power Converters
Types of Power Supplies Manufactured -
"Open-frame and enclosed models, highly configurable modular power supplies, rack-mount bulk power units, DIN rail power supplies and external power adapters"
This is a Medical Grade Step Down Power supply from Emerson. In a 2x4x1U size, it has integrated Overload and Overvoltage protection and Class B EMI filter.
LPT100-M AC-DC Power Supply - Emerson Network Power
A 130 Watt supply with a 18 Amp maximum current with triple outputs. It has a Efficiency of around 82% at full load.
Some Specs and Features
- Input Voltage: 90 V to 264 V
- Output Voltage: -15 V to 24 V
- Medical and ITE safeties
- Active power factor correction
- Remote sense
- EN61000-3-2 compliant
- Adjustable outputs
1050 Dearborn Drive Columbus OH 43085, United States
Tuesday, April 13, 2010
TDK Lambda - SMPS UPS Power Supply Specialist
Uninterruptible power systems (UPS) are backup power supplies that use a built-in battery to stably supply continuous clean power to connected devices when the regular supply power shuts down due to a power failure or other power problem. TDK-Lambda offers both these types of power supplies".
CME150-24 - Single output AC-DC converter 150 - TDK Lambda
Output voltage of 24V at Max output current of 6.3A and Efficiency of 82%
- Leakage current 0.3mA or less (at 265VAC)
- Medical safety standard (IEC60601-1) approved.
- Max output power 151.2W
- Input voltage range AC 85 - 265 V
- Input voltage range DC 120 - 370 V
- Input frequency 47 - 63 Hz
American Power Design (APD) is a leading supplier of high voltage DC to DC converters. Our product offering is from 0.5 to 200 watts with outputs to 8000Vdc. All products are designed such that our customers can select the output voltage of their choice at no additional cost.
The A10 Series low profile high voltage DC/DC converter offers a highly regulated high voltage isolated output in a six-sided copper case. Their small size, wide input, and excellent regulation make them ideally suited for applications that demand a high degree of performance. All models will tolerate a short circuit indefinitely.
A10 Series 10 Watts - Low Profile with a Typical Efficiency of 83%. It has High Regulation and a 1000Vdc Isolation that ensures safety and reliability.
Ultra-Wide Input Ranges - 9-36Vdc, 20-60Vdc, 36-72Vdc
APD can custom tailor designs to meet your exact electrical and mechanical specifications. We will design, configure, and package assemblies using state of the art technology minimizing space requirements.
American Power Design, Inc.
3 Industrial Drive Windham, NH 03087, USA
Sunday, March 16, 2008
- Complete PWM Power-Control Circuitry
- Uncommitted Outputs for 200-mA Sink or Source Current
- Output Control Selects Single-Ended or Push-Pull Operation
- Internal Circuitry Prohibits Double Pulse at Either Output
- Variable Dead Time Provides Control Over Total Range
- Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance
- Circuit Architecture Allows Easy Synchronization
The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.
The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.
View Application Notes for PWM Power Supply Controllers
TL494 Related Links
Saturday, September 29, 2007
100kHz Half Bridge Convertor - SG3525
The SG3525A pulse width modulator control circuit offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on-chip +5.1 V reference is trimmed to +/-1% and the error amplifier has an input common-mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. Half Bridge, Push-Pull.
- 8.0 V to 35 V Operation
- 5.1 V +/- 1.0% Trimmed Reference
- 100 Hz to 400 kHz Oscillator Range
- Separate Oscillator Sync Pin
- Adjustable Deadtime Control
- Input Undervoltage Lockout
- Latching PWM to Prevent Multiple Pulses
- Pulse-by-Pulse Shutdown
- Dual Source/Sink Outputs: +/- 400 mA Peak
Monday, May 07, 2007
250 W S.M.P.S. with Power-FETs
Experiments with the PC power supply encouraged me to an "advancement " design. The new power supply is also a forward converter with a half-bridge topology. The difference to the modified PC power supply consists in the following items: Two power FETs instead of bipolar transistors used as power switches.
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