Part Number: LM5026

Function: Active Clamp Current Mode PWM Controller

Package: WSON, TSSOP 16 Pin Type

Manufacturer: Texas Instruments

Pinouts:

 

Description

The LM5026 PWM controller contains all of the features necessary to implement power converters utilizing the active clamp / reset technique with current mode control. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B).

The device can be configured to control either a P-Channel or N-Channel clamp switch. The main gate driver features a compound configuration, consisting of both MOS and Bipolar devices, providing superior gate drive characteristics. The LM5026 can be configured to operate with bias voltages over a wide input range of 8V to 100V.

Additional features include programmable maximum duty cycle, line under-voltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable timeout delay, PWM slope compensation, soft-start, 1MHz capable oscillator with synchronization input / output capability, precision reference and thermal shutdown.

Features

• Current Mode Control
• Internal 100V Start-up Bias Regulator
• 3A Compound Main Gate Driver
• High Bandwidth Opto-coupler Interface
• Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
• Versatile Dual Mode Over-Current Protection with hiccup delay timer
• Programmable Overlap or Deadtime between the Main and Active Clamp Outputs
• Programmable Maximum Duty Cycle Clamp
• Programmable Soft-start
• Leading Edge Blanking
• Resistor Programmed 1MHz Capable Oscillator
• Oscillator Sync I/O Capability
• Precision 5V Reference

Applications

1. Server Power Supplies
2. 48-V Telecom Power Supplies
3. High Efficiency DC–DC Power Supplies

Other data sheets are available within the file:

LM5026MT, LM5026MT/NOPB, LM5026MTX/NOPB, LM5026SD/NOPB

LM5026 Datasheet PDF Download

Part Number: OB2273AP, OB2273MP

Function: High Performance Current Mode PWM Controller

Package: SOT23-5, DIP 8 Pin Type

Manufacturer: On-Bright

Image and Pinouts:

Description

The OB2273AP is a highly integrated current mode PWM control IC optimized for high performance, low standby power and cost effective offline flyback converter applications.It offers complete protection coverage with auto-recovery including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), and VDD under voltage lockout (UVLO). It also provides the protections with latched shut down including over temperature protection (OTP), and over voltage (fixed or adjustable) protection (OVP).

Features

1. Power on Soft Start Reducing MOSFET Vds Stress

2. Frequency shuffling for EMI

3. Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design

4. Audio Noise Free Operation

5. Fixed 65KHZ Switching Frequency

6. Comprehensive Protection Coverage

Odering Information and Typical Applications:

Applications:

1. Battery Charger

2. Power Adaptor

3. Set-Top Box Power Supplies

4. Open-frame SMPS

OB2273AP Datasheet PDF Download

Other data sheets are available within the file: OB2273, 0B2273, 0B2273AP, OB2273MP