CS5651

Features:

·Oscillator has Precise Duty Cycle Limit and Frequency Control
·500kHz Current Mode Operation
·Automatic Feed Forward Compensation
·Separate Latching PWMs for Cycle-By-Cycle Current Limiting
·Internally Trimmed Reference with Undervoltage Lockout
·Switchable Second Output
·Two High Current Totem Pole Outputs
·Input Undervoltage Lockout with Hysteresis


Pinout




Specifications

Output Current, Source or Sink (Note 1) ..........................................................................400mA
Output Energy (capacitive load per cycle) ...........................................................................5.0µJ
Current Sense, Enable and Voltage.........................................................................-0.3 to +5.5V
Feedback Inputs
Sync Input
           High State (Voltage)....................................................................................................5.5V
           Low State (Reverse Current)...................................................................................-5.0mA
Error Amp Output Sink Current..............................................................................................10mA
Storage Temperature Range ....................................................................................-65 to +150
Operating Junction Temperature..........................................................................................+150
Lead Temperature Soldering
           Wave Solder (through hole styles only).........................................10 sec. max, 260 peak
           Reflow (SMD styles only)............................................60 sec. max above 183, 230 peak


Description

The CS5651 is a high performance, fixed frequency, dual current mode controller specifically designed for Off-Line and DC to DC converter applications. It offers the designer a cost effective solution with minimal external components. This integrated circuit features a unique oscillator for precise duty cycle limit and frequency control, a temperature compensated reference, two high gain error amplifiers, two current sensing comparators, and two high current totem pole outputs ideally suited for driving power MOSFETs.

One of the outputs CS5651, VOUT2 is switchable via the ENABLE2 pin.

Also included are protective features consisting of input and reference undervoltage lockouts, each with hysteresis; cycle-by-cycle current limiting; and a latch for single pulse metering of each output.

The CS5651 is pin compatible with the MC34065H.