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ML4825, ML4825CP, ML4825CQ

Table of contents:
Info of ML4825
Info of ML4825CP
Info of ML4825CQ

ML4825, ML4825CP, ML4825CQ Selling Leads, Datasheet

MFG:ML Package Cooled:DIP D/C:DIP

ML4825, ML4825CP, ML4825CQ Datasheet download

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Part Number: ML4825

MFG: ML

Package Cooled: DIP

D/C: DIP

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ML4825 General Description

The ML4825 High Frequency PWM Controller is an IC controller optimized for use in Switch Mode Power Supply designs running at frequencies to 1MHz.

Propagation delays are minimal through the comparators and logic for reliable high frequency operation while slew rate and bandwidth are maximized on the error amplifier.

This controller is designed to work in either voltage or current mode and provides for input voltage feed forward.

A 1V threshold current limit comparator provides cycleby- cycle current limit while exceeding a 1.4V threshold initiates a soft-start cycle. The soft start pin doubles as a maximum duty cycle clamp. An under-voltage lockout circuit with 800mV of hysteresis assures low startup current and drives the outputs low.

This controller is similar in architecture and performance to the UC1825 controller, however the ML4825 includes many features not found on the 1825. These features are set in Italics.

ML4825 Maximum Ratings

Supply Voltage (V_C, V_CC) ........................................... 30V
Output Current, Source or Sink (OUT A, OUT B)
DC ....................................................................... 0.5A
Pulse (0.5s) ......................................................... 2.0A
Analog Inputs
(INV, NI, RAMP)................................ GND 0.3V to 7V
(SS, I_LIM) ........................................... GND 0.3V to 6V
CLOCK Output Current ......................................5mA
E/A OUT Output Current ..................................... 5mA
Soft Start Sink Current ...................................... 20mA
R_T Charging Current ..........................................5mA
Junction Temperature
ML4825IX, ML4825CX ........................................ 150
Storage Temperature Range ...............65 to 150
Lead Temperature (soldering 10 sec.) ...............260
Thermal Resistance (_JA)
Plastic DIP or SOIC ......................................... 65/W
Plastic Chip Carrier (PCC) ................................ 60/W

ML4825 Features

· Practical operation at switching frequencies to 1.0MHz
· High current (2A peak) dual totem pole outputs
· Wide bandwidth error amplifier
· Fully latched logic with double pulse suppression
· Pulse-by-pulse current limiting
· Soft start and maximum duty cycle control
· Under voltage lockout with hysteresis
· Precision trimmed 5.1V bandgap reference
· Pin compatible improved replacement for UC1825
· Fast shut down path from current limit to outputs
· Outputs preset to known condition after under voltage lockout
· Soft start latch ensures full soft start cycle
· Outputs pull low for undervotage lockout

ML4825 Connection Diagram

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