Rainbow Electronics MAX5069 - Manual

General Description
The MAX5069 is a high-frequency, current-mode,
pulse-width modulation (PWM) controller (with dual
MOSFET drivers) that integrates all the building blocks
necessary for implementing AC-DC or DC-DC fixed-fre-
quency power supplies. Isolated or nonisolated push-
pull and half/full-bridge power supplies are easily
constructed using either primary- or secondary-side
regulation. Current-mode control with leading-edge
blanking simplifies control-loop design and a program-
mable internal slope-compensation circuit stabilizes the
current loop when operating at duty cycles above 50%.
An input undervoltage lockout (UVLO) programs the
input-supply startup voltage and ensures proper opera-
tion during brownout conditions.
A single external resistor programs the oscillator frequen-
cy from 50kHz to 2.5MHz. The MAX5069A/D provide a
SYNC input for synchronization to an external clock. The
maximum FET-driver duty cycle for the MAX5069 is 50%.
Programmable dead time allows additional flexibility in
optimizing magnetic design and overcoming parasitic
effects. Programmable hiccup current limit provides
additional protection under severe faults.
The MAX5069 is specified over the -40°C to +125°C auto-
motive temperature range and is available in a
16-pin thermally enhanced TSSOP-EP package. Refer to
the MAX5068 data sheet for single FET-driver applications.
Warning: The MAX5069 is designed to work with high
voltages. Exercise caution.
Applications
Universal-Input AC Power Supplies
Isolated Telecom Power Supplies
Networking System Power Supplies
Server Power Supplies
Industrial Power Conversion
Features
♦ Current-Mode Control with 47µA (typ) Startup
Current
♦ Oscillator Frequency Programmable to 2.5MHz
♦ Resistor-Programmable ±4.5% Accurate
Switching Frequency
♦ Dual Gate-Drive Output for Half/Full-Bridge or
Push-Pull Applications
♦ Rectified 85VAC to 265VAC, or 36VDC to 72VDC
Input (MAX5069A/B)
♦ Input Directly Driven from 10.8V to 24V
(MAX5069C/D)
♦ Programmable Dead Time and Slope
Compensation
♦ Programmable Startup Voltage (UVLO)
♦ Programmable UVLO Hysteresis (MAX5069B/C)
♦ Frequency Synchronization Input (MAX5069A/D)
♦ -40°C to +125°C Automotive Temperature Range
♦ 16-Pin Thermally Enhanced TSSOP-EP Package
MAX5069
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
________________________________________________________________ Maxim Integrated Products 1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
RT REG5
IN
V CC
NDRVA
NDRVB
PGND
AGND
CS
TOP VIEW
MAX5069
TSSOP-EP
SYNC(HYST*)
SCOMP
FB
DT
UVLO/EN
COMP
FLTINT
*MAX5069B/C.
Pin Configuration
Ordering Information
19-3175; Rev 0; 2/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
* Future product—contact factory for availability.
**EP = Exposed pad.
PART TEMP RANGE PIN-PACKAGE
MAX5069AAUE* -40°C to +125°C 16 TSSOP-EP**
MAX5069BAUE -40°C to +125°C 16 TSSOP-EP**
MAX5069CAUE -40°C to +125°C 16 TSSOP-EP**
MAX5069DAUE* -40°C to +125°C 16 TSSOP-EP**
Selector Guide appears at end of data sheet.