19-3175; Rev 1; 7/04
High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers
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擄C to +125擄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.
Features
鈾?/div>
Current-Mode Control with 47碌A(chǔ) (typ) Startup
Current
鈾?/div>
Oscillator Frequency Programmable to 2.5MHz
鈾?/div>
Resistor-Programmable 鹵4.5% Accurate
Switching Frequency
鈾?/div>
Dual Gate-Drive Output for Half/Full-Bridge or
Push-Pull Applications
鈾?/div>
Rectified 85VAC to 265VAC, or 36VDC to 72VDC
Input (MAX5069A/B)
鈾?/div>
Input Directly Driven from 10.8V to 24V
(MAX5069C/D)
鈾?/div>
Programmable Dead Time and Slope
Compensation
鈾?/div>
Programmable Startup Voltage (UVLO)
鈾?/div>
Programmable UVLO Hysteresis (MAX5069B/C)
鈾?/div>
Frequency Synchronization Input (MAX5069A/D)
鈾?/div>
-40擄C to +125擄C Automotive Temperature Range
鈾?/div>
16-Pin Thermally Enhanced TSSOP-EP Package
MAX5069
Ordering Information
PART
MAX5069AAUE
MAX5069BAUE
MAX5069CAUE
MAX5069DAUE
TEMP RANGE
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
-40擄C to +125擄C
PIN-PACKAGE
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
*EP
= Exposed pad.
Applications
Universal-Input AC Power Supplies
Isolated Telecom Power Supplies
Networking System Power Supplies
Server Power Supplies
Industrial Power Conversion
TOP VIEW
RT 1
SYNC(HYST*) 2
SCOMP 3
DT 4
UVLO/EN 5
FB 6
COMP 7
FLTINT 8
16 REG5
15 IN
14 V
CC
Pin Configuration
MAX5069
13 NDRVA
12 NDRVB
11 PGND
10 AGND
9
CS
TSSOP-EP
*MAX5069B/C.
Selector Guide appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
MAX5069 PDF文件相關(guān)型號
MAX5070,MAX5071
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