MAX5071 Maxim Integrated Products, MAX5071 Datasheet
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MAX5071
Manufacturer Part Number
MAX5071
Description
(MAX5070 / MAX5071) Current-Mode PWM Controllers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5071.pdf
(22 pages)
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MAX5071CAUA+
Manufacturer:
Maxim Integrated Products
Quantity:
135
www.DataSheet4U.com
The MAX5070/MAX5071 BiCMOS, high-performance,
current-mode PWM controllers have all the features
required for wide input voltage range isolated/nonisolated
power supplies. These controllers are used for low- and
high-power universal input voltage and telecom power
supplies.
The MAX5070/MAX5071 contain a fast comparator with
only 60ns typical delay from current sense to the output
for overcurrent protection. The MAX5070A/MAX5070B
have an integrated error amplifier with the output at
COMP. Soft-start is achieved by controlling the COMP
voltage rise using external components.
The frequency is adjustable from 20kHz to 1MHz with
an external resistor and capacitor. The timing capacitor
discharge current is trimmed allowing for programma-
ble dead time and maximum duty cycle for a given fre-
quency. The available saw-toothed waveform at R
can be used for slope compensation when needed.
The MAX5071A/MAX5071B include a bidirectional syn-
chronization circuit allowing for multiple controllers to
run at the same frequency to avoid beat frequencies.
Synchronization is accomplished by simply connecting
the SYNC pins of all devices together. When synchro-
nizing with other devices, the MAX5071A/MAX5071B
with the highest frequency synchronizes the other
devices. Alternatively, the MAX5071A/MAX5071B can
be synchronized to an external clock with an open-
drain output stage running at a higher frequency.
The MAX5071C provides a clock output pulse
(ADV_CLK) that leads the driver output (OUT) by
110ns. The advanced clock signal is used to drive the
secondary-side synchronous rectifiers.
The MAX5070/MAX5071 are available in 8-pin µMAX
and SO packages and operate over the automotive tem-
perature range of -40°C to +125°C.
19-3283; Rev 3; 10/06
µMAX is a registered trademark of Maxim Integrated Products, Inc.
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.
High-Performance, Single-Ended, Current-Mode
Universal Input AC/DC Power Supplies
Isolated Telecom Power Supplies
Isolated Power-Supply Modules
Networking Systems
Computer Systems/Servers
Industrial Power Conversion
Isolated Keep-Alive Circuits
________________________________________________________________ Maxim Integrated Products
General Description
Applications
T
C
®
T
♦ Pin-for-Pin Replacement for UC2842 (MAX5070A)
♦ 2A Drive Source and 1A Sink Capability
♦ Up to 1MHz Switching Frequency Operation
♦ Bidirectional Synchronization
♦ Advanced Output Drive for Secondary-Side
♦ Fast 60ns Cycle-by-Cycle Current Limit
♦ Trimmed Oscillator Capacitor Discharge Current
♦ Accurate 5% Start and Stop Voltage with 6V
♦ Low 32µA Startup Current
♦ 5V Regulator Output (VREF) with 20mA Capability
♦ Overtemperature Shutdown
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Specify lead-free by adding the + symbol at the end of the part
number when ordering.
MAX5070AASA
MAX5070AAUA
MAX5070BASA
MAX5070BAUA
Pin Configurations continued at end of data sheet.
and UC2844 (MAX5070B)
(MAX5071A/MAX5071B)
Synchronous Rectification (MAX5071C)
Sets Maximum Duty Cycle Accurately
Hysteresis
TOP VIEW
PART
COMP
R
PWM Controllers
T
/C
CS
FB
T
1
2
4
3
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
Ordering Information
µMAX/SO
MAX5070A
MAX5070B
Pin Configurations
6
8
7
5
VREF
V
OUT
GND
CC
PIN-PACKAGE
8 SO
8 µMAX
8 SO
8 µMAX
Features
1