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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5071 Datasheet

(MAX5070 / MAX5071) Current-Mode PWM Controllers

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MAX5071 pdf
19-3283; Rev 3; 10/06
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High-Performance, Single-Ended, Current-Mode
PWM Controllers
General Description
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 RTCT
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.
Applications
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
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
Pin-for-Pin Replacement for UC2842 (MAX5070A)
and UC2844 (MAX5070B)
2A Drive Source and 1A Sink Capability
Up to 1MHz Switching Frequency Operation
Bidirectional Synchronization
(MAX5071A/MAX5071B)
Advanced Output Drive for Secondary-Side
Synchronous Rectification (MAX5071C)
Fast 60ns Cycle-by-Cycle Current Limit
Trimmed Oscillator Capacitor Discharge Current
Sets Maximum Duty Cycle Accurately
Accurate 5% Start and Stop Voltage with 6V
Hysteresis
Low 32µA Startup Current
5V Regulator Output (VREF) with 20mA Capability
Overtemperature Shutdown
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5070AASA
-40°C to +125°C
8 SO
MAX5070AAUA
-40°C to +125°C
8 µMAX
MAX5070BASA
-40°C to +125°C
8 SO
MAX5070BAUA
-40°C to +125°C
8 µMAX
Specify lead-free by adding the + symbol at the end of the part
number when ordering.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
COMP 1
FB 2
CS 3
RT/CT 4
MAX5070A
MAX5070B
8 VREF
7 VCC
6 OUT
5 GND
µMAX/SO
Pin Configurations continued 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’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5071 Datasheet

(MAX5070 / MAX5071) Current-Mode PWM Controllers

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MAX5071 pdf
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High-Performance, Single-Ended, Current-Mode
PWM Controllers
ABSOLUTE MAXIMUM RATINGS
VCC (Low-Impedance Source) to GND ..................-0.3V to +30V
VCC (ICC < 30mA).....................................................Self Limiting
OUT to GND ...............................................-0.3V to (VCC + 0.3V)
OUT Current.............................................................±1A for 10µs
FB, SYNC, COMP, CS, RT/CT, VREF to GND ...........-0.3V to +6V
COMP Sink Current (MAX5070)..........................................10mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
8-Pin SO (derate 5.9mW/°C above +70°C)...............470.6mW
Operating Temperature Range (Automotive) ....-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +15V, RT = 10k, CT = 3.3nF, VVREF = OPEN, CVREF = 0.1µF, COMP = OPEN, VFB = 2V, CS = GND, TA = -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
REFERENCE
Output Voltage
VVREF
TA = +25°C, IVREF = 1mA
Line Regulation
VLINE 12V < VCC < 25V, IVREF = 1mA
Load Regulation
Total Output Variation
VLOAD
VREFT
1mA < IVREF < 20mA
1mA < IVREF < 20mA, 12V < VCC < 25V
Reference Output-Noise Voltage
Reference Output Short Circuit
VNOISE
IS_SC
10Hz < f < 10kHz, TA = +25°C
VVREF = 0V
OSCILLATOR
Initial Accuracy
TA = +25°C
Voltage Stability
Temp Stability
RT/CT Voltage Ramp (P-P)
VRAMP
12V < VCC < 25V
-40°C < TA < +85°C
RT/CT Voltage Ramp Valley
Discharge Current
VRAMP_VALLEY
IDIS VRT/CT = 2V, TA = +25°C
Frequency Range
fOSC
ERROR AMPLIFIER (MAX5070A/MAX5070B)
FB Input Voltage
FB Input Bias Current
VFB
IB(FB)
FB shorted to COMP
Open-Loop Voltage Gain
AVOL
2V VCOMP 4V
Unity-Gain Bandwidth
fGBW
Power-Supply Rejection Ratio
COMP Sink Current
PSRR
ISINK
12V VCC 25V (Note 2)
VFB = 2.7V, VCOMP = 1.1V
COMP Source Current
ISOURCE VFB = 2.3V, VCOMP = 5V
COMP Output High Voltage
VCOMPH VFB = 2.3V, RCOMP = 15kto GND
COMP Output Low Voltage
CURRENT-SENSE AMPLIFIER
VCOMPL VFB = 2.7V, RCOMP = 15kto VREF
Gain
ACS (Notes 3, 4)
Maximum Current-Sense Signal
VCS_MAX
MAX5070A/B (Note 3)
VCOMP = 5V, MAX5071_
MIN TYP MAX UNITS
4.950
4.9
-30
5.000
0.4
6
50
-100
5.050
4
25
5.1
-180
V
mV
mV
V
µV
mA
51 54 57 kHz
0.2 0.5
%
0.5 %
1.7 V
1.1 V
7.9 8.3 8.7 mA
20 1000 kHz
2.465
60
2
-0.5
5
2.5
-0.01
100
1
80
6
-1.2
5.8
0.1
2.535
-0.1
-1.8
0.5
V
µA
dB
MHz
dB
mA
mA
V
V
2.85 3 3.26 V/V
0.95 1 1.05
V
0.95 1 1.05
2 _______________________________________________________________________________________


Part Number MAX5071
Description (MAX5070 / MAX5071) Current-Mode PWM Controllers
Maker Maxim Integrated Products
Total Page 22 Pages
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