OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

IHSM4825RE271L

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
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 R
T
C
T
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
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
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
________________________________________________________________ Maxim Integrated Products 1
OUT
GNDR
T
/C
T
1
2
8
7
VREF
V
CC
FB
CS
COMP
µMAX/SO
TOP VIEW
3
4
6
5
MAX5070A
MAX5070B
Pin Configurations
Ordering Information
19-3283; Rev 3; 10/06
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.
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.
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
Pin Configurations continued at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +15V, R
T
= 10kΩ, C
T
= 3.3nF, V
VREF
= OPEN, C
VREF
= 0.1µF, COMP = OPEN, V
FB
= 2V, CS = GND, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
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.
V
CC
(Low-Impedance Source) to GND ..................-0.3V to +30V
V
CC
(I
CC
< 30mA).....................................................Self Limiting
OUT to GND ...............................................-0.3V to (V
CC
+ 0.3V)
OUT Current.............................................................±1A for 10µs
FB, SYNC, COMP, CS, R
T
/C
T
, VREF to GND ...........-0.3V to +6V
COMP Sink Current (MAX5070)..........................................10mA
Continuous Power Dissipation (T
A
= +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
PARAMETER SYMBOL CONDITIONS
MIN
TYP
UNITS
REFERENCE
Output Voltage V
VREF
T
A
= +25°C, I
VREF
= 1mA
4.950 5.000 5.050
V
Line Regulation ∆V
LINE
12V < V
CC
< 25V, I
VREF
= 1mA 0.4 4 mV
Load Regulation ∆V
LOAD
1mA < I
VREF
< 20mA 6 25 mV
Total Output Variation V
REFT
1mA < I
VREF
< 20mA, 12V < V
CC
< 25V 4.9 5.1 V
Reference Output-Noise Voltage
V
NOISE
10Hz < f < 10kHz, T
A
= +25°C 50 µV
Reference Output Short Circuit I
S_SC
V
VREF
=
0V -30
-100 -180
mA
OSCILLATOR
Initial Accuracy T
A
= +25°C 51 54 57 kHz
Voltage Stability 12V < V
CC
< 25V 0.2 0.5 %
Temp Stability -40°C < T
A
< +85°C 0.5 %
R
T
/C
T
Voltage Ramp (
P-P
)V
RAMP
1.7 V
R
T
/C
T
Voltage Ramp Valley
V
RAMP_VALLEY
1.1 V
Discharge Current I
DIS
V
RT/CT
= 2V, T
A
= +25°C 7.9 8.3 8.7 mA
Frequency Range f
OSC
20
1000
kHz
ERROR AMPLIFIER (MAX5070A/MAX5070B)
FB Input Voltage V
FB
FB shorted to COMP
2.465
2.5
2.535
V
FB Input Bias Current I
B(FB)
-0.01 -0.1
µA
Open-Loop Voltage Gain A
VOL
2V ≤ V
COMP
≤ 4V
100
dB
Unity-Gain Bandwidth f
GBW
1
MHz
Power-Supply Rejection Ratio PSRR 12V ≤ V
CC
≤ 25V (Note 2) 60 80 dB
COMP Sink Current I
SINK
V
FB
= 2.7V, V
COMP
= 1.1V 2 6 mA
COMP Source Current I
SOURCE
V
FB
= 2.3V, V
COMP
= 5V
-0.5 -1.2 -1.8
mA
COMP Output High Voltage V
COMPH
V
FB
= 2.3V, R
COMP
= 15kΩ to GND 5 5.8 V
COMP Output Low Voltage V
COMPL
V
FB
= 2.7V, R
COMP
= 15kΩ to VREF 0.1 0.5 V
CURRENT-SENSE AMPLIFIER
Gain A
CS
(Notes 3, 4)
2.85
3
3.26
V/V
MAX5070A/B (Note 3)
0.95
1
1.05
Maximum Current-Sense Signal V
CS_MAX
V
COMP
= 5V, MAX5071_
0.95
1
1.05
V
MAX5070/MAX5071
High-Performance, Single-Ended, Current-Mode
PWM Controllers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +15V, R
T
= 10kΩ, C
T
= 3.3nF, V
VREF
= OPEN, C
VREF
= 0.1µF, COMP = OPEN, V
FB
= 2V, CS = GND, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS
MIN TYP MAX
UNITS
Power-Supply Rejection Ratio PSRR 12V ≤ V
CC
≤ 25V 70 dB
Input Bias Current I
CS
V
COMP
= 0V -1
-2.5
µA
Delay From CS to OUT
t
CS_DELAY
50mV overdrive 60 ns
MOSFET DRIVER
OUT Low-Side On-Resistance
V
RDS_ONL
I
SINK
= 200mA 4.5 10 Ω
OUT High-Side On-Resistance
V
RDS_ONH
I
SOURCE
= 100mA 3.5 7 Ω
I
SOURCE
(Peak) I
SOURCE
C
OUT
= 10nF 2 A
I
SINK
(Peak) I
SINK
C
OUT
= 10nF 1 A
Rise Time t
r
C
OUT
= 1nF 15 ns
Fall Time t
f
C
OUT
= 1nF 22 ns
UNDERVOLTAGE LOCKOUT/STARTUP
Startup Voltage Threshold
V
CC_START
15.2
16
16.8
V
Minimum Operating Voltage After
Turn-On
V
CC_MIN
9.2 10
10.8
V
Undervoltage-Lockout Hysteresis
UVLO
HYST
6V
PWM
MAX5070A/MAX5071A
94.5
96
97.5
Maximum Duty Cycle D
MAX
MAX5070B/MAX5071B/MAX5071C 48
49.8
50
%
Minimum Duty Cycle D
MIN
0%
SUPPLY CURRENT
Startup Supply Current I
START
32 65 µA
Operating Supply Current I
CC
V
FB
= V
CS
= 0V 3 5 mA
Zener Bias Voltage at V
CC
V
Z
I
CC
= 25mA 24
26.5
V
THERMAL SHUTDOWN
Thermal Shutdown T
SHDN
+150
°C
Thermal-Shutdown Hysteresis T
HYST
4°C
SYNCHRONIZATION (MAX5071A/MAX5071B only) (Note 5)
SYNC Frequency Range f
SYNC
20
1000
kHz
SYNC Clock Input High
Threshold
V
SYNCINH
3.5 V
SYNC Clock Input Low Threshold
V
SYNCINL
0.8 V
SYNC Clock Input Minimum
Pulse Width
t
PW_SYNCIN
200
ns
SYNC Clock Output High Level V
SYNCOH
1mA external pulldown 4.0 4.7 V
SYNC Clock Output Low Level V
SYNCOL
R
SYNC
= 5kΩ 0 0.1 V
SYNC Leakage Current I
SYNC
V
SYNC
= 0V
0.01
0.1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

IHSM4825RE271L

Mfr. #:
Buy IHSM4825RE271L
Manufacturer:
Vishay / Dale
Description:
Fixed Inductors IHSM-4825 270 15% RC2
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet