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MAX5021EUA+T

P1-P3P4-P6P7-P9P10-P11
General Description
The MAX5021/MAX5022 current-mode PWM controllers
contain all the control circuitry required for the design
of wide input voltage range isolated power supplies.
These devices are well suited for use in universal input
(85VAC to 265VAC) off-line or telecom (-36VDC to
-72VDC) power supplies.
An undervoltage lockout (UVLO) circuit with large hys-
teresis coupled with low startup and operating current
reduce power dissipation in the startup resistor and
allow use of ceramic bypass capacitors. The 262kHz
switching frequency is internally trimmed to ±12%
accuracy; this allows the optimization of the magnetic
and filter components resulting in compact, cost-effec-
tive power supplies. The MAX5021 with 50% maximum
duty cycle and MAX5022 with 75% maximum duty
cycle are recommended for forward converters and fly-
back converters, respectively. The MAX5021/MAX5022
are available in 6-pin SOT23, 8-pin µMAX, and 8-pin
DIP packages and are rated for operation over the
-40°C to +85°C temperature range.
Applications
Universal Off-Line Power Supplies
Standby Power Supplies
Isolated Power Supplies
Isolated Telecom Power Supplies
Mobile Phone Chargers
Features
♦ Available in a Tiny 6-Pin SOT23 Package
♦ 50µA Typical Startup Current
♦ 1.2mA Typical Operating Current
♦ Large UVLO Hysteresis of 14V
♦ Fixed Switching Frequency of 262kHz ±12%
♦ 50% Maximum Duty Cycle Limit (MAX5021)
♦ 75% Maximum Duty Cycle Limit (MAX5022)
♦ 60ns Cycle-by-Cycle Current-Limit Response
Time
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
________________________________________________________________ Maxim Integrated Products 1
GND
V
CC
NDRV
16OPTO
5 V
IN
CS
MAX5021
MAX5022
SOT23
TOP VIEW
2
34
NDRV
N.C.N.C.
1
2
8
7
CS
GNDV
IN
V
CC
OPTO
PDIP/µMAX
3
4
6
5
MAX5021
MAX5022
Pin Configuration
Ordering Information
MAX5021
MAX5022
V
OUT
V
SUPPLY
OPTO NDRV
CS
V
CC
V
IN
GND
Typical Operating Circuit
19-2066; Rev 1; 9/01
EVALUATION KIT AVAILABLE
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.
PART
MAX
DUTY
CYCLE
TEMP.
RANGE
PIN-
PACKAGE
TOP
MARK
MAX5021EUT 50% -40°C to +85°C 6 SOT23-6 AASQ
MAX5021EUA 50% -40°C to +85°C 8 µMAX —
MAX5021EPA 50% -40°C to +85°C 8 PDIP —
MAX5022EUT 75% -40°C to +85°C 6 SOT23-6 AASR
MAX5022EUA 75% -40°C to +85°C 8 µMAX —
MAX5022EPA 75% -40°C to +85°C 8 PDIP —
WARNING: The MAX5021/MAX5022 are designed to work
with high voltages. Exercise caution!
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +11V to +28V, V
CS
= 0, OPTO is unconnected, 10nF bypass capacitors at V
IN
and V
CC
, NDRV unconnected, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at V
IN
= +12V, T
A
= +25°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
IN
to GND .............................................................-0.3V to +30V
V
CC
to GND............................................................-0.3V to +13V
NDRV to GND.............................................-0.3V to (V
CC
+ 0.3V)
CS, OPTO to GND ....................................................-0.3V to +6V
NDRV Short-Circuit to GND........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
8-Pin PDIP (derate 9.1mW/°C above +70°C)................727mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering 10s) ..................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
UNDERVOLTAGE LOCKOUT/STARTUP
Undervoltage Lockout Wakeup
Level
V
UVR
V
IN
rising 22 24 26 V
Undervoltage Lockout Shutdown
Level
V
UVF
V
IN
falling 9.3 10 10.9 V
V
IN
Supply Current at Startup I
START
V
IN
= +22V 50 85 µA
V
IN
Range V
IN
11 28 V
T
UVR
V
IN
steps up from +9V to +26V 5
Undervoltage Lockout
Propagation Delay
T
UVF
V
IN
steps down from +26V to +9V 1
µs
INTERNAL SUPPLY
V
CC
Regulator Set Point V
CCSP
V
IN
= +11V to +28V, sourcing 1µA to 5mA
from V
CC
7.0 10.5 V
V
IN
= +28V, OPTO connected to GND 0.9 2.43
V
IN
Supply Current after Startup I
IN
V
IN
= +28V, OPTO unconnected (Note 2) 0.4
mA
GATE DRIVER
R
ON
(
LOW
)
Measured at NDRV sinking 5mA 10 20
Driver Output Impedance
R
ON
(
HIGH
)
Measured at NDRV sourcing 5mA 20 40
Ω
Driver Peak Sink Current I
SINK
250 mA
Driver Peak Source Current I
SOURCE
150 mA
PWM COMPARATOR
Comparator Offset Voltage VO
PWM
V
OPTO
- V
CS
600 750 900 mV
CS Input Bias Current I
CS
-2 +2 µA
Propagation Delay from
Comparator Input to NDRV
T
PWM
25mV overdrive 60 ns
Minimum On-Time T
ON
(
MIN
)
150 ns
CURRENT-LIMIT COMPARATOR
Current-Limit Trip Threshold V
CS
540 600 660 mV
Current-Limit Propagation Delay
from Comparator Input to NDRV
T
CL
25mV overdrive 60 ns
MAX5021/MAX5022
Current-Mode PWM Controllers for Isolated
Power Supplies
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +11V to +28V, V
CS
= 0, OPTO is unconnected, 10nF bypass capacitors at V
IN
and V
CC
, NDRV unconnected, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at V
IN
= +12V, T
A
= +25°C, unless otherwise noted.) (Note 1)
Note 1: All devices are 100% tested at T
A
= +25°C. All limits over temperature are guaranteed by characterization.
Note 2: This minimum current after startup is a safeguard that prevents the V
IN
pin voltage from rising in the event
that OPTO and NDRV become unconnected.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OSCILLATOR
Switching Frequency f
SW
230 262 290 kHz
MAX5021 50 51
Maximum Duty Cycle D
MAX
MAX5022 75 76
%
OPTO INPUT
OPTO Pullup Voltage V
OPTO
OPTO sourcing 10µA 5.5 V
OPTO Pullup Resistance R
OPTO
4.5 6.2 7.9 kΩ
Typical Operating Characteristics
(V
IN
= 15V, T
A
= +25°C, unless otherwise noted.)
23.9
24.0
24.1
24.2
24.3
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX5021/22 toc01
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT (V)
-40 20 40-20 0 60 80
V
IN
RISING
9.8
9.9
10.0
10.1
10.2
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
MAX5021/22 toc02
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT (V)
-40 20 40-20 0 60 80
V
IN
FALLING
47
48
49
50
51
52
53
-40 -20 0 20 40 60 80
STARTUP CURRENT
vs. TEMPERATURE
MAX5021/22 toc03
TEMPERATURE (°C)
STARTUP CURRENT (µA)
V
IN
= 23.0V
P1-P3P4-P6P7-P9P10-P11

MAX5021EUA+T

Mfr. #:
Buy MAX5021EUA+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers for Isolated Power Supplies
Lifecycle:
New from this manufacturer.
Delivery:
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