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MAX5021 Datasheet(PDF) 3 Page - Maxim Integrated Products

Part No. MAX5021
Description  Current-Mode PWM Controllers for Isolated Power Supplies
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
Logo MAXIM - Maxim Integrated Products

MAX5021 Datasheet(HTML) 3 Page - Maxim Integrated Products

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Current-Mode PWM Controllers for Isolated
Power Supplies
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +11V to +28V, VCS = 0, OPTO is unconnected, 10nF bypass capacitors at VIN and VCC, NDRV unconnected, TA = -40°C to
+85°C, unless otherwise noted. Typical values are at VIN = +12V, TA = +25°C, unless otherwise noted.) (Note 1)
Note 1: All devices are 100% tested at TA = +25°C. All limits over temperature are guaranteed by characterization.
Note 2: This minimum current after startup is a safeguard that prevents the VIN pin voltage from rising in the event
that OPTO and NDRV become unconnected.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OSCILLATOR
Switching Frequency
fSW
230
262
290
kHz
MAX5021
50
51
Maximum Duty Cycle
DMAX
MAX5022
75
76
%
OPTO INPUT
OPTO Pullup Voltage
VOPTO
OPTO sourcing 10µA
5.5
V
OPTO Pullup Resistance
ROPTO
4.5
6.2
7.9
k
Typical Operating Characteristics
(VIN = 15V, TA = +25°C, unless otherwise noted.)
23.9
24.0
24.1
24.2
24.3
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
TEMPERATURE (
°C)
-40
20
40
-20
0
60
80
VIN RISING
9.8
9.9
10.0
10.1
10.2
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
TEMPERATURE (
°C)
-40
20
40
-20
0
60
80
VIN FALLING
47
48
49
50
51
52
53
-40
-20
0
20
40
60
80
STARTUP CURRENT
vs. TEMPERATURE
TEMPERATURE (
°C)
VIN = 23.0V


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