MAX5021 查看數據表（PDF） - Maxim Integrated
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MAX5021 Datasheet PDF : 11 Pages
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Current-Mode PWM Controllers for Isolated
Power Supplies
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)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
OSCILLATOR
Switching Frequency
Maximum Duty Cycle
OPTO INPUT
fSW
DMAX
MAX5021
MAX5022
230
262
290
kHz
50
51
%
75
76
OPTO Pullup Voltage
OPTO Pullup Resistance
VOPTO OPTO sourcing 10µA
ROPTO
5.5
V
4.5
6.2
7.9
kΩ
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.
(VIN = 15V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
24.3
VIN RISING
24.2
24.1
24.0
23.9
-40 -20
0 20 40 60 80
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT
vs. TEMPERATURE
10.2
VIN FALLING
10.1
10.0
9.9
9.8
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
STARTUP CURRENT
vs. TEMPERATURE
53
52
VIN = 23.0V
51
50
49
48
47
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
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