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MAX5019 Datasheet(PDF) 3 Page - Maxim Integrated Products

Part No. MAX5019
Description  Current-Mode PWM Controllers with Integrated Startup Circuit
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
Logo MAXIM - Maxim Integrated Products

MAX5019 Datasheet(HTML) 3 Page - Maxim Integrated Products

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Current-Mode PWM Controllers with Integrated
Startup Circuit
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 13V, a 10µF capacitor connects VCC to GND, VCS = 0, V+ = 48V, 0.1µF capacitor connected from SS_SHDN to GND, NDRV
= open circuit, VFB = 3V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SLOPE COMPENSATION
Slope Compensation
(MAX5019 only)
VSCOMP
26
mV/
µs
THERMAL SHUTDOWN
Thermal Shutdown Temperature
150
°C
Thermal Hysteresis
25
°C
CURRENT LIMIT
CS Threshold Voltage
VILIM
FB = GND
419
465
510
mV
CS Input Bias Current
0
≤ VCS ≤ 2V, FB = GND
-1
1
µA
Current Limit Comparator
Propagation Delay
50mV overdrive on CS, FB = GND
180
ns
CS Blanking Time
FB = GND, only PWM comparator is blanked
70
ns
OSCILLATOR
Clock Frequency Range
FB = GND
247
275
302
kHz
MAX5019, FB = GND
75
85
Max Duty Cycle
MAX5020, FB = GND
44
50
%
SOFT-START
SS Source Current
ISSO
VSS_SHDN = 0
2.0
4.5
6.5
µA
SS Sink Current
1.0
mA
Steady State Reference Voltage
at SS_
SHDN
VSS_SHDN
No external load
2.331
2.420
2.500
V
VSS_SHDN falling
0.25
0.37
0.41
Shutdown Threshold
VSS_SHDN rising
0.53
0.59
0.65
V
Typical Operating Characteristics
(V+ = 48V, VDD = 13V, CS = GND, NRDV is open circuit, TA = +25°C, unless otherwise noted.)
0.999
1.000
1.001
1.002
1.003
-40
0
-20
20
40
60
80
VSS_SHDN vs. TEMPERATURE
(AT THE END OF SOFT-START)
TEMPERATURE (
°C)
VFB = 4V
273
274
276
275
277
278
-40
0
-20
20
40
60
80
NDRV FREQUENCY
vs. TEMPERATURE
TEMPERATURE (
°C)
FB = GND
80.4
80.6
80.5
80.8
80.7
80.9
81.0
-40
20
40
-20
0
60
80
MAX5019
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
TEMPERATURE (
°C)
FB = GND


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