MAX17499 데이터 시트보기 (PDF) - Maxim Integrated
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MAX17499 Datasheet PDF : 18 Pages
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Current-Mode PWM Controllers with
Programmable Switching Frequency
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +12V (for MAX17500, bring VIN up to 23.6V for startup), 10nF bypass capacitors at IN and VCC, R12 = 15kΩ (MAX17499A/
MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ, C6 = 100nF (see the Typical Application Circuit), NDRV = open,
VUVLO/EN = +1.4V, VFB = +1.0V, COMP = open, VCS = 0V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA =
+25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
OSCILLATOR
Oscillator Frequency Range
Oscillator Frequency Accuracy
NDRV Switching Frequency
(Note 4)
Maximum Duty Cycle
fOSC
fSW
DMAX
fOSC = 200kHz to 800kHz
fOSC = 50kHz to 2500kHz
MAX17499A/MAX17500A, fSW = fOSC/2
MAX17499B/MAX17500B, fSW = fOSC/4
MAX17499A/MAX17500A
MAX17499B/MAX17500B
50
-10
-20
25
12.5
2500
kHz
+10
%
+20
625
kHz
625.0
50
%
75
Note 1: All devices are 100% tested at TA = +125°C. All limits over temperature are guaranteed by characterization.
Note 2: The MAX17500 is intended for use in universal input power supplies. The internal clamp circuit at IN is used to prevent the
bootstrap capacitor (C1 in Figure 1) from charging to a voltage beyond the absolute maximum rating of the device when
UVLO/EN is low (shutdown mode). Externally limit the maximum current to IN (hence to clamp) to 2mA maximum when
UVLO/EN is low. Clamp currents higher than 2mA may result in a clamp voltage higher than 30V, thus exceeding the
absolute maximum rating for IN. For the MAX17499, do not exceed the 24V maximum operating voltage of the device.
Note 3: VREF is measured with FB connected to COMP (see the Functional Diagram).
Note 4: The oscillator in the MAX17499A/MAX17500A is capable of operating up to 2500kHz. However, the NDRV switching fre-
quency is limited to operate up to 625kHz. Thus, the oscillator frequency for the MAX17499A/MAX17500A must be limited to
1250kHz (maximum).
Typical Operating Characteristics
(VUVLO/EN = +1.4V, VFB = +1V, COMP = open, VCS = 0V, TA = +25°C, unless otherwise noted.)
BOOTSTRAP UVLO WAKE-UP LEVEL
vs. TEMPERATURE
21.8
MAX17500 VIN RISING
21.7
21.6
21.5
21.4
21.3
-40 -15
10
35
60
85
TEMPERATURE (°C)
BOOTSTRAP UVLO SHUTDOWN LEVEL
vs. TEMPERATURE
10.3
MAX17500 VIN FALLING
10.1
9.9
9.7
9.5
UVLO/EN WAKE-UP THRESHOLD
vs. TEMPERATURE
1.236
UVLO/EN RISING
1.234
1.232
1.230
1.228
1.226
9.3
1.224
-40 -15
10
35
60
85
-40 -15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
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