MAX15001 データシートの表示（PDF） - Maxim Integrated

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MAX15001

Current-Mode PWM Controllers with Programmable Switching Frequency

Maxim Integrated 

Current-Mode PWM Controllers with

Programmable Switching Frequency

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +12V (for MAX15000, bring VIN up to 23.6V for startup), 10nF bypass capacitors at IN and VCC, R12 = 15kΩ (MAX1500_A), R12

= 7.5kΩ (MAX1500_B), 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 +85°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

MAX1500_A, fSW = fOSC/2

MAX1500_B, fSW = fOSC/4

MAX1500_A

MAX1500_B

50

2500

kHz

-10

+10

%

-20

+20

25

625

kHz

12.5

625.0

50

%

75

Note 1: All devices are 100% tested at TA = +85°C. All limits over temperature are guaranteed by characterization.

Note 2: The MAX15000 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 MAX15001, 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 MAX1500_A is capable of operating up to 2500kHz. However, the NDRV switching frequency is limited

to operate up to 625kHz. Thus, the oscillator frequency for MAX1500_A 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

MAX15000 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

MAX15000 VIN FALLING

10.1

9.9

9.7

9.5

9.3

-40 -15

10

35

60

85

TEMPERATURE (°C)

UVLO/EN WAKE-UP THRESHOLD

vs. TEMPERATURE

1.236

UVLO/EN RISING

1.234

1.232

1.230

1.228

1.226

1.224

-40 -15

10

35

60

85

TEMPERATURE (°C)

4 _______________________________________________________________________________________

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