Current-Mode PWM Controllers with

Programmable Switching Frequency

4

_______________________________________________________________________________________

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 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).

ELECTRICAL CHARACTERISTICS (continued)

Ω (MAX1500_A), R12

= 7.5k

BOOTSTRAP UVLO WAKE-UP LEVEL

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

21.4

21.5

21.6

21.7

21.8

21.3

-40

85

BOOTSTRAP UVLO SHUTDOWN LEVEL

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

9.5

9.7

9.9

10.1

10.3

9.3

-40

85

UVLO/EN WAKE-UP THRESHOLD

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

1.226

1.228

1.230

1.232

1.234

1.236

1.224

-40

85

UVLO/EN RISING

Typical Operating Characteristics

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

OSCILLATOR

Oscillator Frequency Range

50

2500

kHz

-10

+10

Oscillator Frequency Accuracy

-20

+20

%

25

625

NDRV Switching Frequency

(Note 4)

12.5

625.0

kHz

MAX1500_A

50

Maximum Duty Cycle

MAX1500_B

75

%