Rainbow-electronics MAX15001 Manual do Utilizador descarregar pdf (Página 3)

MAX15000/MAX15001

Current-Mode PWM Controllers with

Programmable Switching Frequency

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= +12V (for MAX15000, bring V

up to 23.6V for startup), 10nF bypass capacitors at IN and V

, R12 = 15kΩ (MAX1500_A), R12

= 7.5kΩ (MAX1500_B), R15 = 1kΩ, C6 = 100nF (see the Typical Application Circuit), NDRV = open, V

UVLO/EN

= +1.4V, V

= +1.0V,

COMP = open, V

= 0V, T

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS MIN TYP MAX

UNITS

GATE DRIVER

(

LOW

)

Measured at NDRV sinking 100mA 2 4

Driver Output Impedance

(

HIGH

)

Measured at NDRV sourcing 20mA 4 10

Ω

Driver Peak Sink Current 1A

Driver Peak Source Current 0.65 A

PWM COMPARATOR

Comparator Offset Voltage V

PWM

COMP

- V

1.24 1.38 1.54 V

CS Input Bias Current I

= 0V -4 +4 µA

Comparator Propagation Delay t

PWM

Change in V

= 0.1V 60 ns

CURRENT-LIMIT COMPARATOR

Current-Limit Trip Threshold V

900

1000

1100 mV

CS Input Bias Current I

= 0V -4 +4 µA

Propagation Delay From

Comparator Input to NDRV

PDCS

100mV overdrive 60 ns

IN CLAMP VOLTAGE

IN Clamp Voltage V

INC

2mA sink current (Note 2) 24.1 26.1 29.0 V

ERROR AMPLIFIER

Voltage Gain R

LOAD

= 100kΩ 80 dB

Unity-Gain Bandwidth R

LOAD

= 100kΩ, C

LOAD

= 200pF 2

MHz

Phase Margin R

LOAD

= 100kΩ, C

LOAD

= 200pF 65

degrees

FB Input Offset Voltage ±1 mV

COMP High Voltage I

COMP

= 0 2.8

COMP Low Voltage I

COMP

= 0 1.1

Source Current 0.5 mA

Sink Current 0.5 mA

Reference Voltage V

REF

(Note 3)

1.230

Reference Voltage Accuracy -1.5 +1.5 %

FB Input Bias Current -50 +50 nA

COMP Short-Circuit Current 8mA

DIGITAL SOFT-START

1984

NDRV

cycles

Soft-Start Duration t

= 350kHz 5.6 ms

Reference Voltage Steps During

Soft-Start

steps

Reference Voltage Step

39.67

1 2 3 4 5 6 7 8 ... 17 18

MAX15000/MAX15001 1

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