Rainbow-electronics MAX5069 Manual de usuario descargar pdf (Pagina 4)

MAX5069

High-Frequency, Current-Mode PWM Controller

with Accurate Oscillator and Dual FET Drivers

4 _______________________________________________________________________________________

Note 1: The MAX5069 is 100% tested at T

= +25°C. All limits over temperature are guaranteed by design.

Note 2: The MAX5069A/B are intended for use in universal-input power supplies. The internal clamp circuit 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. The maximum current to V

(hence to clamp) when UVLO is low (device is in shutdown) must be external-

ly limited to 2mA. Clamp currents higher than 2mA may result in clamp voltages higher than 30V, thus exceeding the

absolute maximum rating for V

. For the MAX5069C/D, do not exceed the 24V maximum operating voltage of the device.

Note 3: Reference voltage (V

REF

) is measured with FB connected to COMP (see the Functional Diagram).

Note 4: The SYNC frequency must be at least 25% higher than the programmed oscillator frequency.

Note 5: The internal oscillator clock cycle.

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

NDRV_ Switching Frequency f

= 10

/ (2 x R

)25

1250

kHz

RT Voltage V

40kΩ < R

< 500kΩ 2.0 V

OSC

≤ 500kHz -2.5 +2.5

= +25°C

OSC

> 500kHz

-4 +4

OSC

≤ 500kHz -4.5 +4.5

Oscillator Accuracy

= -40°C to +125°C

OSC

> 500kHz

-6 +6

Maximum Duty Cycle D

MAX

DT connected to REG5

100

DEAD-TIME CONTROL (DT)

Dead Time t

= 24.9kΩ 60 ns

Dead-Time Disable Voltage

DT_DISABLE

REG5

0.5V

Dead-Time Regulation Voltage V

1.23

INTEGRATING FAULT PROTECTION (FLTINT)

FLTINT Source Current I

FLTINT

= 0V 60 µA

FLTINT Shutdown Threshold

FLTINT_SD

FLTINT

rising 2.8 V

FLTINT Restart Threshold

FLTINT_RS

FLTINT

falling 1.6 V

SLOPE COMPENSATION

Slope Compensation V

SLOPE

= 100pf, RT = 110kΩ 15

mV/µs

Slope-Compensation Range

SLOPER

090

mV/µs

Slope-Compensation Voltage

Range

SCOMP

0 2.7 V

ELECTRICAL CHARACTERISTICS (continued)

= +12V for the MAX5069C/D, V

= +23.6V for the MAX5069A/B at startup, then reduces to +12V, C

= C

REG5

= 0.1µF,

VCC

= 1µF, R

= 100kΩ, NDRV_ = floating, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at T

= +25°C.) (Note 1)

1 2 3 4 5 6 7 8 9 ... 18 19

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