Rainbow-electronics MAX5069 Manual do Utilizador descarregar pdf (Página 3)

MAX5069

High-Frequency, Current-Mode PWM Controller

with Accurate Oscillator and Dual FET Drivers

_______________________________________________________________________________________ 3

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX

UNITS

CS Input Bias Current I

B_CL

= 0V 0

µA

CS Blanking Time

CS_BLANK

Propagation Delay from

Comparator Input to NDRV_

PD_CL

50mV overdrive

IN CLAMP VOLTAGE

IN Clamp Voltage

IN_CLAMP

IN sinking 2mA (Note 2)

24.0 26.0 29.0

ERROR AMPLIFIER (FB, COMP)

Voltage Gain A

COMP

= 100kΩ to AGND

Unity-Gain Bandwidth BW

COMP

= 100kΩ to AGND,

LOAD

= 100pF to AGND

MHz

Phase Margin PM

COMP

= 100kΩ to AGND,

LOAD

= 100pF to AGND

D eg r ees

FB Input Offset Voltage V

OS_FB

3mV

High

2.6 3.8

COMP Clamp Voltage V

COMP

Low

0.4 1.1

Error-Amplifier Output Current I

COMP

Sinking or sourcing

0.5

+25°C ≤ T

≤ +125°C (Note 3)

1.215 1.230 1.245

Reference Voltage V

REF

-40°C ≤ T

≤ +125°C (Note 3)

1.205 1.230 1.242

Input Bias Current I

B_EA

100 300

COMP Short-Circuit Current

COMP_SC

THERMAL SHUTDOWN

Thermal-Shutdown Temperature

+170

°C

Thermal Hysteresis T

HYST

°C

OSCILLATOR SYNC INPUT (MAX5069A/D only)

SYNC High-Level Voltage

IH_SYNC

2.4

SYNC Low-Level Voltage

IL_SYNC

0.4

SYNC Input Bias Current

B_SYNC

Maximum SYNC Frequency f

SYNC

OSC

= 2.5MHz (Note 4)

3.125

MHz

SYNC High-Level Pulse Width

SYNC_HI

SYNC Low-Level Pulse Width

SYNC_LO

DIGITAL SOFT-START

Soft-Start Duration t

(Note 5)

2047

Cycles

Reference-Voltage Step V

STEP

9.7

Reference-Voltage Steps During

Soft-Start

127

Steps

OSCILLATOR

Oscillator Frequency Range f

OSC

= (10

/ R

)

50 2500

kHz

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 ... 18 19

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