Rainbow-electronics MAX8742 Manual do Utilizador descarregar pdf (Página 4)

MAX8741/MAX8742

500kHz Multi-Output Power-Supply Controllers

with High Impedance in Shutdown

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, both PWMs on, SYNC = V

, V

load = 0, REF load = 0, SKIP = 0, T

= 0°C to +85°C, unless otherwise noted. Typical

values are at T

= +25°C.)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

FAULT DETECTION

Overvoltage Trip Threshold With respect to unloaded output voltage 4 7 10 %

Overvoltage Fault Propagation Delay

CSL_ driven 2% above overvoltage trip

threshold

1.5 µs

Output Undervoltage Threshold With respect to unloaded output voltage 60 70 80 %

Output Undervoltage-Lockout Time

From each SMPS enabled, with respect to

OSC

3300 4096 4700

Clks

Thermal-Shutdown Threshold Typical hysteresis = 10°C

+150

°C

RESET

RESET Trip Threshold

With respect to unloaded output voltage,

falling edge; typical hysteresis = 1%

-7

-5.5

-4 %

RESET Propagation Delay

Falling edge, CSL_ driven 2% below RESET

trip threshold

1.5 µs

RESET Delay Time With respect to f

OSC

27,000 32,000 37,000

Clks

INPUTS AND OUTPUTS

Feedback-Input Leakage Current FB3, FB5; SECFB = 2.6V 1 50 nA

Logic Input-Low Voltage

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

0.6 V

Logic Input-High Voltage

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC

2.4 V

Input Leakage Current

RUN/ON3, SKIP, TIME/ON5 (SEQ = REF),

SHDN, STEER, SYNC, SEQ; V

= 0V or 3.3V

±1µA

Logic Output-Low Voltage RESET, I

SINK

= 4mA 0.4 V

Logic Output-High Current RESET = 3.5V 1 mA

TIME/ON5 Input Trip Level SEQ = 0 or V

2.4 2.6 V

TIME/ON5 Source Current TIME/ON5 = 0, SEQ = 0 or V

2.5 3 3.5 µA

TIME/ON5 On-Resistance TIME/ON5; RUN/ON3 = 0, SEQ = 0 or V

15 80 Ω

Gate-Driver Sink/Source Current DL3, DH3, DL5, DH5; forced to 2V 1 A

SSOP package 1.5 7

Gate-Driver On-Resistance

High or low (Note 5)

QFN package 1.5 8

Ω

1 2 3 4 5 6 7 8 9 ... 32 33

MAX8741/MAX8742 1

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