MAX8555AEVKIT【PDF 3/10 页】EVAL KIT FOR MAX8555

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Sheet目录1228

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MAX8555A Evaluation Kit

kit also requires two 1.5V power supplies connected at

VIN1 and VIN2 for normal operation.

Note: Each circuit (top or bottom) can be evaluated inde-

pendently by not applying power to the other circuit.

Undervoltage Threshold

The UVP threshold for both circuits on the MAX8555A

EV kit is programmed to 0.75V by external resistors R3

VDD1 inputs low resets the latched fault on the upper

circuit. Cycling the TIMER2 or VDD2 inputs low resets

the latched fault on the bottom circuit.

The overvoltage threshold can be changed by replac-

ing feedback resistors R5, R13, and R14. Use the fol-

lowing equation to select new resistor values:

R 5 = R 6 ?

- 1 ?

and R4 for the top circuit, and resistors R11 and R12

for the bottom circuit. The MAX8555A controller in each

circuit holds the GATE pin low to isolate the input

? OVP

? 0 . 5 V

?

?

R 13 = R 14 = 2 × R 5

power supplies VIN1 and VIN2 from the active VOUT

power bus, if the voltage is below the programmed

UVP threshold. If the voltage at VIN1 or VIN2 drops

below this threshold, the respective MAX8555A con-

troller turns off the MOSFETs by discharging the GATE

pin and asserts a logic-low signal on the corresponding

fault output ( FAULT1 or FAULT2 ). The controller returns

to normal operation and clears the fault if the input volt-

age exceeds the undervoltage threshold. The undervolt-

age threshold can be reconfigured by replacing the

appropriate feedback resistors (R3/R4 or R11/R12). Use

the following equations to select new resistor values:

where OVP is the desired overvoltage threshold and R6

is set to 1k ? . Refer to the Setting the OVP Fault

Threshold section in the MAX8555A data sheet to

select new components values.

Remove resistor R5 and short resistor R6 to disable the

overvoltage-protection function.

Reverse Current

The MAX8555A controller detects reverse current dur-

ing normal operation by monitoring the voltage differ-

ence between VIN1 (or VIN2) and VOUT, using the total

R 3 = R 4 ?

- 1 ?

R 11 = R 12 ?

- 1 ?

? UVP

? 0 . 5 V

?

?

? UVP

? 0 . 5 V

?

?

on-resistance (R DS(ON) ) of both N-channel MOSFETs in

their respective circuits. The two MOSFETs used on

each circuit have a combined on-resistance of 8m ?

(typ). The MAX8555A controllers detect a reverse-cur-

where UVP is the desired undervoltage threshold and

resistors R4 and R12 are typically set between 10k ?

and 50k ? .

The UVP feature can be disabled by connecting the

UVP pin to the VL pin. This can be achieved by remov-

ing the feedback resistors R3/R4 or R11/R12 and

installing a 0 ? resistor at R17 or R18.

Overvoltage Threshold

The OVP signal threshold for both circuits on the

MAX8555A EV kit is programmed to 2V by external

resistors R5 and R6. The MAX8555A controller turns off

the MOSFETs of the respective circuit, asserts a logic-

low signal on the corresponding output fault, and latch-

es the output off when an overvoltage fault condition is

detected. An overvoltage fault condition is detected

only if the voltage at VOUT exceeds this threshold and

the forward-current condition is established. The for-

ward-current condition is defined when both MOSFETs

are on and the voltage drop between the input and the

system bus is greater than 0.01V (typ). A voltage drop

greater than 0.01V is achieved when 2.5A (typ) of cur-

rent is sourced from inputs VIN1 or VIN2 to VOUT (2.5A

x 8m ? of R DS(ON) > 0.01V). Cycling the TIMER1 or

rent fault condition when V OUT -VIN1 (or VIN2) > 0.02V

(typ) after a 4.1ms blanking period, when the gate drive

first turns on. Each circuit detects a reverse-current

fault condition if 2.5A (typ) (2.5A x 8m ? > 0.02V) is

sourced from VOUT to VIN1 (or VIN2). During a

reverse-current condition, the MAX8555A controller

turns off the MOSFETs, asserts a logic-low signal on the

fault output ( FAULT1 or FAULT2 ), and latches the out-

put off.

FAULT Conditions

The MAX8555A EV kit provides two output fault signals,

FAULT1 and FAULT2 , to monitor fault events at the two

circuits on the EV kit board. During an overvoltage,

undervoltage, or reverse-current fault condition, the

corresponding MAX8555A FAULT pin is pulled low and

the GATE pin is discharged to ground, turning off both

MOSFETs. The fault state does not latch during an

undervoltage condition. The MAX8555A latches off dur-

ing a reverse current or an overvoltage fault condition.

Cycling the TIMER1 or VDD1 inputs low resets the

latched fault on the top circuit. Cycling the TIMER2 or

VDD2 inputs low resets the latched fault on the bottom

circuit. See Table 1 for fault-mode descriptions.

_______________________________________________________________________________________

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