Rainbow-electronics MAX1855 Manual de usuario descargar pdf (Pagina 3)

MAX1716/MAX1854/MAX1855

High-Speed, Adjustable, Synchronous Step-Down

Controllers with Integrated Voltage Positioning

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = +15V, V

= V

= 5V, SKIP = V

, VPS = PGND, T

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

values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

BIAS AND REFERENCE

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

700 950 µA

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

<1 5 µA

Quiescent Supply Current (V+) I+ 25 40 µA

Shutdown Supply Current (V

) SHDN = GND <1 5 µA

Shutdown Supply Current (V

) SHDN = GND <1 5 µA

Shutdown Supply Current (V+) SHDN = GND, V

= V

= 0 or 5V <1 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, no external REF load 1.98 2 2.02 V

Reference Load Regulation I

REF

= 0 to 50µA 0.01 V

REF Sink Current I

REF

REF in regulation 10 µA

REF Fault Lockout Voltage Falling edge 1.6 V

FAULT PROTECTION

MAX1716 1.8 1.9 2.0

Output Overvoltage Fault

Threshold (Note 5)

Measured at FB

MAX1855 1.97 2.0 2.03

Output Overvoltage Fault

Propagation Delay (Note 5)

FB forced to 2% above trip threshold

(MAX1716/MAX1855 only)

1.5 µs

Output Undervoltage Fault

Threshold (Foldback)

35 40 45 %

Output Undervoltage Fault

Propagation Delay

FB forced to 2% below trip threshold 10 µs

Output Undervoltage Fault

Blanking Time (Foldback)

From SHDN signal going high 10 30 ms

Current-Limit Threshold

(Positive, Default)

ITH

PGND

- V

, ILIM = V

110 120 130 mV

ILIM

= 0.5V 40 50 60

Current-Limit Threshold

(Positive, Adjustable)

ITH

PGND

- V

ILIM

= 2V (REF) 170 200 230

Negative Current-Limit

Threshold

PGND

- V

-1.2 ×

ITH

Zero-Crossing Current-Limit

Threshold

PGND

- V

3mV

Thermal Shutdown Threshold Hysteresis = 10°C 150 °C

Undervoltage Lockout

Threshold

Rising edge, hysteresis = 20mV, switching

disabled below this level

4.0 4.45 V

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

MAX1716/MAX1854/MAX1855 1

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Rainbow-electronics MAX1855 Manual de usuario Pagina 3

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