Rainbow-electronics MAX1845 Manual de usuario descargar pdf (Pagina 3)

MAX1845

Dual, High-Efficiency, Step-Down

Controller with Accurate Current Limit

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

= V

= 5V, SKIP = GND, V+ = 15V, T

= 0°C to +85°C, typical values are at +25°C, unless otherwise

noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TON = GND 160 182

204

TON = REF 205 234

263

TON = float 301 336

371

On-Time, Side 2 (Note 3) t

ON2

V+ = 24V,

OUT2

= 2V

TON = V

432 483

534

TON = GND 125 135

145

TON = REF 125 135

145

TON = float 125 135

145

On-Time Tracking (Note 3)

On-time 2 with

respect to on-

time 1

TON = V

125 135

145

Minimum Off-Time (Note 3) t

OFF

400

500

Quiescent Supply Current (V

FB_ forced above the regulation point

1100 1500

µA

Quiescent Supply Current (V

FB_ forced above the regulation point <1 5 µA

Quiescent Supply Current (V+) I+ Measured at V+ 25 70 µA

ON1 = ON2 = GND, OVP = V

or GND <1 5

Shutdown Supply Current (V

)

ON1 = ON2 = GND, V

OVP

= 1.8V 1 5

µA

Shutdown Supply Current (V

) ON1 = ON2 = GND <1 5 µA

Shutdown Supply Current (V+)

ON1 = ON2 = GND, measured at V+,

= GND or 5V

<1 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, no external REF load

1.98

2.02

Reference Load Regulation I

REF

= 0 to 50µA

0.01

REF Sink Current REF in regulation 10 µA

REF Fault Lockout Voltage Falling edge, hysteresis = 40mV 1.6 V

Overvoltage Trip Threshold

(Fixed-Threshold Mode)

OVP = GND, with respect to error-

comparator trip threshold

112 114

117

1V < V

OVP

< 1.8V, external feedback,

measured at FB_ with respect to V

OVP

-28 0 28 mV

Overvoltage Comparator Offset

(Adjustable-Threshold Mode)

1V < V

OVP

< 1.8V, internal feedback,

measured at OUT_ with respect to OUT_

regulation point

-3.5

+3.5

OVP Input Leakage Current 1V < V

OVP

< 1.8V

-100

100

Overvoltage Fault Propagation

Delay

FB_ forced 2% above trip threshold 1.5 µs

Output Undervoltage Threshold

UVP = V

, with respect to error-comparator

trip threshold

65 70 75 %

Output Undervoltage Protection

Blanking Time

From ON_ signal going high 10 30 ms

Current-Limit Threshold (Fixed) GND - V

, ILIM_ = V

40 50 60 mV

1 2 3 4 5 6 7 8 ... 23 24

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Rainbow-electronics MAX1845 Manual de usuario Pagina 3

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