Rainbow-electronics MAX1845 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX1845

Dual, High-Efficiency, Step-Down

Controller with Accurate Current Limit

6 _______________________________________________________________________________________

0.01 1010.1

300

350

400

200

250

100

150

MAX1845 toc01

LOAD CURRENT (A)

FREQUENCY (kHz)

FREQUENCY vs. LOAD CURRENT

OUT1, SKIP = V

OUT2, SKIP = V

OUT1, SKIP = GND

OUT2, SKIP = GND

100

150

200

250

300

350

400

4 8 12 16 20 21

MAX1845 toc02

INPUT VOLTAGE (V)

FREQUENCY (kHz)

FREQUENCY vs. INPUT VOLTAGE

(TON = FLOAT, SKIP = V

)

OUT1

OUT2

OUT1

= 8A

OUT2

= 4A

__________________________________________Typical Operating Characteristics

(Circuit of Figure 1, components from Table 1, V

= 15V, SKIP = GND, TON = unconnected, T

= +25°C, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V

= V

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

= -40°C to +85°C, unless otherwise noted.) (Note 1)

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

Note 2: When the inductor is in continuous conduction, the output voltage will have a DC regulation level higher than the error compara-

tor threshold by 50% of the output voltage ripple. In discontinuous conduction (SKIP = GND, light load), the output voltage will

have a DC regulation higher than the error-comparator threshold by approximately 1.5% due to slope compensation.

Note 3: On-time and off-time specifications are measured from 50% point to 50% point at DH_ with LX_ = GND, BST_ = 5V, and a

250pF capacitor connected from DH_ to LX_. Actual in-circuit times may differ due to MOSFET switching speeds.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

GND - V

, V

ILIM

_ = 0.5V 35 65

Current-Limit Threshold

(Adjustable)

GND - V

, V

ILIM

_ = 1V 80 120

Undervoltage Lockout

Threshold

Rising edge, hysteresis = 20mV, PWMs

disabled below this level

4.05

4.4 V

ON_, SKIP 2.4

Logic Input High Voltage V

UVP

0.4

ON_, SKIP 0.8

Logic Input Low Voltage V

UVP

0.05

TON (GND or V

)-33

Logic Input Current

ON_, SKIP, UVP -1 1

µA

1 2 3 4 5 6 7 8 9 10 11 ... 23 24

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