Rainbow-electronics MAX1817 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX1817

Compact, High-Efficiency, Dual-Output

Step-Up DC-DC Converter

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= V

ONLCD

= V

OUT

= +3.3V, FB = GND, T

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

PARAMETER CONDITIONS MIN MAX UNITS

FB Dual Mode Threshold 45 105 mV

Outp ut V ol tag e Ad j ustm ent Rang e 2.5 5.5 V

Maximum LX On-Time V

= 0.5V 2.4 7.5 µs

Zero Crossing Comparator

Threshold (V

- V

OUT

)

040mV

Zero Crossing Comparator

Backup Timer

= 0.5V 22 70 µs

LX On-Resistance V

OUT

= 3.3V, I

= 100mA 0.65 Ω

LX Current Limit 0.42 1.05 A

LX Leakage Current V

= GND, V

= 5.5V 1 µA

ON Input Low Voltage 1.8V < V

OUT

< 5.5V, V

= 0.5V 400 mV

ON Input High Voltage 1.8V < V

OUT

< 5.5V, V

= 0.5V 1.6 V

ON Input Bias Current 1µA

LCD OUTPUT

LXLCD Voltage 28 V

LXLCD On-Resistance V

OUT

= 3.3V, I

LXLCD

= 100mA 2 Ω

LXLCD Current Limit 0.25 0.7 A

LXLCD Leakage Current V

LXLCD

= 28V, V

ONLCD

= 0 1 µA

FBLCD Regulation Voltage 1.20 1.30 V

FBLCD Input Bias Current V

FBLCD

= 1.35V 70 nA

Maximum LXLCD On-Time 4 14 µs

FBLCD

≥ 1.2V 0.5 1.5

Minimum LXLCD Off-Time

FBLCD

≤ 0.7V 2.2 7.5

µs

ONLCD Input Low Voltage 2.5V < V

OUT

< 5.5V 400 mV

ONLCD Input High Voltage 2.5V < V

OUT

< 5.5V 1.6 V

ONLCD Input Bias Current 1µA

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

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Step-Up DC-DC Converter 1

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