Rainbow-electronics MAX1791 Bedienungsanleitung PDF herunterladen (Seite 11)

MAX1762/MAX1791

High-Efficiency, 10-Pin µMAX, Step-Down

Controllers for Notebooks

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VP Input and VL Logic Supply

An internal linear regulator supplied by VP produces

the +4.65V supply (VL) that powers the PWM controller,

logic, reference, and other blocks within the

MAX1762/MAX1791. This +4.65V low-dropout linear

regulator can supply up to 25mA for external loads.

Bypass VL to GND with at least a 1µF ceramic capaci-

tor. V

can range between 5V and 20V. VL is turned

off when the device is in shutdown and drops by

approximately 500mV during a fault condition, such as

when the output is short circuited to ground, and recov-

ers when SHDN is cycled or power is reset. If VL is not

driven externally, then V

should be at least 5V to

ensure operation. If V

is running from a 5V (±10%)

supply, V

should be externally connected to VL.

Table 2. Component Manufacturers

MANUFACTURER USA PHONE WEBSITE INFO

Coiltronics 561-241-7876 www.coiltronics.com

Fairchild Semiconductor 408-822-2181 www.fairchildsemi.com

Sanyo 619-661-6835 www.secc.co.jp

USA 847-956-0666

Sumida

Japan 81-3-3607-5111

www.sumida.com

Taiyo Yuden 408-573-4150 www.t-yuden.com

Figure 5. Functional Block Diagram

OUT

GND

DRIVER

OUT

DRIVER

TON

1-SHOT

TRIG

ON-TIME

COMPUTE

ON/OFF

CONTROL

REF

TIMER

VOS

-100mV

ILIM

LINEAR

REG

FEEDBACK

MUX

(FIGURE 9)

1-SHOT

OFF

TRIG

REF

OUT

REF

-30%

OUT

UVP

LATCH

MAX1762

MAX1791

SHDN

10Ω

1µF

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 19 20

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