Rainbow-electronics MAX1855 Manual do Utilizador descarregar pdf (Página 16)

MAX1716/MAX1854/MAX1855

High-Speed, Adjustable, Synchronous Step-Down

Controllers with Integrated Voltage Positioning

16 ______________________________________________________________________________________

Figure 2. Functional Diagram

REF

-10%

FROM

OUT

REF

7R R

ERROR

AMP

TOFF

TON

REF

+10%

CHIP

SUPPLY

SHDN

VPS

VGATE

NO OVERVOLTAGE PROTECTION ON THE MAX1854

D1 D2 D3 D4

ON-TIME

COMPUTE

TON

1-SHOT

TRIG

2V TO 28V

TRIG

REF

R-2R

DAC

REF

PGND

+5V

OUTPUT

ZERO CROSSING

CURRENT

LIMIT

BST

LIM

+5V

SKIP

TON

V+

MAX1716

MAX1854

MAX1855

OVP/UVP

DETECT

200k

TON SETTING

(kHz)

K-FACTOR

(µs)

APPROXIMATE

K-FACTOR ERROR (%)

MIN RECOMMENDED V

BATT

OUT

= 1.6V (V)

200 5 ±9 2.04

300 3.3 ±11 2.28

400 2.2 ±15 2.84

550 1.8 ±20 3.55

Table 3. Approximate K-Factor Errors

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 32 33

MAX1716/MAX1854/MAX1855 1

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