Rainbow-electronics MAX1715 Manual do Utilizador descarregar pdf (Página 13)

MAX1715

Ultra-High Efficiency, Dual Step-Down

Controller for Notebook Computers

______________________________________________________________________________________ 13

REF

-6%

FROM

OUT

REF

FROM ZERO-CROSSING COMPARATOR

ERROR

AMP

TOFF

TON

REF

+12%

REF

-30%

FEEDBACK

MUX

(SEE FIGURE 9)

OVP/UVLO

LATCH

TO DL DRIVER

TO DH DRIVER

ON-TIME

COMPUTE

TON

1-SHOT

FROM ILIM

COMPARATOR

1-SHOT

TRIG

2V TO 28V

TRIG

FB_

OUT_

S2 TIMER

TON

V+

TO PGOOD

OR GATE

Figure 3. PWM Controller (one side only)

X = Don’t care

ON1

ON2 SKIP MODE COMMENTS

0 0 X SHUTDOWN Low-power shutdown state. DL = V

. Clears fault latches.

0 1 X OUT1 Disable Disable OUT1. DL1 = V

. Clears OUT1 fault latches.

1 0 X OUT2 Disable Disable OUT2. DL2 = V

. Clears OUT2 fault latches.

X X <-0.3V No Fault Disables the output overvoltage and undervoltage fault circuitry.

1 1 V

RUN (PWM)

Low Noise

Low-Noise operation with no automatic PWM/PFM switchover. Fixed-frequency PWM

action is forced regardless of load. Inductor current reverses at light load levels. I

draw <1.5mA (typ) plus gate-drive current.

Table 3. Operating Mode Truth Table

1 1 AGND

RUN

(PFM/PWM)

Normal operation with automatic PWM/PFM switchover for pulse-skipping at light loads.

<1.5mA (typ) plus gate drive current.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 24 25

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