Rainbow-electronics MAX5066 Manual do Utilizador descarregar pdf (Página 10)

MAX5066

Configurable, Single-/Dual-Output, Synchronous

Buck Controller for High-Current Applications

10 ______________________________________________________________________________________

An oscillator, with an externally programmable frequen-

cy generates two clock pulse trains and two ramps for

both PWM sections. The two clocks and the two ramps

are 180° out of phase with each other.

A linear regulator (REG) generates the 5V to supply the

device. This regulator has the output-current capability

necessary to provide for the MAX5066’s internal circuit-

ry and the power for the external MOSFET’s gate dri-

vers. A low-current linear regulator (REF) provides a

precise 3.3V reference output and is capable of driving

loads of up to 200µA. Internal UVLO circuitry ensures

that the MAX5066 starts up only when V

REG

and V

REF

are at the correct voltage levels to guarantee safe oper-

ation of the IC and of the power MOSFETs.

Finally, a thermal-shutdown feature protects the device

during thermal faults and shuts down the MAX5066

when the die temperature exceeds +160°C.

BST1

DH1

LX1

DL1

BST2

DH2

LX2

DL2

PGND

CSP2

CSN2

CSP1

CSN1

CA1

EAN1

REF

AGND

CA2

CPWM1

CPWM2

RT/CLKIN

CEA1

CEA2

12EAOUT1

MODE

EAOUT2

CLP2

CLP1

REG

1.225V

THERMAL

SHUTDOWN

MUX

EAN2

CEN

VEA1

DF1 AND

HICCUP

LOGIC

EXTERNAL FREQUENCY SYNC

0°

CONTROL

AND DRIVER

LOGIC 1

CONTROL

AND DRIVER

LOGIC 2

DF2 AND

HICCUP

LOGIC

OSCILLATOR

AND PHASE

SPLITTER

180°

P-P

RAMP

REG

= 5V

FOR INTERNAL

BIASING

UVLO

REF

= 3.3V

UV33

INTREF

= 0.61V

VEA2

CEN

P-P

RAMP

Figure 1. Block Diagram

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 21 22

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