Rainbow-electronics MAX1545 Manual de usuario descargar pdf (Pagina 5)

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, V+ = 15V, V

= V

SHDN

= V

TON

= V

SKIP

= V

CODE

= 5V, V

= V

CMP

= V

CMN

= V

CSP

= V

CSN

= 1.3V, OFS = SUS = GNDS = D0–D4 = GND; T

= 0°C to +85°C, unless otherwise specified. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GATE DRIVERS

DH_ Gate-Driver On-Resistance R

ON(DH)

BST_ - LX_ forced to 5V 1.0 4.5 Ω

High state (pullup) 1.0 4.5

DL_ Gate-Driver On-Resistance R

ON(DL)

Low start (pulldown) 0.4 2

Ω

DH_ Gate-Driver Source/Sink

Current

DH_ forced to 2.5V,

BST_ - LX_ forced to 5V

1.6 A

DL_ Gate-Driver Sink Current I

(

SINK

)

DL_ forced to 5V 4 A

DL_ Gate-Driver Source Current I

(

SOURCE

)

DL_ forced to 2.5V 1.6 A

DL_ rising 35

Dead Time t

DEAD

DH_ rising 26

VOLTAGE-POSITIONING AMPLIFIER

Input Offset Voltage V

-1 +1 mV

Input Bias Current I

BIAS

OAIN+, OAIN- 0.1 200 nA

Op Amp Disable Threshold V

OAIN-

- 1

0.4

Common-Mode Input Voltage

Range

Guaranteed by CMRR test 0 2.5 V

Common-Mode Rejection Ratio CMRR V

OAIN+

= V

OAIN-

= 0 to 2.5V 70 115 dB

Power-Supply Rejection Ratio PSRR V

= 4.5V to 5.5V 75 100 dB

Large-Signal Voltage Gain A

= 1kΩ to V

/2 80 112 dB

- V

FBH

77 300

Output Voltage Swing

OAIN+

- V

OAIN-

| ≥ 10mV,

= 1kΩ to V

FBL

47 200

Input Capacitance 11 pF

Gain-Bandwidth Product 3 MHz

Slew Rate 0.3 V/µs

Capacitive-Load Stability No sustained oscillations 400 pF

LOGIC AND I/O

SHDN Input High Voltage V

0.8 V

SHDN Input Low Voltage V

0.4 V

SHDN No-Fault Threshold V

SHDN

12 15 V

High 2.7

REF 1.2 2.3

Three-Level Input Logic Levels SUS, SKIP

Low 0.8

Logic Input Current SHDN, SUS, SKIP -1 +1 µA

D0–D4 Logic Input High Voltage 1.6 V

D0–D4 Logic Input Low Voltage 0.8 V

1 2 3 4 5 6 7 8 9 10 ... 42 43

MAX1519/MAX1545 1

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Rainbow-electronics MAX1545 Manual de usuario Pagina 5

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