Rainbow-electronics MAX1545 Manual de usuario descargar pdf (Pagina 3)

MAX1519/MAX1545

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

_______________________________________________________________________________________ 3

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

TON = GND

(550kHz)

155 180 205

TON = REF

(300kHz)

320 355 390

TON = open

(200kHz)

475 525 575

On-Time (Note 3) t

V+ = 12V,

= V

CCI

= 1.2V

TON = V

(100kHz)

920 1000 1140

TON = GND 300 375

Minimum Off-Time (Note 3) t

OFF

(

MIN

)

TON = V

, open, or REF 400 480

BIAS AND REFERENCE

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point, OAIN- = FB,

OAIN+

= 1.3V

1.70 3.20 mA

Quiescent Supply Current (V

Measured at V

, FB forced above the

regulation point

<1 5 µA

Quiescent Battery Supply Current

(V+)

V+

Measured at V+ 25 40 µA

Shutdown Supply Current (V

) Measured at V

, SHDN = GND 4 10 µA

Shutdown Supply Current (V

) Measured at V

, SHDN = GND <1 5 µA

Shutdown Battery Supply Current

(V+)

Measured at V+, SHDN = GND,

= V

= 0 or 5V

<1 5 µA

Reference Voltage V

REF

= 4.5V to 5.5V, I

REF

= 0 1.990 2.000 2.010 V

Reference Load Regulation ∆V

REF

= -10µA to +100µA -10 +10 mV

FAULT PROTECTION

SKIP = V

, measured at FB with respect

to unloaded output voltage

13 16 19 %

Output Overvoltage Protection

Threshold (MAX1545 Only)

OVP

SKIP = REF or GND 2.00 V

Output Overvoltage Propagation

Delay (MAX1545 Only)

OVP

FB forced 2% above trip threshold 10 µs

Output Undervoltage Protection

Threshold

UVP

Measured at FB with respect to unloaded

output voltage

67 70 73 %

Output Undervoltage Propagation

Delay

UVP

FB forced 2% below trip threshold 10 µs

Lower threshold

(undervoltage)

-12 -10 -8

VROK Threshold

Measured at FB

with respect to

unloaded output

voltage

Upper threshold

(overvoltage)

SKIP = V

+8 +10 +12

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

MAX1519/MAX1545 1

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Rainbow-electronics MAX1545 Manual de usuario Pagina 3

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