Rainbow-electronics MAX685 Manual do Utilizador descarregar pdf (Página 3)

MAX685

Dual-Output (Positive and Negative),

DC-DC Converter for CCD and LCD

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= VP = 5V, T

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

= +25°C.)

ELECTRICAL CHARACTERISTICS

, VP = 5V, T

= -40°C to +85°C unless otherwise noted.) (Note 2)

Note 1: Negative output voltage can be larger magnitude for lower values of V

. The voltage between V

and V

OUT-

must not

exceed 14.5V.

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

= 5.5V (Note 1)

= VP

No load

= rising

= 4.5V, V

OUT+

≥ 14.25V, V

OUT-

≤ -7.125V,

Figure 3

SYNC = GND

SYNC = SEQ = SHDN = GND

CONDITIONS

V-9 -1.27Negative Output Voltage Range

VVP 24

V2.7 5.5Input Voltage Range

Positive Output Voltage Range

V1.205 1.275FBP Threshold Voltage

V2.35 2.65UVLO Threshold

mA10Maximum Output Current

µA500Idle Quiescent Current

µA10Shutdown Supply Current

UNITSMIN MAXPARAMETER

CONDITIONS

SYNC = V

SYNC = GND

kHz

320 400 480

Oscillator Frequency (internal)

175 220 265

kHz200 480Sync Frequency Range (external)

POK

= 2mA

FBN falling

FBP rising

V0.4POK Output Low Voltage

UNITSMIN TYP MAX

54 79 108

PARAMETER

FBN POK Threshold

V1.090 1.122 1.150FBP POK Threshold

POK

= 10V µA1POK Output Off Current

2.7V < V

≤ 5.5V

No load

V0.3 x V

Logic-Low Input

mV-20 40FBN Threshold Voltage

2.7V < V

≤ 5.5V V0.7 x V

Logic-High Input

FBP rising V1.090 1.150FBP POK Threshold

FBN falling mV54 108FBN POK Threshold

SYNC INPUT

POK COMPARATORS

No load V1.225 1.275VREF Output Voltage

SHUTDOWN

UNDERVOLTAGE LOCKOUT

FB INPUTS AND REFERENCE VOLTAGE

LOGIC INPUTS (SEQ, SHDN, SYNC)

POK COMPARATORS

1 2 3 4 5 6 7 8 ... 11 12

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