Rainbow-electronics MAX8759 Manual do Utilizador descarregar pdf (Página 5)

MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V

BATT

= 12V, V

= V

DD,

= -40°C to +85°C.) (Note 1)

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

= V

BATT

4.5 5.5

BATT Input Voltage Range

= V

= open 5.5

28.0

BATT

= 28V 5

BATT Quiescent Current

MAX8759 is enabled

BATT

= V

= 5V 5

Output Voltage, Normal Operation

MAX8759 is enabled, 6V < V

BATT

< 28V,

0 < I

LOAD

< 10mA

5.2 5.5 V

Output Voltage, Shutdown MAX8759 is disabled, no load 3.5 5.5 V

rising (leaving lockout) 4.3

Undervoltage Lockout Threshold

falling (entering lockout) 3.7

GH1, GH2, GL1, GL2 On-Resistance,

Low State

TEST

= 100mA, V

= V

= 5V 6 Ω

GH1, GH2, GL1, GL2 On-Resistance,

High State

TEST

= 100mA, V

= V

= 5V 18 Ω

Resonant Frequency Range Guaranteed by design 30 80 kHz

Minimum On-Time 350 700 ns

Maximum Off-Time 40 80 µs

Current-Limit Threshold LX1 - PGND1, LX2 - PGND2 410 450 mV

Zero-Current Crossing Threshold LX1 - PGND1, LX2 - PGND2 3 13 mV

IFB1, IFB2 Input Voltage Range -3 +3 V

IFB1 Regulation Point 760 810 mV

IFB2 Regulation Point 775 825 mV

IFB1, IFB2 Input Bias Current -3V < V

IFB1,2

< 0

-230

µA

IFB1, IFB2 Lamp-Out Threshold 565 635 mV

IFB1, IFB2 to COMP Transconductance 0.5V < V

COMP

< 4V 60 160 µS

COMP Output Impedance 625MΩ

COMP Discharge Current During Overvoltage

or Overcurrent Fault

VFB

= 2.6V or V

ISEC

= 1.5V 500

2000

µA

COMP Discharge Current During DPWM

Off-Time

COMP

= 1.5V 90 130 µA

ISEC Input Voltage Range -3 +3 V

ISEC Overcurrent Threshold

1.18 1.26

VFB Input Voltage Range -4 +4 V

VFB Input Impedance 150 450 MΩ

VFB Overvoltage Threshold 2.1 2.5 V

VFB Undervoltage Threshold 210 280 mV

DPWM Oscillator Frequency R

FREQ

= 169kΩ 203 217 Hz

PWMO Output Impedance 20 60 kΩ

1 2 3 4 5 6 7 8 9 10 ... 30 31

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