MAX1611CSE データシートの表示（PDF） - Maxim Integrated

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MAX1611CSE

Digitally Controlled CCFL Backlight Power Supplies

Maxim Integrated 

Digitally Controlled CCFL Backlight

Power Supplies

VIN

16

+ BATT

C9

12

VL

MAX1610

5

SS

MAX1611* BST 14

C4

15

LX

6

CC

C3

OTP 10

R5

C8

R6

4

SYNC

9

REF

8

MINDAC

11

CS

7

CSAV

13

GND

* DIGITAL INTERFACE NOT SHOWN

D3

R7

C7

D2

C6

L1

R3

R4

Figure 4. Typical Floating-Lamp Application Circuit

C2

CCFL

10

1

2

34

6

T1

5

D1

R2

C1

C5

Q1

Q2

R1

Table 1. Necessary CCFL Specifications

SPECIFICATION

CCFL Minimum Strike Voltage

(“Kick-Off Voltage”)

UNITS

VRMS

SYMBOL

VS

CCFL Typical Operating Voltage

(“Lamp Voltage”)

VRMS

VL

CCFL Maximum Operating

Current (“Lamp Current”)

CCFL Maximum Frequency

(“Lamp Frequency”)

DC Power Source Minimum

Input Voltage

mARMS

kHz

V

IL

fL

VMIN

DESCRIPTION

Although CCFLs typically operate at 550VRMS, a higher voltage

is required initially to light up the tube.

Once a CCFL has been struck, the voltage required to maintain

light output falls to approximately 550VRMS. Small tubes may

operate on as little as 250VRMS. The operating voltage of the

CCFL stays relatively constant, even as the tube’s brightness is

varied.

The maximum root-mean-square AC current through a CCFL is

almost always 5mARMS. No DC current is allowed through any

CCFL.

The maximum AC-lamp-current frequency.

The minimum DC input voltage to the MAX1610/MAX1611 circuit

determines the turns ratio required for the DC-AC conversion

transformer. Decreasing the minimum input voltage increases

the size of the transformer required for a given output power.

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