ML4835 查看數據表（PDF） - Micro Linear Corporation

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ML4835

Compact Fluorescent Electronic Dimming Ballast Controller

Micro Linear Corporation 

ML4835

RT2

RT2

8

LEA_ENB

INTERRUPT

10

–

1.25/1.0V +

VCC

19

RX/CX

11

4.75/1.25V

0.625

RSET 7.5V

–

+

REF

20

RT

ICHG

RT/CT

9

CT

+

3.75/1.25V

–

5.5mA

DURING PREHEAT

ICHG =

2.5V

RSET

AFTER PREHEAT

LEA_ENB = HI

ICHG =

5V

RSET

–

7.5V

8K±25%

LEA_ENB = LOW

ICHG =

5V

RSET

–

LEAO

8K±25%

NOTE 1: RSET SHOULD BE SELECTED SUCH THAT AFTER PREHEAT WITH LEA_ENB "HI",

ICHG MUST BE < 0.

ICHG IS A UNI-DIRECTIONAL SOURCE CURRENT ONLY.

CLOCK

tDIS

VTH = 3.75V

tCHG

CT

VTL = 1.25V

Figure 8. Oscillator Block Diagram and Timing

VCC VCCZ

V(ON)

V(OFF)

ICC

t

5.5mA

0.34mA

t

Figure 9. Typical VCC and ICC Waveforms when the ML4835 is Started with a Bleed Resistor from

the Rectified AC Line and Bootstrapped from an Auxiliary Winding.

9

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