ml4835 Microsemi Corporation, ml4835 Datasheet - Page 9

• Manufacturer Part Number: ml4835
• Description: Compact Fluorescent Electronic Dimming Ballast Controller
• Manufacturer: Microsemi Corporation

10
19
11
8
1.25/1.0V
4.75/1.25V
R
INTERRUPT
R
V
T2
X
CC
/C
X
LEA_ENB
Figure 9. Typical V
R
T2
+
0.625
–
R
+
–
SET
7.5V
the Rectified AC Line and Bootstrapped from an Auxiliary Winding.
CC
V
I
V
and I
V
CC
CC
TH
TL
0.34mA
V(OFF)
V(ON)
5.5mA
= 3.75V
= 1.25V
V CC Z
Figure 8. Oscillator Block Diagram and Timing
C
CLOCK
CC
R
T
T
NOTE 1: R
9
Waveforms when the ML4835 is Started with a Bleed Resistor from
R
C
T
/C
T
T
I
I
CHG
CHG
SET
t
SHOULD BE SELECTED SUCH THAT AFTER PREHEAT WITH LEA_ENB "HI",
DIS
MUST BE < 0.
IS A UNI-DIRECTIONAL SOURCE CURRENT ONLY.
5.5mA
I
CHG
3.75/1.25V
REF
20
+
–
t
CHG
DURING PREHEAT
AFTER PREHEAT
LEA_ENB = HI
LEA_ENB = LOW
I
I
I
CHG =
CHG =
CHG =
t
t
RSET
RSET
RSET
2.5V
5V
5V
–
– LEAO
8K±25%
8K±25%
7.5V
ML4835
9