ml4836 Microsemi Corporation, ml4836 Datasheet - Page 5

• Manufacturer Part Number: ml4836
• Description: Compact Fluorescent Electronic Dimming Ballast Controller
• Manufacturer: Microsemi Corporation

FUNCTIONAL DESCRIPTION
The ML4836 consists of flexible ballast control section.
Start-up and lamp-out retry timing are controlled by the
selection of external timing components, allowing for
control of a wide variety of different lamp types. The
ballast section controls the lamp power using frequency
modulation (FM) with additional programmability
provided to adjust the VCO frequency range. This allows
for the IC to be used with a variety of different output
networks. Figure 1 depicts a detailed block diagram of
ML4836.
The ML4836 provides several safety features. See the
corresponding sections for more details:
14
10
1
8
4
REF
V CC
AGND
R X /C X
R SET
14V
–
+
REF
UVLO
6.75V
+
–
REF_OK
Figure 1. Detailed Block Diagram
THERMAL SHUTDOWN
4.65V/
1.75V
–
+
V
Q
Q
Q
Q
Q
Q
TO
+
–
I
PREHEAT
140ºC/100ºC
TEMP
• End-of-lamp life detection to detect EOL and shut-off
• Thermal shutdown for temperature sensing extremes;
• Relamping starting with anti-flash for programmable
R
S
R
S
T
lamps; See End Of Life Section.
See IC Bias, Under-Voltage Lockout and Thermal
Shutdown Section.
restart for lamp out conditions while minimizing
“flashing” when powering from full power to dimming
levels; See Starting, Re-Start, Preheat and Interrupt
Section
OSCILLATOR
CLK
V
TO
I
COMP
+
–
+
–
+
–
R X /C X
6.65V/1.25V
1.05V
+
1.20V/1V
–
ML4836
INTERRUPT
LAMP FB
2.5V
PWDET
OUT A
OUT B
PGND
R T /C T
LEAO
RT 2
13
12
11
9
7
5
6
3
2
5