ml4831 Microsemi Corporation, ml4831 Datasheet - Page 9

• Manufacturer Part Number: ml4831
• Description: Electronic Ballast Controller
• Manufacturer: Microsemi Corporation

R(X)
DIMMING
LOCKOUT
R(X)/C(X)
C(X)
INHIBIT
Figure 7. Lamp Preheat and Interrupt Timers
HEAT
INT
R(X)/C(X)
6.8
3.4
1.2
.65
7.5
10
0
9
INT
6.8
V
REF
+
–
R(SET)
0.625
1.2/3.4
1.2/6.8
+
–
+
–
Figure 8. Lamp Starting and Restart Timing
R
S
Q
HEAT
DIMMING
LOCKOUT
INHIBIT
LFB OUT is ignored by the oscillator until C(X) reaches
6.8V threshold. The lamps are therefore driven to full
power and then dimmed. The C(X) pin is clamped to
about 7.5V.
A summary of the operating frequencies in the various
operating modes is shown below.
Operating Mode
Dimming
Dimming
Lock-out
Preheat
Control
Operating Frequency
[F(MAX) to F(MIN)]
F(MIN) to F(MAX)
F(MIN)
2
ML4831
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