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ML4836CS Datasheet(PDF) 10 Page - Micro Linear Corporation

Part # ML4836CS
Description  Compact Fluorescent Electronic Dimming Ballast Controller
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4836CS Datasheet(HTML) 10 Page - Micro Linear Corporation

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ML4836
10
Figure 9. Lamp Preheat and Interrupt Timers
FUNCTIONAL DESCRIPTION (Continued)
RX
CX
HEAT
INHIBIT
0.625
RSET
LEA_ENB OR
DIMMING LOCKOUT
INTERRUPT
10
RX/CX
S
R
Q
1.75/4.65
+
1.0/1.20
+
1.25/6.65
+
9
In this condition, the minimum operating frequency of the
ballast is set per equation 5 above.
For the IC to be used effectively in dimming ballasts with
higher Q output networks a larger CT value and lower RT
value can be used, to yield a smaller frequency excursion
over the control range (voltage at LFB OUT). The discharge
current is set to 7.5mA. The operation of the oscillator is
hown in Figure 7.
Assuming that IDIS >>IRT:
tC
DIS VCO
T
()
600
(9)
IC BIAS, UNDER-VOLTAGE LOCKOUT AND
THERMAL SHUTDOWN
The IC includes a shunt clamp which will limit the voltage
at VCC to 14.5V (VCCZ). The IC should be fed with
a current limited source, typically derived from the ballast
transformer auxiliary winding. When VCC is below
VCCZ – 1.1V, the IC draws less than 0.55mA of quiescent
current and the outputs are off. This allows the IC to start
using a “bleed resistor” from the rectified AC line. The ICC
start-up condition is shown in Figure 7. To help reduce
ballast cost, the ML4836 includes a temperature sensor
which will inhibit ballast operation if the IC’s junction
temperature exceeds 140°C. In order to use this sensor in
lieu of an external sensor, care should be taken when
placing the IC to ensure that it is sensing temperature at
the physically appropriate point in the ballast. The
ML4836’s die temperature can be estimated with the
following equation:
TT
P
C W
JA
D
@+
+ °
(
/
)
65
(10)
STARTING, RE-START, PREHEAT AND INTERRUPT
The lamp starting scenario implemented in the ML4836
is designed to maximize lamp life and minimize ballast
heating during lamp out conditions.
The circuit in Figure 9 controls the lamp starting scenarios:
Filament preheat and lamp out interrupt. CX is charged
with a current of IR(SET)/4 and discharged through RX. The
voltage at CX is initialized to 0.7V (VBE) at power up. The
time for CX to rise to 4.65V is the filament preheat time.
During that time, the oscillator charging current (ICHG) is
2.5/RSET. This will produce a high frequency for filament
preheat, but will not produce sufficient voltage to ignite
the lamp or cause significant glow current.


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