ml4836 Microsemi Corporation, ml4836 Datasheet

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ml4836

Manufacturer Part Number
ml4836
Description
Compact Fluorescent Electronic Dimming Ballast Controller
Manufacturer
Microsemi Corporation
Datasheet
GENERAL DESCRIPTION
The ML4836 is a complete solution for a dimmable or a
non-dimmable high efficiency electronic ballast especially
tailored for a compact fluorescent lamp (CFL). The
Bi-CMOS ML4836 contains controllers for dimming
ballast with end-of-life detection capability.
The ballast controller section provides for programmable
starting sequence with individual adjustable preheat and
lamp out-of-socket interrupt times. The ML4836 provides
latch type shut down comparator for ballast controllers in
the event of end-of-life for the CFL.
BLOCK DIAGRAM
4
6
5
9
R SET
R T /C T
R T2
PWDET
END-OF-LAMP DETECT
POWER SHUTOFF
CONTROL SEQUENCER
VARIABLE FREQUENCY
THREE-FREQUENCY
OSCILLATOR
AND
VCO
Electronic Dimming Ballast Controller
COMPENSATION
DIMMING LEVEL
ANTI-FLASH
INTERFACE
AND
AGND
THERMAL SHUTDOWN
UNDER-VOLTAGE
10
REF
AND
1
V CC
FEATURES
14
Programmable start scenario for rapid/instant start lamps
Triple frequency control network for dimming or
starting to handle various lamp sizes
Programmable restart for lamp out condition to reduce
ballast heating.
Internal over-temperature shutdown
Low start-up current; < 0.55mA
(* Indicates Part is End Of Life as of July 1, 2000)
CONTROL
GATING
LOGIC
AND
LAMP OUT DETECT
AUTOMATIC LAMP
Compact Fluorescent
INTERRUPT TIMERS
PRE-HEAT AND
RESTART
AND
OUTPUT
DRIVERS
INTERRUPT
LAMP FB
OUT A
OUT B
PGND
R X /C X
LEAO
ML4836*
13
12
11
7
2
3
8
PRELIMINARY
July 2000
1

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ml4836 Summary of contents

Page 1

... GENERAL DESCRIPTION The ML4836 is a complete solution for a dimmable or a non-dimmable high efficiency electronic ballast especially tailored for a compact fluorescent lamp (CFL). The Bi-CMOS ML4836 contains controllers for dimming ballast with end-of-life detection capability. The ballast controller section provides for programmable starting sequence with individual adjustable preheat and lamp out-of-socket interrupt times ...

Page 2

... External resistor which SETS oscillator SET F , and R /C MAX Oscillator timing component to set T2 start frequency Oscillator timing components ML4836 14-Pin SOIC (S14) 14-Pin DIP (P14) REF LAMP OUTA LEAO 3 12 OUT B R SET 4 11 PGND R T2 ...

Page 3

... Load Regulation Temperature Stability Total Variation Long Term Stabilty Junction Temperature .............................................. 150ºC Storage Temperature Range...................... –65ºC to 150ºC Lead Temperature (Soldering, 10 sec) ...................... 260ºC Thermal Resistance ( ML4836CP ............................................................... C/W 50mA ML4836CS ............................................................... C/W OPERATING CONDITIONS Temperature Range ........................................ 0°C to 85°C –0.5V 11. 14. SET ...

Page 4

... ML4836 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER REFERENCE BUFFER (Continued) Short Circuit Current R Voltage SET PREHEAT AND INTERRUPT TIMER (R = 346k , Charging Current Open Circuit Voltage Maximum Voltage X X Preheat Lower Threshold Preheat Upper Threshold Start Period End Threshold ...

Page 5

... VCO frequency range. This allows for the 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: REF REF_OK 1 + – ...

Page 6

... ML4836 FUNCTIONAL DESCRIPTION The ML4836 implements a triple frequency operation scheme: programmable three-frequency sequence for pre- heat, ignition, and dimming, that extends lamp life, simplifies lamp network design, and starts lamps at any dimming level without flashing. This addresses the need for a high-Q network for starting sequence and low-Q network for operation, minimizing parasitic losses and improving overall power efficiency ...

Page 7

... R1 Figure 4. Compensation Network PFC Figure 6. Simplified Model of ML4836 EOL Functionality (Continued) END OF LAMP LIFE At the end of a lamp’s life when the emissive material is depleted, the arc current is rectified and high voltage occurs across the lamp near the depleted cathode. The ...

Page 8

... PFC. This voltage is used by the ML4836 to latch off the ballast when it exceeds an internal threshold. An external resistor can be used as the “EOL latch resistor” to set the power level trip point, as shown Figure 6 ...

Page 9

... LFB OUT is at 0V: . DIS I CHG ( ) 0 Highest lamp power, and lowest output frequency are attained when voltage at LFB OUT is at its maximum output voltage ( Waveforms when the ML4836 is Started with a Bleed Resistor from CC ML4836 ( SET at the LAMP FB amplifier ...

Page 10

... STARTING, RE-START, PREHEAT AND INTERRUPT (9) 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. C with a current of I ...

Page 11

... A summary of the operating frequencies in the various X operating modes is shown below. OPERATING MODE Preheat After Preheat Dimming Control Figure10. Lamp Starting and Restart Timing ML4836 OPERATING FREQUENCY [F(MAX) to F(MIN)] 2 F(START) F(MIN) to F(MAX) 7.5 11 ...

Page 12

... ML4836 TYPICAL APPLICATIONS The ML4836 can be used for a variety of lamp types compact fluorescent lamps IEC T8 (linear lamps) T5 linear lamps T12 linear lamps 12 The ML4836 can also be used for dimming applications. For example, 20:1 dimming can be achieved using the ML4836 with external dimming units. The applications schematics shown in Figures 11 and 12 are examples of the various uses of the ML4836 ...

Page 13

... Figure12. DC Input CFL Ballast ML4836 13 ...

Page 14

... ML4836 PHYSICAL DIMENSIONS 14 1 0.017 - 0.027 (0.43 - 0.69) (4 PLACES) 0.012 - 0.020 0.055 - 0.061 (0.30 - 0.51) (1.40 - 1.55) 14 PIN 0.070 MIN (1.77 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN) 14 inches (millimeters) Package: S14 14-Pin SOIC 0.337 - 0.347 (8.56 - 8.81) 0.148 - 0.158 0.228 - 0.244 PIN 1 ID (3.76 - 4.01) (5.79 - 6.20) 0.050 BSC (1.27 BSC) 0.059 - 0.069 (1.49 - 1.75) 0º ...

Page 15

... ORDERING INFORMATION PART NUMBER ML4836CP (End Of Life) ML4836CS (End Of Life) © Micro Linear 1999 registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; ...

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