ML4835CP MICRO-LINEAR [Micro Linear Corporation], ML4835CP Datasheet

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ML4835CP

Manufacturer Part Number
ML4835CP
Description
Compact Fluorescent Electronic Dimming Ballast Controller
Manufacturer
MICRO-LINEAR [Micro Linear Corporation]
Datasheet
GENERAL DESCRIPTION
The ML4835 is a complete solution for a dimmable or a
non-dimmable, high power factor, high efficiency
electronic ballast especially tailored for a compact
fluorescent lamp (CFL). The Bi-CMOS ML4835 contains
controllers for “boost” type power factor correction as
well as for a dimming ballast with end-of-lamp life
detection.
The PFC circuits uses a new , simple PFC topology which
requires only one loop for compensation. In addition,
this PFC can be used with either peak- or average-current
mode. This system produces a power factor of better than
0.99 with low input current THD.
The ballast controller section provides for programmable
starting sequence with individual adjustable preheat and
lamp out-of-socket interrupt times. The ML4835 provides
a shut down for both PFC and ballast controllers in the
event of end-of-life for the CFL.
BLOCK DIAGRAM
13
12
4
3
2
1
7
9
8
C RAMP
PIFBO
PIFB
PEAO
PVFB/OVP
R SET
R T /C T
R T2
PWDET
END-OF-LAMP DETECT
CONTROLLER
Compact Fluorescent Electronic Dimming
POWER SHUTOFF
CONTROL SEQUENCER
VARIABLE FREQUENCY
FACTOR
POWER
THREE-FREQUENCY
OSCILLATOR
AND
VCO
POWER DIMMING LEVEL
COMPENSATION
AGND
ANTI-FLASH
INTERFACE
THERMAL SHUTDOWN
AND
UNDER-VOLTAGE
14
REF
AND
20
V CC
FEATURES
19
Power detect for end-of-lamp-life detection
Low distortion , high efficiency continuous boost, peak
or average current sensing PFC section
Leading- and trailing-edge synchronization between
PFC and ballast
One to one frequency operation between PFC and
ballast
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
PFC over-voltage comparator eliminates output
“runaway” due to load removal
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
INTERRUPT TIMERS
PRE-HEAT AND
RESTART
AND
Ballast Controller
OUTPUT
DRIVERS
INTERRUPT
PFC OUT
LAMP FB
OUT A
OUT B
PGND
R X /C X
LEAO
ML4835*
10
17
16
18
15
11
5
6
PRELIMINARY
July 2000
1

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ML4835CP Summary of contents

Page 1

Compact Fluorescent Electronic Dimming GENERAL DESCRIPTION The ML4835 is a complete solution for a dimmable or a non-dimmable, high power factor, high efficiency electronic ballast especially tailored for a compact fluorescent lamp (CFL). The Bi-CMOS ML4835 contains controllers for “boost” ...

Page 2

ML4835 PIN CONFIGURATION PIN DESCRIPTION PIN NAME FUNCTION 1 PVFB/OVP Inverting input to the PFC error amplifier and OVP comparator input. 2 PEAO PFC error amplifier output and compensation node 3 PIFB Senses the inductor current and peak current sense ...

Page 3

... PFC OVP COMPARATOR OVP Threshold Hysteresis Propagation Delay Junction Temperature .............................................. 150ºC Storage Temperature Range ...................... –65ºC to 150ºC Lead Temperature (Soldering, 10 sec) ..................... 260ºC Thermal Resistance ( ML4835CP .......................................................... 65ºC/W 65mA ML4835CS .......................................................... 80ºC/W OPERATING CONDITIONS Temperature Range ....................................... 0°C to 85°C –0.5V 11. 15. ...

Page 4

ML4835 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER OSCILLATOR Initial Accuracy (F ) MIN Voltage Stability (F ) MIN Temperature Stability (F ) MIN Total Variation (F ) MIN Initial Accuracy (START) Voltage Stability (START) Temparature Stability (START) Total Variation (START) Ramp Valley ...

Page 5

ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER PREHEAT AND INTERRUPT TIMER (R = 346k , C X Initial Preheat Period Subsequenct Preheat Period Interrupt Period R /C Charging Current Open Circuit Voltage Maximum Voltage X ...

Page 6

ML4835 FUNCTIONAL DESCRIPTION The ML4835 consists of peak or average current controlled continuous boost power factor front end section with a flexible ballast control section. Start-up and lamp- out retry timing are controlled by the selection of external timing components, ...

Page 7

FUNCTIONAL DESCRIPTION The ML4835 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 ...

Page 8

ML4835 FUNCTIONAL DESCRIPTION Setting minimum input voltage for output regulation can be achieved by selecting C as follows for peak RAMP current mode PEAO = - - D  MAX  ...

Page 9

LEA_ENB INTERRUPT 10 – + 1.25/1. 0.625 R 7.5V SET – + 4.75/1.25V CLOCK V = 3.75V 1.25V TL Figure ...

Page 10

ML4835 FUNCTIONAL DESCRIPTION (C1) in the frequency compensation network. The compensation network shown in Figure 5 will introduce a zero and a pole at ...

Page 11

FUNCTIONAL DESCRIPTION Highest lamp power, and lowest output frequency are attained when voltage at LFB OUT is at its maximum output voltage ( this condition, the minimum operating frequency of the ballast is set per equation 5 ...

Page 12

ML4835 TYPICAL APPLICATIONS The ML4835 can be used for a variety of lamp types compact fluorescent lamps IEC T8 (linear lamps) T5 linear lamps T12 linear lamps HEAT LEA_ENB ...

Page 13

R4, 62k L1 HOT D1-D4: 1A, 600V F1 D8, 1A, 600V 3.3nF 0.15µF 120V RMS 3.3nF D10, 0.1A NEUTRAL 75V D5 C5 1A, 50V 0.1µ ...

Page 14

ML4835 R4, 62k L1 HOT D1-D4: 1A, 600V F1 D8, 1A, 600V 3.3nF 0.15µF 120V RMS 3.3nF D10, 0.1A NEUTRAL 75V D9, 0.1A D5 75V C5 1A, ...

Page 15

R4, 62k L1 HOT D1-D4: 1A, 600V F1 D8, 1A, 600V 3.3nF 0.15µF 120V RMS 3.3nF D10, 0.1A NEUTRAL 75V D9, 0.1A D5 75V C5 1A, 50V ...

Page 16

ML4835 PHYSICAL DIMENSIONS 0.498 - 0.512 (12.65 - 13.00) 20 PIN 0.024 - 0.034 0.050 BSC (0.61 - 0.86) (1.27 BSC) (4 PLACES) 0.012 - 0.020 0.090 - 0.094 (0.30 - 0.51) (2.28 - 2.39) 20 PIN ...

Page 17

... PHYSICAL DIMENSIONS ORDERING INFORMATION PART NUMBER ML4835CP (End Of Life) ML4835CS (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; 5,418,502; ...

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