ML4833CP Micro Linear, ML4833CP Datasheet

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ML4833CP

Manufacturer Part Number
ML4833CP
Description
Electronic dimming ballast controller
Manufacturer
Micro Linear
Datasheet
GENERAL DESCRIPTION
The ML4833 is a complete solution for a dimmable or a
non-dimmable, high power factor, high efficiency
electronic ballast. The BiCMOS ML4833 contains
controllers for “boost” type power factor correction as
well as for a dimming ballast. The ML4833 was designed
to minimize the number of external components required
to build an electronic ballast.
The PFC circuit uses a new, simple PFC topology which
requires only one loop for compensation. This system
produces a power factor of better than 0.99 with low
input current THD. An overvoltage protection comparator
inhibits the PFC section in the event of a lamp out or lamp
failure condition.
The ballast controller section provides for programmable
starting sequence with individually adjustable preheat and
lamp out-of-socket interrupt times. The IC controls lamp
output power through feedback. The ML4833 provides a
power down input which reduces power to the lamp, for
GFI, end of life, etc.
BLOCK DIAGRAM
10
18
6
7
9
3
2
1
R
R
R
PDWN
C
PIFB
PEAO
PVFB/OVP
SET
T
X
RAMP
/C
/C
X
T
VARIABLE FREQUENCY
AND INTERRUPT
CONTROLLER
OSCILLATOR
PRE-HEAT
FACTOR
TIMERS
POWER
Electronic Dimming Ballast Controller
GATING LOGIC
FEATURES
CONTROL
UNDER-VOLTAGE
AND THERMAL
Complete power factor correction and dimming
ballast control in one IC
Low distortion, high efficiency continuous boost,
peak current sensing PFC section
Programmable start scenario for rapid or
instant start lamps
Lamp current feedback for dimming control
Variable frequency dimming and starting
Programmable restart for lamp out condition to
reduce ballast heating
Internal over-temperature shutdown replaces
external heat sensor
PFC overvoltage comparator eliminates output
“runaway” due to load removal
Low start-up current <0.5mA
Power reduction pin for end of life and GFI detectors
SHUTDOWN
&
OUTPUT
DRIVERS
INTERRUPT
PFC OUT
LFB OUT
LAMP FB
OUT A
OUT B
PGND
GND
V
VCC
ML4833*
REF
14
13
15
12
16
17
11
8
4
5
PRELIMINARY
July 2000
1

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ML4833CP Summary of contents

Page 1

GENERAL DESCRIPTION The ML4833 is a complete solution for a dimmable or a non-dimmable, high power factor, high efficiency electronic ballast. The BiCMOS ML4833 contains controllers for “boost” type power factor correction as well as for a dimming ballast. The ...

Page 2

ML4833 PIN CONFIGURATION ML4833 18-Pin DIP (P18) PEAO 1 18 PIFB 2 17 PDWN 3 16 LAMP LFB OUT SET INTERRUPT ...

Page 3

... LFB OUT) ................................... –0.3V to 7.7V Maximum Forced Current (PEAO, LFB OUT) ........ ±20mA Junction Temperature ............................................ 150°C Storage Temperature Range ..................... –65°C to 150°C Lead Temperature (Soldering 10 sec.) .................... 260°C Thermal Resistance ( ML4833CP ...................................................... 70°C/W ML4833CS .................................................... 100°C/W OPERATING CONDITIONS –2V CC Temperature Range ........................................ 0°C to 85° ...

Page 4

ML4833 ELECTRICAL CHARACTERISTICS PARAMETER Oscillator (Continued) C Charging Current T C Discharge Current T Output Drive Deadtime Reference Section Output Voltage Line regulation Load regulation Temperature stability Total Variation Output Noise Voltage Long Term Stability Preheat and Interrupt Timer (R ...

Page 5

ELECTRICAL CHARACTERISTICS PARAMETER Outputs (OUT A, OUT B, PFC OUT) Output Voltage Low Output Voltage High Output Voltage Low in UVLO Output Rise/Fall Time Under-Voltage Lockout and Bias Circuits IC Shunt Protection Voltage (V ) CCZ Start-up Current Operating Current ...

Page 6

ML4833 FUNCTIONAL DESCRIPTION OVERVIEW The ML4833 consists of peak 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, allowing for ...

Page 7

TRANSCONDUCTANCE AMPLIFIERS The PFC voltage feedback amplifier is implemented as an operational transconductance amplifier designed to have low small signal forward transconductance such that a large value of load resistor (R1) and a low value ceramic capacitor (<1µF) ...

Page 8

ML4833 Figure 4 shows the output configuration for the operational transconductance amplifiers. CURRENT MIRROR IN OUT gmV gmV IN IQ – OUT CURRENT MIRROR Figure 4. Output Configuration A DC path to ground or ...

Page 9

This assumes that t >> CHG DIS When LFB OUT is high and the minimum CH frequency occurs. The charging current varies according to two control inputs to the oscillator: 1. The output of the ...

Page 10

ML4833 0.625 R SET 1.2/4 6.8 1.2/6.8 INTERRUPT – 1.25V Figure 8. Lamp Preheat and Interrupt Timers LFB OUT is ignored by the oscillator until C 6.8V threshold. The ...

Page 11

Figure 10. 220V Dimming Ballast ML4833 11 ...

Page 12

ML4833 PHYSICAL DIMENSIONS 18 PIN 0.045 MIN (1.14 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN) 0.449 - 0.463 (11.40 - 11.76) 18 PIN 0.024 - 0.034 0.050 BSC (0.61 - ...

Page 13

... ORDERING INFORMATION PART NUMBER ML4833CP (End of Life) ML4833CS (Obsolete) © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; ...

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