ML4831CP Micro Linear, ML4831CP Datasheet

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ML4831CP

Manufacturer Part Number
ML4831CP
Description
Electronic ballast controller
Manufacturer
Micro Linear
Datasheet
GENERAL DESCRIPTION
The ML4831 is a complete solution for a dimmable, high
power factor, high efficiency electronic ballast. Contained
in the ML4831 are controllers for “boost” type power
factor correction as well as for a dimming ballast.
The Power factor circuit uses the average current sensing
method with a gain modulator and over-voltage
protection. This system produces power factors of better
than 0.99 with low input current THD at > 95%
efficiency. Special care has been taken in the design of the
ML4831 to increase system noise immunity by using a
high amplitude oscillator, and a current fed multiplier. An
over-voltage protection comparator inhibits the PFC
section in the event of a lamp out or lamp failure
condition.
The ballast section provides for programmable starting
scenarios with programmable preheat and lamp out-of-
socket interrupt times. The IC controls lamp output
through either frequency modulation using lamp current
feedback.
The ML4831 is designed using Micro Linear‘s Semi-
Standard tile array technology. Customized versions of this
IC, optimized to specific ballast architectures can be made
available. Contact Micro Linear or an authorized
representative for more information.
BLOCK DIAGRAM
10
18
7
8
2
4
3
1
R(SET)
R(T)/C(T)
R(X)/C(X)
IA OUT
IA+
I(SINE)
EA OUT
EA–/OVP
AND INTERRUPT
CONTROLLER
OSCILLATOR
PRE-HEAT
FACTOR
POWER
TIMERS
GATING LOGIC
Electronic Ballast Controller
CONTROL
UNDER-VOLTAGE
AND THERMAL
SHUTDOWN
&
FEATURES
Complete Power Factor Correction and Dimming
Ballast Control on one IC
Low Distortion, High Efficiency Continuous Boost,
Average 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
Over-Temperature Shutdown replaces external heat
sensor for safety
PFC Over-Voltage comparator eliminates output
“runaway” due to load removal
Large oscillator amplitude and gain modulator
improves noise immunity
* This product is End Of Life as of July 1, 2000
OUTPUT
DRIVERS
ML4831*
INTERRUPT
LAMP F.B.
PFC OUT
LFB OUT
OUT A
OUT B
PGND
GND
V
VCC
JULY 2000
REF
14
13
15
12
16
17
11
9
5
6
1

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ML4831CP Summary of contents

Page 1

... The IC controls lamp output through either frequency modulation using lamp current feedback. The ML4831 is designed using Micro Linear‘s Semi- Standard tile array technology. Customized versions of this IC, optimized to specific ballast architectures can be made available. Contact Micro Linear or an authorized representative for more information ...

Page 2

ML4831 PIN CONFIGURATION PIN DESCRIPTION PIN# NAME FUNCTION 1 EA OUT PFC Error Amplifier output and compensation node 2 IA OUT Output and compensation node of the PFC average current transconductance amplifier. 3 I(SINE) PFC gain modulator input. 4 IA+ ...

Page 3

ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Supply Current (I ) ............................................... 75mA CC Output Current, ...

Page 4

ML4831 ELECTRICAL CHARACTERISTICS PARAMETER Oscillator Initial accuracy Voltage stability Temperature stability Total Variation Ramp Valley to Peak C(T) Charging Current (FM Modes) C(T) Discharge Current Output Drive Deadtime Reference Section Output Voltage Line regulation Load regulation Temperature stability Total Variation ...

Page 5

ELECTRICAL CHARACTERISTICS PARAMETER OVP Comparator (Pin 18) OVP Threshold Hysteresis Propagation Delay Outputs Output Voltage Low Output Voltage High Output Voltage Low in UVLO Output Rise/Fall Time Under-Voltage Lockout and Bias Circuits IC Shunt Voltage (V ) CCZ V Load ...

Page 6

ML4831 AVERAGE CURRENT AND OUTPUT VOLTAGE REGULATION The PWM regulator in the PFC Control section will act to offset the positive voltage caused by the multiplier output by producing an offsetting negative voltage on the current sense resistor at Pin ...

Page 7

Figure 3 shows the output configuration for the operational transconductance amplifiers. CURRENT MIRROR IN OUT gmV gmV IN IQ – OUT CURRENT MIRROR Figure 3. Output Configuration A DC path to ground or VCC ...

Page 8

ML4831 The oscillator’s minimum frequency is set when I where OSC This assumes that t >> CHG DIS When LFB OUT is high and the minimum ...

Page 9

R(SET) R(X)/C( C(X) – 1.2/3.4 R(X) 6.8 + – 1.2/6.8 INT – REF Figure 7. Lamp Preheat and Interrupt Timers 6.8 3.4 R(X)/C(X) 1.2 .65 0 HEAT DIMMING LOCKOUT 7.5 INT INHIBIT LFB OUT ...

Page 10

ML4831 APPLICATIONS POWER FACTOR CORRECTED FLUORESCENT DIMMING LAMP BALLAST Figure 9. Typical Application: 2-Lamp Isolated Dimming Ballast with Active Power Factor Correction for 120VAC Input 10 ML4831 ...

Page 11

TABLE 1: PARTS LIST FOR THE ML4831EVAL EVALUATION KIT CAPACITORS QTY. REF. DESCRIPTION 2 C1, 2 3.3nF, 125VAC, 10%, ceramic, “Y” capacitor 1 C3 0.33 F, 250VAC, “X”, capacitor 4 C4 0.1 F, 50V, 10%, ceramic capacitor ...

Page 12

... Secondary = 50 turns 30AWG magnet wire, start pin #5, end pin #8 12 MFR. Yageo Yageo Dale Yageo Bourns Motorola Motorola GI Motorola Micro Linear IR = 3mH, Custom Coils P/N 5037 or Coiltronics P/N CTX05-12539-1 PRI (Continued) PART NUMBER 100K-Q 681K-Q SMA4-10K-1 33-Q 3386P-253-ND 1N4007TR 1N4001TR BYV26C 1N4148TR ML4831CP IR720 ...

Page 13

TABLE 1: PARTS LIST FOR ML4831EVAL EVALUATION KIT MAGNETICS: (Continued) QTY. REF. DESCRIPTION Inductor, L PRI E24/25 core set, TDK PC40 material 10 pin horizontal bobbin (Plastron #0722B-31-80) Wind as follows: 1st: 170T of 25AWG magnet wire; ...

Page 14

... MIN (3.18 MIN) ORDERING INFORMATION PART NUMBER ML4831CP © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Micro Linear 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; ...

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