IR21571 View Datasheet(PDF) - International Rectifier
Part Name
Description
Manufacturer
IR21571 Datasheet PDF : 17 Pages
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Data Sheet PD No. 60179-D
IR21571(S)
FULLY INTEGRATED BALLAST CONTROL IC
Features
• Programmable preheat time & frequency
• Programmable ignition ramp
• Protection from failure-to-strike
• Lamp filament sensing & protection
• Protection from operation below resonance -
0.2V CS threshold sync’d to falling edge on LO
• Protection from low-line condition
• Automatic restart for lamp exchange
Description
• Thermal overload protection
• Programmable deadtime
• Integrated 600V level-shifting gate driver
• Internal 15.6V zener clamp diode on VCC
• Micropower startup (150uA)
• Latch immunity protection on all leads
• ESD protection on all leads
Packages
The IR21571 is a fully integrated, fully protected 600V ballast control IC designed
to drive virtually all types of rapid start fluorescent lamp ballasts. Externally pro-
grammable features such as preheat time & frequency, ignition ramp characteris-
tics, and running mode operating frequency provide a high degree of flexibility for
the ballast design engineer. Comprehensive protection features such as protection
from failure of a lamp to strike, filament failures, low dc bus conditions, thermal
overload, or lamp failure during normal operation, as well as an automatic restart
function, have been included in the design. The heart of this control IC is a variable
frequency oscillator with externally programmable deadtime. Precise control of a
50% duty cycle is accomplished using a T-flip-flop. The IR21571 is available in both
16 pin DIP and 16 pin narrow body SOIC packages.
16 Lead SOIC
(narrow body)
16 Lead PDIP
Typical Connection
+ Rectified AC Line
+ VBUS
R2
R1
C1
CPH
CRAMP RPH
RT
RRUN
CSTART RSTART
CT
ROC
RDT
VDC
1
CPH
2
RPH
3
RT
4
RUN
5
CT
6
DT
7
OC
8
HO
16
VS
15
VB
14
VCC
13
COM
12
LO
11
CS
10
SD
9
RSupply
RGHS
CBS
DBOOT
CVCC
R3 RGLS
R4
C2 RCS
CBLOCK LRES
CSNUBBER
D1
D2
R5
CRES
VBUS return
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