Features
•
Ballast control and half-bridge driver in one IC
•
Transformer-less lamp power sensing
•
Closed-loop lamp power control
•
Closed-loop preheat current control
•
Programmable preheat time
•
Programmable preheat current
•
Lamp ignition detection
•
Programmable ignition-to-dim time
•
0.5 to 5VDC dimming control input
•
Min and max lamp power adjustments
•
Programmable minimum frequency
•
Internal current sense blanking
Data Sheet No. PD60194 revD
DIMMING BALLAST CONTROL IC
Typical Connection
Description
Description: The IR21592/IR21593 are complete dimming ballast controllers and 600V
half-bridge drivers all in one IC. The architecture includes phase control for trans-
former-less lamp power sensing and regulation which minimizes changes needed to
adapt non-dimming ballasts for dimming. Externally programmable features such as
preheat time and current, ignition-to-dim time, and a complete dimming interface with
minimum and maximum settings provide a high degree of flexibility for the ballast
design engineer. Protection from failure of a lamp to strike, filament failures, 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 voltage-
controlled oscillator with externally programmable minimum frequency. The IR21592/
IR21593 are available in both 16 pin DIP and 16 pin narrow body SOIC packages.
16
15
14
134
3
2
1
5
6
7
11
10
8 9
12
VDC
VCO
IPH
FMIN
MIN
MAX
DIM
CPH
CS
LO
COM
VCC
VB
VS
HO
SD
+ DC Bus
+ Rectified AC Line
- DC Bus
R
MIN
C
PH
C
VCO
R
CS
R
MAX
R
FMIN
R
IPH
0.5 to 5VDC
R
DIM
C
VDC
R
VDC
R
VAC
R
PULL-UP
Single Lamp Dimmable
Packages
16 Lead SOIC
(narrow body)
www.irf.com 1
IR21592
(
S
)
&
(
PbF
)
IR21593
(
S
)
&
(
PbF
)
•
Full lamp fault protection
•
Brown-out protection
•
Automatic restart
•
Micro-power startup
•
Zener clamped Vcc
•
Over-temperature protection
•
16-pin DIP and SOIC package types
16 Lead PDIP
Parameter IR21592 IR21593