April 21st, 2008
IRS21571D
FULLY INTEGRATED BALLAST CONTROL IC


IC Features
• Programmable preheat time and frequency
• Programmable ignition ramp
• Protection from failure-to-strike
• Lamp filament sensing and 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
•
Thermal overload protection

• Programmable deadtime
• Integrated 600V level-shifting gate driver
• Integrated bootstrap MOSFET
•
Integrated 15.6V zener clamp diode on VCC

•
Low micro-power start-up

• Latch immunity and ESD on all pins

Typical Application

•
Fluorescent lamp ballast






Typical Connection Diagram

Product Summary
Topology Half-Bridge
V
OFFSET
600 V
I
O+
& I
O-
(typical) 180 mA & 260 mA
Oscillator Frequency

+/- 5%

Start-up current (typical)

150 µA


Package Options


16-Lead SOIC (Narrow Body)





+ V
BUS
+ Rectified AC Line
V
BUS
return
R
PH
R
RUN
R
T
C
T
C
RAMP
C
PH
R
DT
C
BS
R
Supply
C
VCC
R
CS
L
RES
C
RES
R
GHS
R
GLS
C
BLOCK
C
SNUBBER
R1
R2
C1
R
OC R4
R3
R5
C2
D1
D2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IRS21571D
VDC
CPH
RPH
RT
RUN
CT
DT
OC
LO
COM
VCC
VB
VS
HO
SD
CS



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