IR2157_07 Datasheet, PDF (1/20 Pages) International Rectifier – FULLY INTEGRATED BALLAST CONTROL IC

ADVANCED INFORMATION
Data Sheet No. PD60108B
IR2157
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}
• ^{Protection from low-line condition & automatic}
restart (mimics a magnetic ballast)
Description
• ^{Thermal overload protection}
• ^{Programmable deadtime}
• ^{Integrated 600V level-shifting gate driver}
• ^{Internal 15.6V zener clamp diode on VCC}
• ^{True micropower startup (150uA)}
• ^{Latch immunity protection on all leads}
• ^{ESD protection on all leads}
Packages
The IR2157 is a fully integrated, fully protected 600V ballast control IC designed to
drive virtually all types of rapid start fluorescent lamp ballasts. Externally program-
mable features such as preheat time & frequency, ignition ramp characteristics, 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 programmmable deadtime. Precise control of a 50% duty cycle is
accomplished using a T-flip-flop. The IR2157 is available in both 16 pin DIP and 16
pin narrow body SOIC packages.
Typical Connection
16 Lead SOIC
(narrow body)
16 Lead PDIP
+ Rectified AC Line
+ V_BUS
R2
R1
C1
C _PH
C _IGN R _PH
R_T
R _RUN
C _START R _START
C_T
R _DT
C2
VDC
1
CPH
2
RPH
3
RT
4
RUN
5
CT
6
DT
7
SD
8
V_BUS return
HO
16
VS
15
VB
14
N/C
13
VCC
12
COM
11
LO
10
CS
9
R _Supply
Q1
R _GHS
C _BS
D _BOOT
C _VCC
D1
Q2
R _GLS
R3
R _CS
C _BLOCK
L _RES
C _SNUBBER
R _SNUBBER
D2
C _RES
R4
R5