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IR2157S Datasheet

  • IR2157S

  • Ballast Control. Below Resonance Protection. Thermal Overloa...

  • 20頁

  • ETC

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ADVANCED INFORMATION
Data Sheet No. PD60108B
IR2157
FULLY INTEGRATED BALLAST CONTROL IC
Features
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Programmable preheat time & frequency
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Programmable ignition ramp
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Protection from failure-to-strike
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Lamp filament sensing & protection
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Protection from operation below resonance
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Protection from low-line condition & automatic
restart (mimics a magnetic ballast)
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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
Description
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.
Packages
16 Lead SOIC
(narrow body)
16 Lead PDIP
Typical Connection
+ Rectified AC Line
+ V
BUS
R2
R1
VDC
HO
R
Supply
1
16
VS
Q1
R
GHS
C
BS
C
SNUBBER
N/C
C1
C
PH
C
IGN
R
T
C
START
R
START
C
T
R
DT
R
PH
R
RUN
CPH
C
BLOCK
L
RES
2
15
IR2157
RPH
VB
3
RT
14
13
VCC
4
RUN
D
BOOT
R
SNUBBER
C
RES
D2
5
CT
12
COM
C
VCC
D1
6
DT
11
LO
7
SD
10
CS
Q2
R
GLS
R3
R
CS
R5
R4
8
C2
9
V
B U S
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