IR2157_07 IRF [International Rectifier], IR2157_07 Datasheet - Page 2

• Manufacturer Part Number: IR2157_07
• Description: FULLY INTEGRATED BALLAST CONTROL IC
• Manufacturer: IRF [International Rectifier]

IR2157
FAULT Mode
Fault Latch Set
1
V C C = 1 5 . 6 V
Oscillator Off
I
/
Q C C
2
C P H = 0 V
-Bridge Off
CS > 1.0V
(Over-Current or Hard Switching)
CS < 0.2V
(No-Load or Below Resonance)
T
(Over-Temperature)
J
> 175C
1 5 0 A
SD > 2.0V
( L a m p R e m o v a l )
VCC < 9.5V
(Power Turned Off)
or
or
or
CS > 1.0V
(Failure to Strike Lamp
or Hard Switching)
T
(Over-Temperature)
J
> 175C
or
T
(Over-Temperature)
J
> 175C
ADVANCED INFORMATION
IGNITION RAMP Mode
Power Turned On
C P H Charging @ I
C P H Charges to 7.6V Clamp
PREHEAT Mode
CS 0.2V Threshold Enabled
C P H Charging @ I
CS 1V Threshold Enabled
R U N = O p e n C i r c u i t
UVLO Mode
RPH = Open Circuit
R U N = O p e n C i r c u i t
RPH = Open Circuit
1
f
RUN Mode
MIN
/
f
1
Oscillator Off
I
2
C S D i s a b l e d
PH
/
Q C C
-Bridge @ f
2
C P H = 0 V
R P H = 0 V
-Bridge Off
Ramps to f
R U N = 0 V
ramps to f
2
1 5 0 A
VCC > 11.4V ( U V + )
VDC > 5.1V ( B u s O K )
SD < 1.7V ( L a m p O K )
T
CPH > 4.0V
( E n d o f P R E H E A T M o d e )
CPH > 5.1V
(End of IGNITION RAMP)
J
< 175C ( T
PH
PH
PH
a n d
a n d
a n d
MIN
R UN
= 1 A
= 1 A
jmax
)
VCC < 9.5V
(VCC Fault or Power Down)
VDC < 3.0V
(dc Bus/ac Line Fault or Powe
SD > 2.0V
(Lamp Fault or Lamp Remova
or
or