IR2159 International Rectifier, IR2159 Datasheet - Page 21

• Manufacturer Part Number: IR2159
• Description: IC BALLAST CONTROL DIM 16-DIP
• Manufacturer: International Rectifier
• Type: Ballast Controllerr

Specifications of IR2159

• Frequency: 25 ~ 95 kHz
• Current - Supply: 10mA
• Voltage - Supply: 12.5 V ~ 15.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -

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The internal blank time reduces the dimming range
slightly (Figure 15) when operating at minimum
phase shift (maximum lamp power). The external
programming resistor on pin MAX must be
selected such that the minimum phase shift is
set a safe margin away from the blank time. A
series resistor (R1) is required to limit the amount
of current flowing out of pin CS when the voltage
across RCS goes below -0.7V. A filter capacitor
at pin CS may be required due to other possible
asynchronous noise sources present in the ballast
system.
detection comparator for 400ns after LO goes 'high'
(Figure 15).
V
V
BUS
BUS
(+)
(-)
Figure 14, Current sensing circuitry.
CONTROL
PHASE
BLANK
400ns
FAULT
LOGIC
Half
Bridge
Driver
IR2159
1.6V
16
15
11
10
12
HO
VS
LO
CS
COM
R1
Q2
Q2
RCS
Load
Return
Half
Bridge
Output
I
LOAD
Fault Mode (FAULT)
During dimming, the peak current regulation circuit
active during preheat and ignition is disabled.
Should non-zero voltage switching at the output
of the half-bridge occur (Figure 16), high current
spikes will result. A lamp filament failure, lamp
end-of-life, lamp removal, or a deadtime shorter
than what is required for commutation, can all
cause hard-switching.
1 . 6 V
H O
LO
VS
V
CS
J
V
L O
B L A N K
Figure 15, Current sense timing diagram.
C S
Figure 16, hard-switching with latch off
IR2159/IR21591
O P E R A T I O N
N O R M A L
Switching
Noise
D i m m i n g
R a n g e
R E M O V A L
L O A D
S W I T C H I N G
H A R D
F A U L T
t
t
t
( S )
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