Philips Semiconductors
Full bridge driver IC
Application with negative lamp voltage
The life of an HID lamp depends of the rate of sodium
migration through the quartz wall of the lamp. To minimize
this, the lamp must operate negative with respect to the
system ground. Figure 7 shows a full bridge with an HID
lamp, along with a control circuit referenced to the system
Product speci?cation
UBA2032
ground and with a bridge voltage operating at high
negative voltages with respect to the system ground.
Pin +LVS and pin HV can be connected to the same
supply as the control unit The output state of the bridge is
related to the position of pin EXTDR. See also the timing
diagram.
handbook, full pagewidth
system
GND
BRIDGE
CONTROL
UNIT
+ low voltage supply
? LVS
1
28
GHR
R >100 ? (1)
HR
HL
R >100 ? (1)
EXTDR
2
27
FSR
+ LVS
3
26
SHR
C1
Ci
HV
VDD
SU
6
9
10
UBA2032TS
23
21
GLR
PGND
R >100 ? (1)
LR
IGNITOR
LL
R >100 ? (1)
DD
11
20
GLL
C3
BD
RC
SGND
12
13
14
17
16
15
SHL
FSL
GHL
C2
MGU803
high voltage
? 450 V (max)
(1) See Section “Gate resistors”.
Fig.7 Application with a negative lamp voltage.
2005 Mar 24
14
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