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Philips Semiconductors
Full bridge driver IC
APPLICATION INFORMATION
Basic application
A basic full bridge configuration with an HID lamp is shown
in Fig.5. The bridge disable, the start-up delay and the
external drive functions are not used in this application.
The pins ? LVS, +LVS, EXTDR and BD are short-circuited
to SGND. The internal oscillator is used and to realise a
50% duty cycle the internal divider function has to be used
by connecting pin DD to pin SGND.
voltage
handbook, full pagewidth
550 V (max)
Product speci?cation
UBA2032
The IC is powered by the high voltage supply. Because
the internal oscillator is used, the bridge commutating
frequency is determined by the values of R osc and C osc .
The bridge starts oscillating when the HV supply voltage
exceeds the level of release power drive (typically 12.5 V
on pin HV). If the supply voltage on pin HV drops below the
reset level of power drive (typically 10 V on pin HV), the
UBA2032 enters the start-up state.
? LVS
1
24
GHR
R >100 ? (1)
HR
HL
R >100 ? (1)
EXTDR
+ LVS
2
3
23
22
FSR
SHR
C1
HV
VDD
5
7
UBA2032T
20
GLR
R >100 ? (1)
LR
IGNITOR
LL
R >100 ? (1)
Ci
SU
8
18
PGND
C3
Rosc
Cosc
DD
BD
RC
SGND
9
10
11
12
17
15
14
13
GLL
SHL
FSL
GHL
C2
GND
(1) See Section “Gate resistors”.
Fig.5 Basic configuration.
MGU546
2005 Mar 24
12
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