UBA2035 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
UBA2035 Datasheet PDF : 13 Pages
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NXP Semiconductors
UBA2035
HF Full bridge control IC for HID lighting
Table 2.
Symbol
n.c.
GLL
PGND
n.c.
GLR
n.c.
n.c.
SHR
FSR
GHR
Pin description …continued
Pin
Description
UBA2035TS
19
not connected
20
gate driver output for lower left MOSFET
21
power ground
22
not connected
23
gate driver output for lower right MOSFET
24
not connected
25
not connected
26
source upper right MOSFET
27
floating supply right
28
gate driver upper right MOSFET
7. Functional description
7.1 Supply voltage
The UBA2035 is powered by a supply voltage applied to pin HV, e.g., the supply voltage of
the full bridge. The IC generates its own low supply voltage for its internal circuitry.
Therefore an additional low voltage supply is not required. A capacitor has to be
connected to pin VDD to obtain a ripple-free internal supply voltage. The circuit can also
be powered by a low voltage supply directly applied to pin VDD. In this case pin HV should
be connected to pin VDD or pin SGND. The maximum current that the internal series
regulator can deliver, is temperature dependent. See Figure 3.
7.2 Start-up
With an increasing supply voltage the IC enters the start-up state i.e. the upper power
transistors are set in off-state and the lower power transistors are switched on. During the
start-up state the bootstrap capacitors are charged. The start-up state is defined until
VVDD = Vstartup(VDD) or VHV = Vstartup(HV). The state of the outputs during the start-up phase
is overruled by the bridge disable function.
7.3 Oscillation state
As soon as the supply voltage on pin VDD exceeds Vstartup(VDD) or the supply voltage on
pin HV exceeds Vstartup(HV), the output voltage of the full bridge depends on the control
signals on pins CLK, SU, DD and BD. This is listed in Table 3.
As soon as the supply voltage on pin VDD becomes lower than VUVLO(VDD) or the supply
voltage on pin HV becomes lower than VUVLO(HV), the IC enters the start-up state again.
UBA2035_1
Product data sheet
Rev. 01 — 31 October 2008
© NXP B.V. 2008. All rights reserved.
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