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Philips Semiconductors
Full bridge driver IC
Product speci?cation
UBA2032
handbook, halfpage
? LVS 1
EXTDR
2
24 GHR
23 FSR
handbook, halfpage
? LVS 1
EXTDR 2
28 GHR
27 FSR
+ LVS
3
22 SHR
+ LVS
3
26 SHR
n.c.
HV
n.c.
4
5
6
21 n.c.
20 GLR
19 n.c.
n.c. 4
n.c. 5
HV 6
25 n.c.
24 n.c.
23 GLR
UBA2032T
VDD
7
18 PGND
n.c. 7
22 n.c.
UBA2032TS
SU
DD
8
9
17 GLL
16 n.c.
n.c. 8
VDD 9
21 PGND
20 GLL
BD 10
RC 11
SGND 12
MGU543
15 SHL
14 FSL
13 GHL
SU 10
DD 11
BD 12
RC 13
SGND 14
19 n.c.
18 n.c.
17 SHL
16 FSL
15 GHL
MGU544
Fig.2 Pin configuration (SO24).
FUNCTIONAL DESCRIPTION
Supply voltage
The UBA2032 is powered by a supply voltage applied to
pin HV, for instance the supply voltage of the full bridge.
The IC generates its own low supply voltage for the
internal circuitry. Therefore an additional low voltage
supply is not required. A capacitor has to be connected to
pin V DD to obtain a ripple-free internal supply voltage. The
circuit can also be powered by a low voltage supply directly
applied to pin V DD . In this case pin HV should be
connected to pin V DD or pin SGND.
Start-up
With an increasing supply voltage the IC enters the
start-up state; the higher power transistors are kept off and
the lower power transistors are switched on. During the
start-up state the bootstrap capacitors are charged and the
bridge output current is zero. The start-up state is defined
until V DD = V DD(UVLO) , where UVLO stands for Under
Voltage Lock-Out. The state of the outputs during the
start-up phase is overruled by the bridge disable function.
2005 Mar 24
5
Fig.3 Pin configuration (SSOP28).
Release of the power drive
At the moment the supply voltage on pin V DD or pin HV
exceeds the level of release power drive, the output
voltage of the bridge depends on the control signal on
pin EXTDR; see Table 1. The bridge position after
start-up, disable or delayed start-up (via pin SU), depends
on the status of pin DD and pin EXTDR. If pin DD = LOW
(divider enabled) the bridge will start in the pre-defined
position pin GLR and pin GHL = HIGH and pin GLL and
pin GHR = LOW. If pin DD = HIGH (divider disabled) the
bridge position will depend on the status of pin EXTDR.
If the supply voltage on pin V DD or pin HV decreases and
drops below the reset level of power drive the IC enters the
start-up state again.
Oscillation
At the point where the supply voltage on pin HV crosses
the level of release power drive, the bridge begins
commutating between the following two defined states:
? Higher left and lower right MOSFETs on,
higher right and lower left MOSFETs off
? Higher left and lower right MOSFETs off,
higher right and lower left MOSFETs on.
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