UBA2032T PHILIPS [NXP Semiconductors], UBA2032T Datasheet - Page 5

• Manufacturer Part Number: UBA2032T
• Description: Full bridge driver IC
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
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
circuit can also be powered by a low voltage supply directly
applied to pin V
connected to pin V
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
Voltage Lock-out. The state of the outputs during the
start-up phase is overruled by the bridge disable function.
2002 Oct 07
handbook, halfpage
Full bridge driver IC
DD
DD
to obtain a ripple-free internal supply voltage. The
= V
DD(UVLO)
Fig.2 Pin configuration (SO24).
EXTDR
SGND
V DD
DD
LVS
LVS
n.c.
n.c.
DD
RC
HV
SU
BD
. In this case pin HV should be
DD
10
11
12
1
2
3
4
5
6
7
8
9
, where UVLO stands for Under
or SGND.
UBA2032T
MGU543
24
23
22
21
20
19
18
17
16
15
14
13
GHR
FSR
SHR
n.c.
GLR
n.c.
PGND
GLL
n.c.
SHL
FSL
GHL
5
Release of the power drive
At the moment the supply voltage on pin V
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 the
pins DD and 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
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:
handbook, halfpage
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.
Fig.3 Pin configuration (SSOP28).
EXTDR
SGND
V DD
LVS
LVS
n.c.
n.c.
n.c.
n.c.
DD
RC
HV
SU
BD
10
11
12
13
14
1
2
3
4
5
6
7
8
9
UBA2032TS
DD
MGU544
or HV decreases and
Preliminary specification
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GHR
FSR
SHR
n.c.
n.c.
GLR
n.c.
PGND
GLL
n.c.
n.c.
SHL
FSL
GHL
UBA2032
DD
or HV