UBA3070T NXP [NXP Semiconductors], UBA3070T Datasheet - Page 6

• Manufacturer Part Number: UBA3070T
• Description: LED backlight driver IC
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
8. Limiting values
UBA3070_2
Product data sheet
7.8 Overtemperature protection
7.9 Driver
The charge current I
below approximately 0.5 V. If the voltage on pin SENSE exceeds 0.5 V, the soft start
current source will start limiting current I
switched off, see
An accurate temperature protection is provided in the UBA3070. When the junction
temperature exceeds the thermal shutdown temperature of typically 140 C the converter
will stop switching.
The driver circuit to the gate of the power FET has a current sourcing capability of 135 mA
typical and a current sinking capability of 560 mA typical. This permits fast turn-on and
turn-off of the FET for efficient operation. A low driver source current has been chosen to
limit the V/ t at turn-on thereby reducing EMI and voltage spikes across R
driver circuit to the gate of the power MOSFET has a current sourcing capability of
135 mA typical and a current sink capability of 560 mA typical. This permits fast turn-on
and turn-off of the power MOSFET for efficient operation.
Table 3.
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Voltages
V
V
V
V
V
Currents
I
PWM
Fig 4.
CC
PWM
MASK
SENSE
DRAIN
Soft start-up
Limiting values
Parameter
supply voltage
voltage on pin PWM
voltage on pin MASK
voltage on pin SENSE
voltage on pin DRAIN
current on pin PWM
Figure
ch
Rev. 02 — 2 December 2008
will flow as long as the voltage on pin SENSE is
4.
I startup(soft)
0.5 V
start-up
V ocp
Conditions
current limited
current limited
current limited
ch
6
. At V
SENSE
startup
R ss
C ss
, the I
014aaa254
ch
current source is completely
R sense
Min
0.4
0.4
0.4
0.4
0.4
[1]
-
LED backlight driver IC
Max
UBA3070
© NXP B.V. 2008. All rights reserved.
+650
+20
+5
5
-
-
sense
Unit
.The
mA
V
V
V
V
V
[1]
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