Datasheet
SLVS485 − AUGUST 2003
www.ti.com
20
The TPS6420x can be used for an inverter. Only one additional operational amplifier is required for this
application. When the PMOS is switched on, the current in the inductor ramps up to its maximum, set by Rs.
Then the PMOS is switched off, the energy stored in the inductor is transferred to the output. The output voltage
and the maximum output current can be calculated using:
V
O
+
R1
R2
V
FB
I
O
max [ 0.8
V
I
–V
O
V
(ISENSE)
2R
(ISENSE)
(27)
OLED Power Supply
The TPS6420x can be combined with a TPS61045 boost converter for a OLED power supply.
SW
MBR0530T1
Si2301DS
EN
GND
FB
VIN
ISENSE
V
I
1.8 V to 5.5 V
10 µF
TPS64200
R
(ISENSE)
= 150 mΩ
47 µF
X7R
−7 V / 50 mA
CDRH4D28-100
750 kΩ
R1
_
+
V
I
130 kΩ
R2
SW
OPA363
SWL
VIN
GND
DO
FB
CTRL
PGND
4.7 µH
56 kΩ
12 kΩ
22 pF
4.7 µF
TPS61045
7 V / 50 mA
1 µF
X7R
1
2
3
6
5
4
1
2
5
8
3
4
67
10 µH
Figure 24. Application For a OLED Power Supply