TPS64200,TPS64201

TPS64202,TPS64203

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

VI

1.8 V to 5.5 V

10

µF

TPS64200

R(ISENSE) = 150 mΩ

47

µF

X7R

−7 V / 50 mA

CDRH4D28-100

750 k

Ω

R1

_

+

VI

130 k

Ω

R2

SW

OPA363

SW

L

VIN

GND

DO

FB

CTRL

PGND

4.7

µH

56 k

Ω

12 k

Ω

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