TLD5098EL_15 datasheet(10/41 Pages) INFINEON

Part #	TLD5098EL

Description	Multitopology LITIX Power DC/DC Controller IC

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Manufacturer	INFINEON [Infineon Technologies AG]

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Data Sheet

10

Revision1.2

2015-03-12

Infineon® LITIX™ Power

TLD5098EL

Switching Regulator

5

Switching Regulator

5.1

Description

The TLD5098EL regulator is suitable for Boost, Buck, Buck-Boost, SEPIC and Flyback configurations. The

constant output current is especially useful for light emitting diode (LED) applications. The switching

regulator function is implemented by a pulse width modulated (PWM) current mode controller.

The PWM current mode controller uses the peak current through the external power switch and error in the

output current to determine the appropriate pulse width duty cycle (on time) for constant output current. The

current mode controller provides a PWM signal to an internal gate driver which then outputs to an external n-

channel enhancement mode metal oxide field effect transistor (MOSFET) power switch.

The current mode controller also has built-in slope compensation to prevent sub-harmonic oscillations which

is a characteristic of current mode controllers operating at high duty cycles (>50% duty).

An additional built-in feature is an integrated soft start that limits the current through the inductor and

external power switch during initialization. The soft start function gradually increases the inductor and switch

current over tSS (Parameter 5.2.9) to minimize potential overvoltage at the output.

Figure 5-1 Switching Regulator Block Diagram

Oscillator

FREQ/

SYNC

&

R

Q

S

OFF

when H

Q

Clock

>

1

Error -FF

L ow when

T

j > 175 °C

EA

FBH

COMP

H when

OVFB >1.25 V

Output Stage

OFF when

Low

NOR

&

NAND 2

&

R

Q

S

Q

PWM-FF

1

INV

Gate

Driver

Gate Driver

Supply

SWO

IVCC

Current

Sense

I

Soft start

V

Ref

0.3V

=

Slope Comp

t

FBL

x1

gmEA

VRef

1.25V

=

SGND

SWCS

Current

Comp

OVFB

IEA

ICS

High when

l EA -ISLOPE -ICS >0

VRef

4.0 V

=

High when

IVCC < 4.0V

UV IVCC

OV FB

SET

V

Ref

0

1

0 if SET < 1.6V

5

)

1

.

0

(

V

SET

−

9

8

6

7

10

11

1

2

4

3

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