TS19452CS-RLG datasheet, PDF - EEWORLD Datasheet

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TS19452CS-RLG: DescriptionLED Lighting Drivers AC-DC Wled driver; Categorysemiconductor Other integrated circuit (IC); File Size188KB，7 Pages; ManufacturerTaiwan Semiconductor; Websitehttp://www.taiwansemi.com/

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TS19452CS-RLG Overview

LED Lighting Drivers AC-DC Wled driver

TS19452CS-RLG Parametric

Parameter Name	Attribute value
Product Category	LED Lighting Drivers
Manufacturer	Taiwan Semiconductor
RoHS	Details
Package / Case	SOP-8
Packaging	Reel
Factory Pack Quantity	2500
Unit Weight	0.030018 oz

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TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

SOP-8

Pin assignment:

1. Drain

8. Ground

2. Drain

7. Ground

3. Drain

6. Ground

4. Vdd

5. Ground

General Description

The TS19452 is a PWM high efficiency LED driver control IC. It allows efficient operation of LED strings from

voltage source ranging up to 450VDC. It includes an internal high voltage switching MOSFET controlled with

fixed off-time of approximately 12µS.

The LED string is driven at constant current, thus providing constant light output and enhanced reliability. The

output current is internally fixed at 100mA. The peak current control scheme provides good regulation of the

output current throughout the universal AC line voltage range of 85~264VAC or DC input voltage of 20~400V

Features

●

Constant output current at 100mA(typ)

Universal 85~264VAC operation

Fixed off-time buck converter

Internal 475V power MOSFET

Low inductance value at 4.7mH (typ)

Typical Application Circuit

Application

●

Decorating LED lighting

LED lamps with AC or DC operation.

Ordering Information

Part No.

TS19452CS RLG

Package

SOP-8

Packing

2.5Kpcs / 13” Reel

Note:

“G” denote for Halogen Free Product

Absolute Maximum Rating

Parameter

Input Voltage Range

Supply Current

Power Dissipation @ T

=25ºC

Operating Ambient Temperature

Storage Temperature Range

Junction Temperature Range

Symbol

to GND

OPR

STG

Limit

~ +475

400

2500

-40 to +85

-65 to +150

-40 to +150

Unit

ºC

Thermal Resistance – Junction to Ambient

Rθ

C/W

Note:

Stresses beyond those listed under ”Absolute Maximum Ratings” may cause permanent damage to the

device. These are stress rating only, and functional operation of the device at these or any other conditions beyond

those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum

rating conditions for extended periods may affect device reliability.

1/7

Version: A12

TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

Function Description

The TS19452 is a PWM peak current controller for controlling a buck converter topology in continuous conduction

mode (CCM). The output current is internally preset at 100mA

When the input voltage of 20~400V appears at the Drain pin, the internal high-voltage linear regulator seeks to

maintain a voltage of 7.5VDC at the VDD pin. Until this voltage exceeds the internally programmed under-voltage

threshold, the output switching MOSFET is non-conductive. When the threshold is exceeded, the MOSFET turns

on. The input current begins to flow into the Drain pin. Hysteresis in provided in the under-voltage comparator to

prevent oscillation.

When the input current exceeds the internal preset level, a current sense comparator resets an RS flip-flop, and the

MOSFE turns off, At the same time, a one-shot circuit is activated that determines the duration of the off-state

(12µS typ.) As soon as this time is over, the flip-flop sets again. The new switching cycle begins.

A “blanking” delay of 300nS is provided that presents false triggering of the current sense comparator due to the

leading edge spike caused by circuit parasitic.

Application Information

The TS19452 is specifically designed for driving multi LED strings. It can be operated from either universal AC line

range of 85~264VAC or 20~400VDC, and drives up to tens of high brightness LEDs. All LEDs can be run in series

and this device regulates at constant current, yielding uniform illumination.

Selecting L1 and D1

There is a certain trade-off to be considered between optimal sizing of the output inductor L1 and the tolerated

output current ripple. The required value of L1 is inversely proportional to the ripple current

∆I

in it.

L1 = (V

x T

OFF

) /

∆I

is the forward voltage of the LED string. T

OFF

is the off-time of the TS19452. The output current in the LED string

) is calculated as:

= I

– (∆I

/ 2)

Where I

is the current sense comparator threshold. The ripple current introduces a peak-to-average error in the

output current setting that needs to be accounted for. Due to constant off-time control technique used in the

TS19452, the ripple current is independent of the input AC or DC line voltage variation. Therefore, the output

current will remain unaffected by the varying input voltage.

According a filter capacitor across the LED string can reduce the output current ripple even further, thus permitting

a reduced value of L1. However, one must keep in mind that the peak-to-average current error is affected by the

variation of T

OFF

. Therefore, the initial output current accuracy might be sacrificed at large ripple current in L1.

Another important aspect of designing an LED driver with TS19452 is related to certain parasitic elements of the

circuit, including distributed coil capacitance of L1, junction capacitance and reverse recover of the rectifier diode

D1, capacitance of the PCB traces C

PCB

and output capacitance C

DRAIN

of the controller itself. These parasitic

elements affect the efficiency of the switching converter and could potentially cause false triggering of the current

sense comparator if not properly managed. Minimizing these parasitic is essential for efficient and reliable

operation of the TS19452.

Coil capacitance of inductors is typically provided in the manufacturer’s data books either directly or in terms of the

self-resonant frequency (SRF).

SRF = 1 / (2π ·

√

(L · CL))

3/7

Version: A12

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