TS19452CS-RLG [TSC]

AC/DC WLED Driver with Internal MOSFET; AC / DC WLED驱动器，带有内部MOSFET


型号：	TS19452CS-RLG
厂家：	TAIWAN SEMICONDUCTOR COMPANY, LTD
描述：	AC/DC WLED Driver with Internal MOSFET AC / DC WLED驱动器，带有内部MOSFET 驱动器
文件：	总7页 (文件大小：203K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

SOP-8

Pin assignment:

1. Drain

8. Ground

2. Drain

7. Ground

6. Ground

5. Ground

3. Drain

4. Vdd

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

Typical Application Circuit

●

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)

Application

●

Decorating LED lighting

●

LED lamps with AC or DC operation.

Ordering Information

Part No.

Package

Packing

TS19452CS RLG

SOP-8

2.5Kpcs / 13” Reel

Note: “G” denote for Halogen Free Product

Absolute Maximum Rating

Parameter

Symbol

V_INto GND

I_DD

Limit

~ +475

400

Unit

Input Voltage Range

Supply Current

Power Dissipation @ T_A=25ºC

Operating Ambient Temperature

Storage Temperature Range

Junction Temperature Range

Thermal Resistance – Junction to Ambient

P_D

2500

ºC

^oC

^oC/W

T_OPR

-40 to +85

-65 to +150

-40 to +150

T_STG

T_J

Rθ

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.

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Version: A12

TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

Electrical Specifications (Ta = 25^oC, V_DRAIN= 50V, unless otherwise noted)

Function Parameter

Internal Regulator

Symbol

Test Conditions

Min Typ Max Units

Internally Regulated Voltage

Drain Supply Voltage

Undervoltage Lockout Threshold

Undervoltage Lockout Hysteresis

Supply Current

V_DD

V_DRAIN

UVLO

∆UVLO

I_DD

7.5

450

V_DDrising

V_DDfalling

200

µA

V_DD(EXT)=8.5V, V_DRAIN=40V

400

Output (Drain)

Breakdown Voltage

V_BR

R_DSON

C_DRAIN

I_SAT

Note 1

550

Ω

On Resistance

I_DRAIN=100mA

V_DRAIN=400V

100

5.0

120

Output Capacitance

1.0

MOSFET Saturation current

Current Sense Comparator

Threshold Current

I_TH

Note 1

200

300

110

400

650

Leading edge Blanking delay

Minimum Turn On-Time

Off-Time Generator

Turn On-Time

T_BLANK

T_ON(MIN)

Note 1,2

T_OFF

µS

Note 1: The specification which apply over the full operating ambient temperature range of -40ºC<T_A<+85ºC

2: Guaranteed by design

Block Diagram

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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_Oin it.

L1 = (V_Ox T_OFF) / ∆I_O

V_Ois the forward voltage of the LED string. T_OFFis the off-time of the TS19452. The output current in the LED string

(I_O) is calculated as:

I_O= I_H– (∆I_O/ 2)

Where I_THis 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_PCBand output capacitance C_DRAINof 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))

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Version: A12

TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

Application Information (Continue)

Where L is the inductance value, and C_Lis the coil capacitance. Charging and discharging this capacitance every

switching cycle causes high-current spikes in the LED string. Therefore, connecting a small capacitor C_O(~100nF)

is recommended to bypass these spikes.

Using an ultra-fast rectifier diode for D1 is recommended to achieve high efficiency and reduce the risk of false

triggering of the current sense comparator. Using diodes with shorter reverse recovery time t_rrand lower junction

capacitance C_Jachieves better performance. The reverse voltage rating V_Rof the diode must be greater than the

maximum input voltage of LED lamps.

The total parasitic capacitance present at the Drain pin of the TS19452 can be calculated as:

C_P= C_DRAIN+ C_PCB+ CL + C_J

When the switching MOSFET turns on, the capacitance C_Pis discharged into the Drain pin of the IC. The discharge

current is limited to about 150mA typically. However, it may become lower at increased junction temperature. The

duration of the leading edge current spike can be estimated as:

T_PSIKE= ((V_INx C_P) / (I_SAT)) + t_r

EMI Filter

As with all off-line converters, selecting an input filter is critical to obtaining good EMI. A switching side capacitor,

albeit of small value, is necessary in order to ensure low impedance to the high frequency switching currents of the

converter. As a rule of thumb, this capacitor should be approximately 0.1~0.2µF/W of LED output power.

4/7

Version: A12

TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

Electrical Characteristics Curve

Figure 1. Switch-Off Transition

Ch1: V_DRAIN, Ch3: I_DRAIN

Figure 2. Switch-On Transition

Ch1: V_DRAIN, Ch3: I_DRAIN

Figure 3. Lead Edge Spike

Ch1: V_DRAIN, Ch3: I_DRAIN

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Version: A12

TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

SOP-8 Mechanical Drawing

Unit: Millimeters

Marking Diagram

Y = Year Code

M = Month Code for Halogen Free Product

(O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep,

X=Oct, Y=Nov, Z=Dec)

L = Lot Code

6/7

Version: A12

TS19452

AC/DC WLED Driver with Internal MOSFET

Universal Switch Mode

Notice

Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,

assumes no responsibility or liability for any errors or inaccuracies.

Information contained herein is intended to provide a product description only. No license, express or implied, to

any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of

sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty,

relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose,

merchantability, or infringement of any patent, copyright, or other intellectual property right.

The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.

Customers using or selling these products for use in such applications do so at their own risk and agree to fully

indemnify TSC for any damages resulting from such improper use or sale.

7/7

Version: A12

TS19452CS-RLG [TSC]

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