TS2509_13 [TSC]

3A / 500KHz PWM Buck Converter; 3A / 500KHz的PWM降压转换器


型号：	TS2509_13
厂家：	TAIWAN SEMICONDUCTOR COMPANY, LTD
描述：	3A / 500KHz PWM Buck Converter 3A / 500KHz的PWM降压转换器转换器
文件：	总9页 (文件大小：502K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TS2509

3A / 500KHz PWM Buck Converter

SOP-8

Pin Definition:

1. FB

8. Vss

2. EN

3. Comp

4. Vcc

7. Vss

6. SW

5. SW

General Description

TS2509 is step-down switching regulator with PWM control and with build in internal PMOS. TS2509 provides low-

ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit can be duty ratio linearly

form 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents

overshoot at startup.

An enable, over current protect and short circuit protect functions are built inside. When OCP or SCP activated, the

operation frequency will be reduced. The internal compensation block is built in to minimum external components and

internal PMOS is complete 3A step down switching regulator ideally for portable devices with outstanding features as

low current consumption.

Features

Ordering Information

●

Input Voltage: 3.6V~23V

Part No.

Package

SOP-8

Packing

Output Voltage: 0.8V~Vcc

TS2509CS RL

2.5Kpcs / 13” Reel

Duty Ratio: 0%~100% PWM Control

Oscillation Frequency: 500kHz typ.

Soft-Start (SS), Current Limit (CL), Enable Function

Thermal Shutdown Function

Application

●

Simple High-efficiency Step down Regulator

On-Card Switching Regulators

Short Circuit Protect (SCP)

●

Internal SW P-Channel MOSFET

Low ESR output capacitor (MLCC application)

Absolute Maximum Rating

Parameter

Symbol

V_CC

V_FB

Rating

V_SS- 0.3 to V_SS+ 25

V_SS- 0.3 to V_CC

V_SS- 0.3 to V_CC+ 0.3

Internally limited

-40 to +150

Unit

VCC Pin Voltage

Feedback Pin Voltage

ON/OFF Pin Voltage

V_EN

Switch Pin Voltage

V_SW

P_D

Power Dissipation

℃

Storage Temperature Range

Operating Temperature Range

Operating Supply Voltage

Thermal Resistance from Junction to case

Thermal Resistance from Junction to ambient

T_{ST G}

T_OP

-20 to +125

℃

V_OP

θ_JC

+3.6 to +23

℃/W

θ_JA

1/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

Electrical Specifications (V_IN=12V, Ta=25^oC unless otherwise noted)

Characteristics

Symbol

Conditions

I_OUT=0.1A

Min

Typ

Max

Units

Feedback Voltage

Quiescent Current

Feedback Bias Current

Shutdown Supply Current

Current limit

V_FB

0.784

0.800

0.816

I_q

V_FB=1.2V force driver off

I_OUT=0.1A

I_FB

I_SD

0.1

0.5

V_EN=0V

I_SW

Line Regulation

∆V_OUT/V_OUT

F_OSC

V_SH

V_CC= 5V~23V, I_OUT=0.2A

I_OUT= 0.1 to 3A

0.6

0.2

500

1.2

0.4

600

Load Regulation

Oscillation Frequency

EN Pin Logic input

threshold voltage

SW pin

400

2.0

KHz

High (regulator ON)

Low (regulator OFF)

V_EN=2.5V (ON)

V_SL

0.8

I_SH

-10

EN Pin Input Current

Soft-Start Time

I_SL

V_EN=0.3V (OFF)

T_SS

0.3

V_CC= 5V, V_FB=0V

V_CC= 12V, V_FB=0V

125

140

Internal MOSFET

R_DSON

mΩ

I_OUT= 2A

V_OUT= 5V

Efficiency

E_FFI

T_SD

I_OUT= 3A

Thermal Shutdown Temp.

ºC

Block Diagram

ꢀ

Pin Assignment

Name

Description

Feedback pin

H: Normal operation (Step-down)

L: Step-down operation stopped (All circuit deactivated)

Compensation pin

Switch pin. Connect external inductor/diode here

IC power supply pin

Comp

Vcc

Vss

Gnd pin

2/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

Application Circuit

MLCC

Compensation Capacitor Selection (MLCC)

VIN

VOUT

5.0/3.3/2.5V

1.8/1.5V

2.2K

1nF

7~23V

7~20V

9~20V

9~18V

4~10V

15uH

10uH

15uH

10uH

330pF

560pF

330pF

1nF

1.2V

820pF

680pF

1nF

1.1V

1.0V

3.3/2.5V

6.8K

4.7K

1.8/1.5/1.2/ 1.1/1.0V

1nF

EL CAP

Compensation Capacitor Selection (EL CAP)

VIN

VOUT

7-20V

5.0/3.3/2.5/1.8V

Coil

3.9K

10nF

1nF

7-20V

5-7V

5-20V

1.8/1.5V

3.3/2.5/1.8/1.5/1.2V

Coil

SMD

0.82K

10nF

1nF

3/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

Function Descriptions

PWM Control

The TS2509 is a pulse-width modulation (PWM) system with a range from 0 to 100% according to different load

current. The ripple voltage produced by the switching can easily be removed through a filter because the switching

frequency remains constant.

Setting the Output Voltage

TS2509 is adjustable output version. With different output voltage setting, following tables are for external resistor

value setting as reference:

(EL CAP) Resistor select for output voltage setting

(MLCC) Resistor select for output voltage setting

V_OUT

1.3K

1.5K

2.2K

V_OUT

7.5K

15K

22K

27K

30K

56K

6.8K

4.7K

2.5K

39K

47K

33K

27K

15K

13K

3.3V

2.5V

1.8V

1.5V

1.2V

3.3V

2.5V

1.8V

1.5V

1.2V

2.2K

1.5K

2.5K

10K

Inductor Selectionꢀ

For most designs are operates with inductors of 10µH to 22µH. The inductor value can be derived from the following

table:

L1 Recommend Value (V_IN=12V, I_OUT=3A)

V_OUT

1.8V

2.5V

3.3V

L1 Value

10~15uH

15~22uH

Large value inductors can lower ripple current and small value inductors will gets higher ripple currents. Choose

inductor ripple current approximately 15% of the maximum load current 3A.ꢀ

Input Capacitor Selection

(EL CAP)

This capacitor should be located close to the IC using short leads and the voltage rating should be approximately 1.5

times the maximum input voltage. The RMS current rating should be approximately 1⁄2 the DC load current. A low ESR

input capacitor sized for maximum RMS current must be used. A 220µF low ESR capacitor for most sufficient for

applications

(MLCC)

A 22µF MLCC or two 10uF MLCC capacitors for most sufficient for applications

4/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

Function Descriptions (Continue)

Output Capacitor Selection

(EL CAP)

The output capacitor is required to maintain the DC output voltage stability. The important capacitor parameters are;

the 100KHz ESR (Equivalent Series Resistance), the RMS ripples current rating, voltage rating, and capacitance

value. For the output capacitor, the ESR value is the most important parameter, the ESR can be calculated from the

following formula.

V_RIPPLE= ∆I_Lx ESR = 0.4A x 110mΩ = 44mV

An aluminum electrolytic capacitor's ESR value is related to the capacitance and its voltage rating. In most case, higher

voltage electrolytic capacitors have lower ESR values. Most of the time, capacitors with much higher voltage ratings

may be needed to provide the low ESR values required for low output ripple voltage. It is recommended to replace this

low ESR capacitor by using a 330µF low ESR values < 110mΩ

(MLCC)

A 33µF MLCC or three 10uF MLCC capacitors is most sufficient for applications.

_DS(ON)Current Limiting

The current limit threshold is setting by the internal circuit.

V_IN

4.6V~6V

6V~10V

3.8A

10V~23V

4.0A

I_CL(MIN)

I_OUT(MAX)

2.5A

Layout Guidance

When laying out the PC board, the following suggestions should be taken to ensure proper operation of the TS2509.

1. The power traces, including the PMOS Drain & Source trace, the Schottky and the C2 trace should be kept short,

direct and wide to allow large current flow.

2. Connect the C5 to the V_CC& EN pins of the TS2509 as closely as possible to get good power filter effect.

3. Keep the switching node, away from the sensitive FB node.

4. Connect ground side of the C2 & D1 as closely as possible.

5. Connect PMOS Source and R3 as closely as possible.

6. Do not trace signal line under inductor.

5/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

Electrical Characteristics Curve

Figure 1. Feedback Voltage vs. Input Voltage

Figure 2.Quiescent Current vs. Input Voltage

Figure 3. Frequency vs. Input Voltage

Figure 4. Frequency vs. Temperature

Figure 5. Feedback Voltage vs. Temperature

Figure 6. Quiescent Current vs. Temperature

6/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

Electrical Characteristics Curve

Figure 8.Output Ripple (V_IN=12V, V_OUT=5V, I_OUT=3A)

Figure 7. Efficiency

(V_IN=12V, V_OUT=5V, I_OUT=0.2A)

(V_IN=12V, V_OUT=5V, I_OUT=3A)

Figure 10.Power On test Wave

Figure 9.Power On test Wave

(V_IN=12V, V_OUT=5V, I_OUT=0.1~3A)

Figure 11. Load Transient Response

7/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

SOP-8 Mechanical Drawing

SOP-8 DIMENSION

MILLIMETERS

INCHES

MIN

DIM

MIN

4.80

3.80

1.35

0.35

0.40

MAX

5.00

4.00

1.75

0.49

1.25

MAX.

0.196

0.157

0.068

0.019

0.049

0.189

0.150

0.054

0.014

0.016

1.27BSC

0.05BSC

0.10

0º

0.25

7º

0.004

0º

0.009

7º

5.80

0.25

6.20

0.50

0.229

0.010

0.244

0.019

Marking Diagram

Y = Year Code

M = Month Code

(A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug, I=Sep,

J=Oct, K=Nov, L=Dec)

= Lot Code

8/9

Version: B09

TS2509

3A / 500KHz PWM Buck Converter

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.

9/9

Version: B09

TS2509_13 [TSC]

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