TS19375CSRLG [TSC]

PWM Step-Up Controller Oscillation frequency: 500kHz; PWM升压控制器振荡频率： 500kHz的


型号：	TS19375CSRLG
厂家：	TAIWAN SEMICONDUCTOR COMPANY, LTD
描述：	PWM Step-Up Controller Oscillation frequency: 500kHz PWM升压控制器振荡频率： 500kHz的控制器
文件：	总8页 (文件大小：144K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TS19375

PWM Step-Up Controller

SOP-8

Pin Definition:

1. EN

2. Vcc

3. FB

4. SS

8. NC

7. GND

6. Gate

5. Sense

General Description

The TS19375 is high efficient PWM step-up controller. Designed to drive an external N-channel MOSFET, Output

voltage is programmable with 1.0V of standard voltage supply internal, and using externally connected

components, output voltage (FB) can be set up at will.

The TS19375 can be operated at switching frequencies of 500kHz allowing for easy filtering and low noise, the

size of the external components can be reduced. An enable function and thermal shutdown functions are built

inside. The soft-start time can be programmed by outside capacitor; the function prevents overshoot at startup.

Features

Ordering Information

●

Input voltage range 3V ~ 24V

Part No.

Package

SOP-8

Packing

Output voltage: Define by N-CH MOSFET

Duty ratio: 0% ~ 85% PWM control

Oscillation frequency: 500kHz

TS19375CS RLG

2.5Kpcs / 13” Reel

Note: “G” denotes for Halogen Free

Soft-start time programmed by external capacitor Application

Thermal shutdown protection

●

LED Panel Display Backlighting

PDA and Portable Media Players

Local Boost Regulator

Internal current limit

External SW N-CH MOSFET

Typical Application Circuit

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Version: B11

TS19375

PWM Step-Up Controller

Absolute Maximum Rating

Characteristics

VCC Pin Voltage

Symbol

V_CC

Rating

VSS - 0.3 to VSS + 26

VSS - 0.3 to 12

VSS - 0.3 to VCC

Internally limited

-40 to +150

Unit

Feedback Pin Voltage

V_FB

EN Voltage

V_EN

SENSE Voltage

V_SENSE

V_SS

SS Pin Voltage

Gate Pin Voltage

V_GATE

P_D

Power Dissipation

ºC

Storage Temperature Range

Operating Junction Temperature Range

Operating Supply Voltage

Thermal Resistance from Junction to case

Thermal Resistance from Junction to ambient

T_STG

T_OPJ

V_OP

-20 to +125

+3 to +24

ºC/W

120

Note: Stresses exceed those rating may damage the device

Electrical Specifications (T_A=25^oC, V_IN=5V, V_OUT=12V unless otherwise noted)

Characteristics

Feedback Voltage

Quiescent Current

Feedback Bias Current

Shutdown Supply Current

Oscillation Frequency

Sense Voltage

Symbol

V_FB

Conditions

Min Typ Max Units

I_OUT=0.1A

0.975 1.000 1.025

KHz

I_CCQ

I_FB

V_FB=1.5V force driver off

I_OUT=0.1A

0.1

0.5

I_SD

V_EN=0V

F_OSC

V_SENSE

I_SS

SW pin

400

500

0.06

600

0.05

0.07

Soft Start Current

V_SS=0V

V_SH

High (regulator ON)

Low (regulator OFF)

V_EN=2.5V (ON)

V_EN=0.3V (OFF)

C_LX=1000pF

2.0

EN Pin Logic input threshold voltage

EN Pin Input Current

V_SL

0.8

I_SH

-1

I_SL

LX Rise Time

LX Fall Time

T_LXR

T_LXF

C_LX=1000pF

V_CC= 5V,

I_OUT= 1A

V_OUT= 12V

Efficiency

EFFI

Maximum Duty Cycle

Minimum Duty Cycle

Thermal shutdown Temp

DC_MAX

DC_MIN

TSD

V_FB=0V

°C

V_FB=1.5V

145

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Version: B11

TS19375

PWM Step-Up Controller

Block Diagram

Vcc

Phase

Compensation

Regulator

Vref=1.0V

Buffer

Driver

GATE

GND

PWM

Oscillator

Controller

8uA

Thermal

Shutdown

0.06V

SENSE

Pin Function Description

Pin NO. Pin Name

Pin Description

Shutdown Control Input

H: Normal Operation

L: Shutdown Mode

V_CC

VCC Supply pin

Feedback Pin

Soft-Start pin

V_SENSE

Gate

Current Limit Sense Voltage

Gate drive for external N-CH MOSFET

Signal Ground Pin

GND

Non Connect

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Version: B11

TS19375

PWM Step-Up Controller

Function Description

PWM Control

The TS19375 is high efficient PWM step-up controller, the pulse width varies in a range from 0 to 85%. According

to the load current, the ripple voltage produced by the switching can easily be removed through a filter because the

switching frequency remains constant. Therefore, TS19375 provide a low-ripple power over broad ranges of input

voltage and load current.

Setting the Output Voltage

Application circuit shows the basic application circuit with adjustable output version. The external resistor sets the

output voltage according to the following formula:

Table 1: Resistor select for output voltage setting

V_OUT

12V

15V

18V

24V

11K

21K

17K

30K

1.5K

1.3K

Current Limit Setting

The current limit threshold is setting by the external resistor (R_SENSE) connecting from SENSE pin to GND (refer the

application circuit). The internal current limit compared voltage is 60mV. When the SENSE voltage is larger than

60mV, an over-current condition is triggered. Please refer to the formula for setting the minimum current limit value:

Note: I_SW(MAX)is the maximum N-MOSFET current

Inductor Selection

For most designs, Low inductance values are physically smaller but require faster switching, which results in some

efficiency loss. The inductor value can be derived from the following formula:

Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor

ripple current approximately 15% of the maximum input current 3A, ∆IL=0.45A.

Table 2: Inductor select for output voltage setting (V_CC=5V)

V_OUT

12V

15V

18V

L1 Value

18uH

15uH

10uH

The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple

current to prevent core saturation (3A+0.25A).

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Version: B11

TS19375

PWM Step-Up Controller

Function Description (Continue)

Input Capacitor Selection

The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input

capacitor impedance at the switching frequency shall be less than input source impedance to prevent high

frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must

be used.

The capacitor voltage rating should be at least 1.5 times greater than the input voltage, and often much higher

voltage ratings are needed to satisfy.

Output Capacitor Selection

The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The

output capacitor must have low impedance at the switching frequency. A low ESR capacitor sized for maximum

RMS current must be used. The low ESR requirements needed for low output ripple voltage. The capacitor voltage

rating should be at least 1.5 times greater than the input voltage, and often much higher voltage ratings are needed

to satisfy.

The ESR range of output capacitor is 30m~100mΩ at switch current more than 1.5A. Add a 4.7uF output bypass

capacitor in order to reduce output ripple effectively

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Version: B11

TS19375

PWM Step-Up Controller

Electrical Characteristics Curve (T_A=25ºC, V_IN=5V, V_FORWARD-LED=3.3V, unless otherwise noted)

Input Voltage vs. Output Voltage

Output Current vs. Output Voltage

Shutdown Current vs. Temperature

Feedback Voltage vs. Temperature

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Version: B11

TS19375

PWM Step-Up Controller

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

= 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)

= Lot Code

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Version: B11

TS19375

PWM Step-Up Controller

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.

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Version: B11

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