TS1916CX6RFG [TSC]

1.7A Boost WLED Driver;


型号：	TS1916CX6RFG
厂家：	TAIWAN SEMICONDUCTOR COMPANY, LTD
描述：	1.7A Boost WLED Driver
文件：	总10页 (文件大小：875K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TS1916

1.7A Boost WLED Driver

Pin Definition:

1. Switch

2. Ground

3. Feedback

4. Enable

5. OVP

SOT-26

6. V_CC

General Description

The TS1916 is a step-up (Boost) converter designed for driving up to 10 series white LEDs for backlighting

application. The TS1916 uses current mode, 1MHz fixed frequency architecture to regulate the LED current,

which is set through an external current sense resistor. It’s low feedback voltage reduces power loss and

improves efficiency. The OVP pin monitors the output voltage and turns off the converter if an over-voltage

condition is present due to an open circuit condition. The TS1916 includes under-voltage lockout, current limiting

and thermal shutdown protection preventing damage in the event of an output overload.

Features

Application

●

2.5V to 5.5V operating input voltage range

●

Digital Still Cameras

Drives up to 10 series white LEDs

1MHz fixed switching frequency

Wide range for PWM dimming (200Hz to 200kHz)

Internal 1.7A switching current limit

Over voltage protection (OVP)

Portable Electronics

PDAs and Palm-Top Computers

Local Boost Regulator

Internal soft-start function

Current limit and thermal shutdown protection

Under voltage lockout

Ordering Information

Part No.

TS1916CX6 RFG

Package

SOT-26

Packing

3kpcs / 7” Reel

Note: “G” denotes for Halogen- and Antimony-free as those which

contain <900ppm bromine, <900ppm chlorine (<1500ppm

total Br + Cl) and <1000ppm antimony compounds

Absolute Maximum Ratings

Parameter

Symbol

Limit

-0.3 to 6

-0.3 to 45

-0.3 to 6

( T_J-T_A) / R_θJA

-65 to +150

-40 to +125

Unit

V_CCPin Voltage

V_CC

V_SW

V_OVP

SW Pin Voltage

OVP Pin Voltage

EN, FB Pin Voltage

Power Dissipation

P_D

°C

Storage Temperature Range

Operating Junction Temperature Range

Thermal Resistance from junction to case

T_STG

T_OP

R_θJC

°C/W

R_θJA

Thermal Resistance from junction to ambient

Note: R_θJAis measured with the PCB copper area of approximately 1 in²(Multi-layer).

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1.7A Boost WLED Driver

Electrical Specifications (T_A=25^oC, V_IN=5V, I_OUT=20mA unless otherwise noted)

Characteristics

Symbol

V_CC

Conditions

Min

2.5

Typ Max Units

Input Voltage Range

Step-Up Voltage Range

OVP Sense Voltage

Under Voltage Lockout

UVLO Hysteresis

5.5

V_OUT

V_OVP

2.2

100

200

U_VLO

Rising

2.4

Feedback Voltage

V_FB

V_IH

V_IL

190

2.0

210

Logic-High Voltage

Logic-Low Voltage

EN Threshold

EN Hysteresis

0.4

200

300

μA

Operating Quiescent Current

Shutdown Current

N-Channel MOSFET Current Limit ^(Note)

MOSFET On-Resistance ^(Note)

Maximum Duty Cycle

I_CCQ

I_SD

I_OUT= 0mA, V_FB=0.5V

V_EN=0V, t_EN> 20ms

Duty=50%

500

I_LIM

1.7

0.6

R_DS(on)

D_MAX

1.0

Line Regulation

V_CC= 3V to 5V

Switching Frequency

f_OSC

f_DIM

I_FB-LKGV_FB= 0.5V

0.75

0.2

1.25

200

100

MHz

kHz

µA

μA

Dimming Clock Rate

FB Input Leakage Current

SW Leakage Current

0.01

I_SWL

V_LX= 30V, V_FB=0.5V

I_EN-LKG1V_EN= V_CC

1.5

EN Input Leakage Current

I_EN-LKG2V_EN= GND

Shutdown Delay

t_SHDN

T_SD

160

Thermal Shutdown

°C

Thermal Shutdown Hysteresis

Note: Guaranteed by design

T_SH

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1.7A Boost WLED Driver

Block Diagram

VCC

UVLO

Enable

Logic

Soft Start

10ms

OVP

Reference

1.238V

Shutdown

Thermal

Shutdown

Summing

Comparator

300mV

Control and

Driver Logic

Error Amplifier

N-MOS

Oscillator

1MHz

GND

Current

Sense

Slope

Compensation

Pin Description

Pin Number

Pin Name

Description

GND

Switch Output Pin

Ground Pin

Feedback Pin; Put a Resistor to GND to Setting the Current

Enable with Dimming Pin; Internal Pull-Low; Logic High Active

OVP

V_CC

OVP Sense Pin

Power Input Pin

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1.7A Boost WLED Driver

Application Circuit

For 10 series LED Application with Dimming

I_LED=V_FB/R3, V_FB=200mV

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1.7A Boost WLED Driver

Application Information

Setting the ILED Current

Application circuit item shows the basic application circuit with TS1916 adjustable output version. The external

resistor sets the LED output current according to the following equation:

I_{LED =}( V_FB/ R3 )

Part No.

I_LED

20mA

350mA

10Ω

0.571Ω

4mW

70mW

TS1916

Over Voltage Protection

The Over Voltage Protection is detected by a junction breakdown detecting circuit. Once V_OUTgoes over the

detecting voltage, SW pin stops switching and the power N-MOSFET will be turned off. Then, the V_OUTwill be

clamped to be near V_OVP

Under Voltage Lockout (UVLO)

To avoid mis-operation of the device at low input voltages an under voltage lockout is included that disables the

device, if the input voltage falls below (2.25V-100mV).

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. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and

small temperature coefficients. A 4.7µF ceramic capacitor for most applications is sufficient. For a lower output

power requirement application, this value can be decreased.

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. Ceramic capacitors with X5R or X7R

dielectrics are recommended due to their low ESR and high ripple current. A 1µF ceramic capacitors works for most

of the applications. Higher capacitor values can be used to improve the load transient response.

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1.7A Boost WLED Driver

Electrical Characteristics Curve

Figure 2. Power On from EN

Figure 1. Power On from V_IN

Figure 3. Steady State Operation

Figure 4. Normal Operation Into OVP

Figure 5. PWM Dimming From EN (200Hz)

Figure 6. PWM Dimming From EN (20Hz)

V_IN=5V, 4WLEDs, I_OUT=150mA

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1.7A Boost WLED Driver

Electrical Characteristics Curve

Figure 7. Reference Voltage vs. Input Voltage

Figure 8. Reference Voltage vs. Temperature

Figure 10. Output Voltage vs. Output Current

Figure 12. Frequency vs. Temperature

Figure 9. Quiescent Current vs. Input Voltage

Figure 11. LED Current vs. Duty

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1.7A Boost WLED Driver

Electrical Characteristics Curve

Figure 13. Frequency vs. Input Voltage

Figure 14. Enable Voltage vs. Input Voltage

Figure 15. Efficiency vs. Output Current

Figure 16. Efficiency vs. Input Voltage

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1.7A Boost WLED Driver

SOT-26 Mechanical Drawing

Unit: Millimeters

Marking Diagram

JC = Device Code

Y = Year Code

(4=2014, 5=2015, 6=2016, 7=2017, 8=2018, 9=2019…)

W = Week: 01~26 (A~Z)

27~52 (a~z)

X = Internal Code

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1.7A Boost WLED Driver

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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