Texas Instruments TPS61160ADRVR, TPS61161ADRVR Schematic [ru]

C1

38V MAX

VIN SW

FB

GND

CTRL

COMP

C2

20 mA

TPS61161A

ON/OFF

DIMMING

CONTROL

V 3 V to 18 V

I

L1

22 Hm

1 Fm

C3

220 nF

R

10

set

W

1 Fm

L1: TDK VLCF5020T-220MR75-1
C1: Murata GRM188R61E105K
C2: Murata GRM21BR71H105K
D1: ONsemi MBR0540T1

D1

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Folder

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SLVS937B –MARCH 2009–REVISED NOVEMBER2014

TPS6116xA White LED Driver with PWM Brightness Control in

2-mm x 2-mm WSON Package

1 Features 3 Description

1

• Input Voltage Range: 2.7 V to 18 V

• 26-V Open LED Protection for TPS61160A
38-V Open LED Protection for TPS61161A

• 200mV Reference Voltage With ±2% Accuracy

• PWM Interface for Brightness Control

• Built-in Soft Start

• Up to 90% Efficiency

• 2-mm × 2-mm × 0.8-mm 6-Pin WSON Package
With Thermal Pad

2 Applications

• Cellular Phones

• Portable Media Players

• Ultra Mobile Devices

• GPS Receivers

• White LED Backlighting for Media Form Factor
Display

With a 40-V rated integrated switch FET, the
TPS61160A/61A is a boost converter that drives
LEDs in series. The boost converter runs at 600-kHz
fixed switching frequency to reduce output ripple,
improve conversion efficiency, and allows for the use
of small external components.

The default white LED current is set with the external
sensor resistor Rset, and the feedback voltage is
regulated to 200 mV, as shown in the typical
application. During the operation, the LED current can
be controlled by a pulse width modulation (PWM)
signal applied to the CTRL pin through which the duty
cycle determines the feedback reference voltage. In
PWM dimming mode, the TPS61160A/61A does not
burst the LED current; therefore, it does not generate
audible noises on the output capacitor. For maximum
protection, the device features integrated open LED
protection that disables the TPS61160A/61A to
prevent the output from exceeding the absolute
maximum ratings during open LED conditions.

The TPS61160A/61A is available in a space-saving,
2-mm × 2-mm WSON package with thermal pad.

TPS61160A,TPS61161A

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

Device Information

PART NUMBER PACKAGE OPEN LED PROTECTION

TPS61160A TPS61160A use 26 V (typical)
TPS61161A TPS61161A use 38 V (typical)

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

WSON (6)

(1)

Typical Application of TPS61161A

TPS61160A,TPS61161A

SLVS937B –MARCH 2009–REVISED NOVEMBER 2014

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Table of Contents

1 Features.................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Pin Configuration and Functions......................... 3

6 Specifications......................................................... 3

6.1 Absolute Maximum Ratings ...................................... 3

6.2 Handling Ratings....................................................... 4

6.3 Recommended Operating Conditions....................... 4

6.4 Thermal Information.................................................. 4

6.5 Dissipation Ratings ................................................... 4

6.6 Electrical Characteristics........................................... 5

6.7 Typical Characteristics.............................................. 6

7 Detailed Description .............................................. 8

7.1 Overview ................................................................... 8

7.2 Functional Block Diagram......................................... 8

7.3 Feature Description................................................... 8

7.4 Device Functional Modes........................................ 10

8 Application and Implementation ........................ 11

8.1 Application Information............................................ 11

8.2 Typical Applications ................................................ 11

9 Power Supply Recommendations...................... 19

10 Layout................................................................... 20

10.1 Layout Guidelines ................................................. 20

10.2 Layout Example .................................................... 20

10.3 Thermal Considerations........................................ 20

11 Device and Documentation Support................. 21

11.1 Device Support...................................................... 21

11.2 Documentation Support ........................................ 21

11.3 Related Links ........................................................ 21

11.4 Trademarks........................................................... 21

11.5 Electrostatic Discharge Caution............................ 21

11.6 Glossary................................................................ 21

12 Mechanical, Packaging, and Orderable

Information........................................................... 21

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision A (July 2011) to Revision B Page

• Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application
and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and
Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section;

change "QFN" to "SON" ......................................................................................................................................................... 1

• Changed (reversed) the Vi=5V and Vi=3.6V characteristic labels in Figure 3....................................................................... 6

Changes from Original (March 2009) to Revision A Page

• Deleted "6 LEDs" and "10 LEDs" from the second feature bullet for TPS61160A and TPS61161A Open-LED

Protection, respectively........................................................................................................................................................... 1

• Deleted "for up to 10 LEDs in Series" from title ..................................................................................................................... 1

• Added "38V Max" to Typical Application of TPS61161A, top of LED string........................................................................... 1

• Changed from "...for driving up to 10 white LED" to "...for driving white LED" in first sentence of OPERATION section. .... 8

• Changed text of last sentence in "OPEN LED PROTECTION" section to clarify circuit description...................................... 9

• Changed Figure 11 to show separate terminals for COMP and FB..................................................................................... 10

• Changed Li-Ion Driver for 6 White LEDs With External PWM Dimming Network to clarify schematic................................ 14

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5 Pin Configuration and Functions

TPS61160A,TPS61161A

SLVS937B –MARCH 2009–REVISED NOVEMBER 2014

WSON (DRV) Package

6 Pins

Top View

Pin Functions

PIN

NAME NO.

COMP 2 O

CTRL 5 I
FB 1 I Feedback pin for current. Connect the sense resistor from FB to GND.

GND 3 O Ground
SW 4 I
VIN 6 I The input supply pin for the IC. Connect VIN to a supply voltage between 2.7 V and 18 V.
Thermal Pad

I/O DESCRIPTION

Output of the transconductance error amplifier. Connect an external capacitor to this pin to compensate the
regulator.

Control pin of the boost regulator. Enable and disable IC. PWM signal can be applied to the pin for LED
brightness dimming as well.

This is the switching node of the IC. Connect the inductor between the VIN and SW pin. This pin is also
used to sense the output voltage for open LED protection

The thermal pad should be soldered to the analog ground plane. If possible, use thermal via to connect to
ground plane for ideal power dissipation.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

Supply voltages on VIN

V

Voltages on CTRL

I

Voltage on FB and COMP

Voltage on SW
P
T

Continuous power dissipation See Dissipation Ratings

D

Operating junction temperature –40 150 °C

J

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating

Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) All voltage values are with respect to network ground terminal.

(2)

(2)

(2)

(2)

(1)

MIN MAX UNIT

–0.3 20 V
–0.3 20 V
–0.3 3 V
–0.3 40 V

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6.2 Handling Ratings

MIN MAX UNIT

T

V

Storage temperature range –65 150 °C

stg

Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all 4000

(1)

Electrostatic discharge V

(ESD)

pins
Charged device model (CDM), per JEDEC specification 1000

JESD22-C101, all pins

(2)

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

MIN MAX UNIT

V

I

V

O

L Inductor
f

dim

Duty

C

IN

C

O

T

A

T

J

(1) These values are recommended values that have been successfully tested in several applications. Other values may be acceptable in
(2) The device can support the frequency range from 1 kHz to 5 kHz, based on the specification, t

Input voltage, V

IN

Output voltage V

(1)

PWM dimming frequency

(2)

2.7 18 V

IN

10 22 μH

5 100 kHz

PWM duty cycle resolution 10 kHz 0.5%

30 kHz 1.5%
Input capacitor 1 μF
Output capacitor

(1)

0.47 10 μF
Operating ambient temperature –40 85 °C
Operating junction temperature –40 125 °C

other applications but should be fully tested by the user.

. The output ripple needs to be

considered in the range of 1 kHz to 5 kHz.

off

38 V

6.4 Thermal Information

TPS61160A,

THERMAL METRIC

(1)

TPS61161A

DRV

UNIT

6 PINS

R

θJA

R

θJC(top)

Junction-to-ambient thermal resistance 140
Junction-to-case (top) thermal resistance 20

°C/W

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Dissipation Ratings

BOARD PACKAGE R

(1)

Low-K

High-K

DRV 20°C/W 140°C/W 7.1 mW/°C 715 mW 395 mW 285 mW

(2)

DRV 20°C/W 65°C/W 15.4 mW/°C 1540 mW 845 mW 615 mW

θJC

R

θJA

(1) The JEDEC low-K (1s) board used to derive this data was a 3 in × 3 in, two-layer board with 2-ounce copper traces on top of the board.
(2) The JEDEC high-K (2s2p) board used to derive this data was a 3 in × 3 in, multilayer board with 1-ounce internal power and ground

planes and 2-ounce copper traces on top and bottom of the board.

DERATING FACTOR

ABOVE TA= 25°C

TA< 25°C TA= 70°C TA= 85°C

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6.6 Electrical Characteristics

VIN= 3.6 V, CTRL = VIN; for Min/Max values TA= –40°C to 85°C, typical values are at TA= 25°C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

SUPPLY CURRENT

V

I

I

Q

I

SD

UVLO Undervoltage lockout threshold VIN falling 2.2 2.5 V
V

hys

ENABLE AND REFERENCE CONTROL

V

(CTRLh)

V

(CTRLl)

R

(CTRL)

t

off

VOLTAGE AND CURRENT CONTROL

V

REF

V

(REF_PWM)

I

FB

f

S

D

max

t

min_on

I

sink

I

source

G

ea

R

ea

f

ea

POWER SWITCH

R

DS(on)

I

LN_NFET

OC and OLP

I

LIM

I

LIM_Start

t

Half_LIM

V

ovp

V

(FB_OVP)

t

REF

t

step

THERMAL SHUTDOWN

T

shutdown

T

hysteresis

Input voltage range, V

IN

Operating quiescent current into V

Device PWM switching no load 1.8 mA

IN

2.7 18 V

Shutdown current CRTL = GND, VIN= 4.2 V 1 μA

Undervoltage lockout hysteresis 70 mV

CTRL logic high voltage VIN= 2.7 V to 18 V 1.2 V
CTRL logic low voltage VIN= 2.7 V to 18 V 0.4 V
CTRL pull down resistor 400 800 1600 kΩ
CTRL pulse width to shutdown CTRL high to low 2.5 ms

Voltage feedback regulation voltage 196 200 204 mV
Voltage feedback regulation voltage VFB= 50 mV 47 50 53 mV

under brightness control

VFB= 20 mV 17 20 23
Voltage feedback input bias current VFB= 200 mV 2 μA
Oscillator frequency 500 600 700 kHz
Maximum duty cycle VFB= 100 mV 90% 93%
Minimum on pulse width 40 ns
Comp pin sink current 100 μA
Comp pin source current 100 μA
Error amplifier transconductance 240 320 400 μmho
Error amplifier output resistance 6 MΩ
Error amplifier crossover frequency 5 pF connected to COMP 500 kHz

N-channel MOSFET on-resistance VIN= 3.6 V 0.3 0.6

VIN= 3 V 0.7
N-channel leakage current VSW= 35 V, TA= 25°C 1 μA

N-Channel MOSFET current limit D = D
Start up current limit D = D

max

max

0.56 0.7 0.84 A

0.4 A
Time step for half current limit 5 ms
Open LED protection threshold Measured on the SW pin, 25 26 27 V

TPS61160A 37 38 39
TPS61161A

Open LED protection threshold on FB Measured on the FB pin, percentage

of Vref, 50%
Vref = 200 mV and 20 mV

V

filter time constant 180 μs

REF

V

ramp up time 213 μs

REF

Thermal shutdown threshold 160 °C
Thermal shutdown threshold hysteresis 15 °C

Ω

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40

50

60

70

80

90

100

0 10 20 30 40 50

10 LEDs - TPS61161A

V = 12 V

I

Output Current - mA

Efficiency - %

V = 5 V

I

V = 3.6 V

I

300

400

500

600

700

800

900

1000

20 30 40 50 60 70 80 90

DutyCycle-%

SwitchCurrentLimit-mA

40

50

60

70

80

90

100

0 10 20 30 40 50

OutputCurrent-mA

4(12.8V),6(19.2V)LEDs
8(25.6V),10(32V)LEDs

6LEDs

V =3.6V

I

4LEDs

8LEDs

10LEDs

Efficiency-%

40

50

60

70

80

90

100

0 10 20 30 40 50

6LEDs- TPS61160A

V =3.6V

I

V =3V

I

V =4.2V

I

OutputCurrent-mA

Efficiency-%

TPS61160A,TPS61161A

SLVS937B –MARCH 2009–REVISED NOVEMBER 2014

6.7 Typical Characteristics

Table 1. Table of Graphs

FIGURE

Efficiency TPS61160A/61A VIN= 3.6 V; 4, 6, 8, 10 LEDs; L = 22 μH Figure 1
Efficiency TPS61160A Figure 2
Efficiency TPS61161A Figure 3
Current limit TA= 25°C Figure 4
Current limit Figure 5
PWM dimming linearity VIN= 3.6 V; PWM Freq = 10 kHz and 40 kHz Figure 6
Output ripple at PWM dimming 8 LEDs; VIN= 3.6 V; I
Switching waveform 8 LEDs; VIN= 3.6 V; I
Start-up 8 LEDs; VIN= 3.6 V; I
Open LED protection 8 LEDs; VIN= 3.6 V; I

= 20 mA; PWM Freq = 10 kHz Figure 7

LOAD

= 20 mA; L = 22 μH Figure 8

LOAD

= 20 mA; L =22 μH Figure 9

LOAD

= 20 mA; L = 22 μH Figure 10

LOAD

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Figure 1. Efficiency vs Output Current

Figure 3. Efficiency vs Output Current Figure 4. Switch Current Limit vs Duty Cycle

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Figure 2. Efficiency vs Output Current

Product Folder Links: TPS61160A TPS61161A

t-2ms/div

CTRL
5V/div

VOUT

10V/div

COMP

500mV/div

I
200mA/div

L

t-100 s/divm

OPENLED
5V/div

FB
200mV/div

VOUT

10V/div

I
200mA/div

L

t-100 s/divm

PWM2V/div

VOUT 20mV/div AC

I 10mA/div

LED

t-1 s/divm

SW
20V/div

VOUT
20mV/div
AC

I
200mA/div

L

0

40

80

120

160

200

0 20 40 60 80 100

PWMDutyCycle-%

10kHz,40kHz

FBVoltage-mV

300

400

500

600

700

800

900

1000

-40 -20 0 20 40 60 80 100 120 140

Temperature- C°

SwitchCurrentLimit-mA

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TPS61160A,TPS61161A

SLVS937B –MARCH 2009–REVISED NOVEMBER 2014

Figure 5. Switch Current Limit vs Temperature

Figure 7. Output Ripple at PWM Dimming

Figure 6. FB Voltage vs PWM Duty Cycle

Figure 8. Switching Waveform

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Figure 9. Start-Up

Figure 10. Open LED Protection

Product Folder Links: TPS61160A TPS61161A

SW

Ramp

Generator

Oscillator

Current
Sensor

OLP

CTRL

GND

C3

L1

+

FB

Reference

Control

D1

Error

Amplifer

2

1

Rset

C2

Vin

C1

PWM Control

4

6

Soft

Start-up

5

3

COMP

TPS61160A,TPS61161A

SLVS937B –MARCH 2009–REVISED NOVEMBER 2014

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7 Detailed Description

7.1 Overview

The TPS61160A/61A is a high-efficiency, high output voltage boost converter in small package size that is ideal
for driving white LED in series. The serial LED connection provides even illumination by sourcing the same
output current through all LEDs, eliminating the need for expensive factory calibration. The device integrates 40­V/0.7-A switch FET and operates in pulse width modulation (PWM) with 600-kHz fixed switching frequency. For
operation see the block diagram. The duty cycle of the converter is set by the error amplifier output and the
current signal applied to the PWM control comparator. The control architecture is based on traditional current­mode control; therefore, a slope compensation is added to the current signal to allow stable operation for duty
cycles larger than 50%. The feedback loop regulates the FB pin to a low reference voltage (200 mV typical),
reducing the power dissipation in the current sense resistor.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Soft Start-Up

Soft-start circuitry is integrated into the IC to avoid a high inrush current during start-up. After the device is
enabled, the voltage at FB pin ramps up to the reference voltage in 32 steps, each step takes 213 μs. This
ensures that the output voltage rises slowly to reduce the input current. Additionally, for the first 5 msec after the
COMP voltage ramps, the current limit of the switch is set to half of the normal current limit spec. During this
period, the input current is kept below 400 mA (typical). See the start-up waveform of a typical example,

Figure 9.

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V Duty 200 mV

u

FB

LED

SET

V

R

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SLVS937B –MARCH 2009–REVISED NOVEMBER 2014

Feature Description (continued)

7.3.2 Open LED Protection

Open LED protection circuitry prevents IC damage as the result of white LED disconnection. The
TPS61160A/61A monitors the voltage at the SW pin and FB pin during each switching cycle. The circuitry turns
off the switch FET and shuts down the IC when both of the following conditions persist for 8 switching clock
cycles: (1) the SW voltage exceeds the V
voltage. As a result, the output voltage falls to the level of the input supply. The device remains in shutdown
mode until it is enabled by toggling the CTRL pin logic. To allow the use of inexpensive low-voltage output
capacitor, the TPS61160A/61A has different open lamp protection thresholds. The threshold is set at 26 V for the
TPS61160A and 38 V for the TPS61161A. Select the appropriate device so that the product of the number of
external LEDs and each LED's maximum forward voltage plus the 200 mV reference voltage does not exceed
the minimum OVP threshold or (n

LEDS

X V

7.3.3 Shutdown

The TPS61160A/61A enters shutdown mode when the CTRL voltage is logic low for more than 2.5 ms. During
shutdown, the input supply current for the device is less than 1 μA (max). Although the internal FET does not
switch in shutdown, there is still a DC current path between the input and the LEDs through the inductor and
Schottky diode. The minimum forward voltage of the LED array must exceed the maximum input voltage to
ensure that the LEDs remain off in shutdown; however, in the typical application with two or more LEDs, the
forward voltage is large enough to reverse bias the Schottky and keep leakage current low.

7.3.4 Current Program

The FB voltage is regulated by a low 0.2-V reference voltage. The LED current is programmed externally using a
current-sense resistor in series with the LED string. The value of the RSET is calculated using Equation 1:

threshold and (2) the FB voltage is less than half of regulation

OVP

LED(MAX)

) + 200 mV ≤ V

OVP(MIN).

where

• I

• VFB= regulated voltage of FB

• R

= output current of LEDs

LED

= current sense resistor (1)

SET

The output current tolerance depends on the FB accuracy and the current sensor resistor accuracy.

7.3.5 PWM Brightness Dimming

When the CTRL pin is constantly high, the FB voltage is regulated to 200 mV typically. However, the CTRL pin
allows a PWM signal to reduce this regulation voltage; therefore, it achieves LED brightness dimming. The
relationship between the duty cycle and FB voltage is given by Equation 2.

where

• Duty = duty cycle of the PWM signal

• 200 mV = internal reference voltage (2)

As shown in Figure 11, the IC chops up the internal 200-mV reference voltage at the duty cycle of the PWM
signal. The pulse signal is then filtered by an internal low pass filter. The output of the filter is connected to the
error amplifier as the reference voltage for the FB pin regulation. Therefore, although a PWM signal is used for
brightness dimming, only the WLED DC current is modulated, which is often referred as analog dimming. This
eliminates the audible noise which often occurs when the LED current is pulsed in replica of the frequency and
duty cycle of PWM control. Unlike other scheme which filters the PWM signal for analog dimming,
TPS61160A/61A regulation voltage is independent of the PWM logic voltage level which often has large
variations.

For optimum performance, use the PWM dimming frequency in the range of 5 kHz to 100 kHz. The requirement
of minimum dimming frequency comes from the output ripple. Low frequency causes high output ripple. Since the
CTRL pin is logic only pin, applying an external RC filter to the pin does not work.

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