ILD4180XUMA1_技术文档

Datasheet, Rev. 1.1, January 2011

ILD4180

1.8A DC/DC Step-Down Converter

LED Driver for Industrial Applications

1.8A DC/DC Step-Down Converter

ILD4180

1

Overview

•

Wide Input Voltage Range from 4.75V to 45V

Constant Current or Constant Voltage Regulation

Drives LEDs in Buck Topology

Very low shutdown current consumption (typ. 100nA)

370 kHz switching frequency

PWM Dimming

Integrated power-switch (output current up to 1.8A)

Internal Soft-Start function

± 2% output current tolerance (± 4% for full load current range)

Small thermally enhanced exposed heatslug package

Over Temperature Shutdown

Suited for industrial applications: Tj = -40 °C to +125 °C

Green Product (RoHS Compliant)

PG-DSO-8-27

Description

The ILD4180 is a smart LED buck converter with an integrated power-switch, capable of driving up to 1.8A load

current with excellent line and load regulation. The main function of this device is to step-down the input voltage

and regulating a constant LED current. The constant current regulation is especially beneficial for LED color

accuracy and longer lifetime. The ILD4180 also has a PWM input which can be used for LED dimming. The

switching frequency of 370kHz allows to use small and inexpensive passive components. An Enable function is

implemented to reduce the shut-down current consumption to typ. 100nA. This IC provides protection functions

such as current limitation and overtemperature shutdown. The integrated soft-start feature avoids a current and

voltage overshot at the output during start-up of the device.

Applications

•

LED Controller for industrial applications

Universal Constant Current and Voltage Source

General Illumination e.g. Halogen Replacement

Residential Architectural and Industrial Commercial Lighting for in- and outdoor

Signal and Marker Lights for Orientation or Navigation (e.g. steps, exit ways, etc.)

For automotive and transportation applications, please refer to the Infineon® Auto LED products.

Type

Package

Marking

ILD4180

PG-DSO-8-27

ILD4180

Datasheet

2

Rev. 1.1, 20011-01-25

ILD4180

Block Diagram

2

Block Diagram

EN

VS

7

8

Enable

Charge Pump

Over

Temperature

Shutdown

BDS

BUO

FB

5

Feedforward

COMP

3

Buck

Converter

6

4

PWMI

1

Oscillator

Bandgap

Reference

Soft start ramp

generator

ILD5085

ILD4180

2

GND

Figure 1

Block Diagram

Datasheet

3

Rev. 1.1, 20011-01-25

ILD4180

Pin Configuration

3

Pin Configuration

3.1

Pin Assignment

ILD4180

ILD5085

PWMI

GND

COMP

FB

1

2

3

4

8

7

6

5

VS

EN

BUO

BDS

EP

S08_Pinout_ILD5085 .vsd

Figure 2

Pin Configuration

3.2

Pin Definitions and Functions

Pin Symbol Function

1

2

3

PWMI

PWM Input for;

Provides LED dimming option. If not used connect to VS.

GND

Ground;

Connect to system ground.

Compensation Input;

COMP

Frequency compensation for regulation loop stability.

Connect R and C network to pin for stability.

4

FB

Feedback Input;

Connect a defined power resistor (RFB=0.6V/ILED) to get the needed LED output current.

For adjustable output voltages connect this pin via a voltage divider in parallel to the output

capacitor.

5

6

BDS

BUO

Buck Driver Supply Input;

Connect the bootstrap capacitor between this pin and pin BUO.

Buck Switch Output;

Source of the integrated power-switch. Connect directly to the cathode of external freewheeling

diode and the buck circuit inductance.

7

EN

VS

Enable Input;

Apply logic high signal to enable the device. A pull down resistor is integrated.

8

Supply Voltage Input;

Connect to supply voltage source.

EP

Exposed Pad;

Connect to heatsink area and GND by low inductance wiring.

Datasheet

4

Rev. 1.1, 20011-01-25

ILD4180

General Product Characteristics

4

General Product Characteristics

4.1

Absolute Maximum Ratings

Absolute Maximum Ratings ¹⁾

T_j= -40 ⋅C to +125 ⋅C; all voltages with respect to ground (unless otherwise specified)

Pos.

Parameter

Symbol

Limit Values

Max.

Unit Conditions

Min.

Voltages

4.1.1

PWMI (Pin1)

PWM Input

V_PWMI

V_COMP

-0.3

45

V

–

4.1.2

4.1.3

4.1.4

COMP (Pin 3)

Compensation Input

5.5

6.2

5.5

V

–

t < 10s²⁾

FB (Pin 4)

V_FB

-0.3

–

Feedback Input

4.1.5

4.1.6

4.1.7

4.1.8

BDS (Pin 5)

Buck Driver Supply Input

V_BDS

V_BUO

V_EN

V_S

V_BUO

- 0.3

V_BUO

+ 5.5

V

–

BUO (Pin 6)

Buck Switch Output

-2.0

-40

V

_VS+ 0.3

EN (Pin 7)

Enable Input

45

VS (Pin 8)

-0.3

Supply Voltage Input

Temperatures

4.1.9

Junction Temperature

Storage Temperature

T_j

-40

-55

150

°C

–

4.1.10

T_stg

ESD Susceptibility

4.1.11

ESD Resistivity all Pins to GND

V_ESD

-2

2

kV

HBM ³⁾

1) Not subject to production test, specified by design

2) Exposure to those absolute maximum ratings for extended periods of time (t > 10s) may affect device reliability

3) ESD susceptibility HBM according to EIA/JESD 22-A 114B (1.5kΩ,100pF).

Note:Stresses above the ones listed here may cause permanent damage to the device. Exposure to absolute

maximum rating conditions for extended periods may affect device reliability.

Note:Integrated protection functions are designed to prevent IC destruction under fault conditions described in the

data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are

not designed for continuous repetitive operation.

Datasheet

5

Rev. 1.1, 20011-01-25

ILD4180

General Product Characteristics

4.2

Functional Range

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

4.75

0.60

18

Max.

45

4.2.1

4.2.2

4.2.3

4.2.4

4.2.5

4.2.6

Supply Voltage

V_S

V

–

Output Voltage adjust range

External buck inductor

External buck capacitor

External buck capacitor ESR

Junction Temperature

V_CC

L_BU

16

V

see Figure 5

56

µH

µF

Ω

see Figure 5 and

Figure 6

C_BU1

ESR_BU1

T_j

33

120

0.3

125

1)

–

-40

°C

–

1) See section ““Application Information” on Page 11” for loop compensation requirements.

Note:Within the functional range the IC operates as described in the circuit description. The electrical

characteristics are specified within the conditions given in the related electrical characteristics table.

4.3

Thermal Resistance

Note:This thermal data was generated in accordance with JEDEC JESD51 standards.

For more information, go to www.jedec.org.

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

10

Max.

1) 2)

1) 3)

4.3.1

4.3.2

Junction to Case

R_thJC

R_thJA

–

K/W

Junction to Ambient (2s2p)

42

1) Not subject to production test, specified by design.

2) Specified R_thJCvalue is simulated at natural convection on a cold plate setup (all pins and the exposed pad are fixed to

ambient temperature). Ta=25°C, power-switch is dissipating 1W.

3) Specified RthJA value is according to Jedec JESD51-2,-5,-7 at natural convection on FR4 2s2p board; The Product

(Chip+Package) was simulated on a 76.2 x 114.3 x 1.5 mm board with 2 inner copper layers (2 x 70µm Cu, 2 x 35µm Cu).

According to JESD51-5 a thermal via array under the exposed pad contacted the first inner copper layer. Ta=25°C, power-

switch is dissipating 1W.

Datasheet

6

Rev. 1.1, 20011-01-25

ILD4180

Buck Regulator

5

Buck Regulator

5.1

Description

The gate of the power-switch is driven by the Gate driver which is supplied by the external capacitor connected to

pin BDS (Buck Driver Supply) using the bootstrap principle.

BDS is the supply pin for the integrated gate driver of the internal power-switch. The power-switch has to be in the

R

_DSonregion. If V_GSis not high enough, the power-switch can not operate in the R_DSONregion, which means high

power dissipation. An integrated under voltage lockout function (BDS UV-Comparator) supervising the ’bootstrap’

capacitor voltage ensures that the device is always driven with a sufficient bootstrap voltage in order to prevent

from extensive heat up of the power-switch.

An integrated charge pump supports the gate driver in case of low input supply voltage, small differential voltage

between input supply and output voltage at low current and during startup. In order to minimize emission, the

charge pump is switched off if the input voltage is sufficient for supplying the bootstrap.

The soft start function generates a defined ramp of the reference voltage during the first 0.5 ms (typ.) after device

initialization and if the Device is autorestarting after a thermal shutdown. This function is disabled during the

dimming operation via the PWMI-pin.

8

3

VS

Charge

Pump

Overcurrent

Comp.

COMP

BDS

5

BDS

Charger

Clock

Logic

Feedback

Error Amp.

Gate

Driver

+

FB

4

-

PWM

Comp.

Power

Switch

Soft Start

Ramp

6

BUO

Temp.

Sensor

BDS

UV Comp.

Ramp Generator

=

V_REF=0.6V

2

1

PWMI

GND

Figure 3

Block Diagram Buck Regulator

Datasheet

7

Rev. 1.1, 20011-01-25

ILD4180

Buck Regulator

5.2

Electrical Characteristics

All parameters have been tested at 25°C, unless otherwise specified.

Electrical Characteristics: Buck Regulator

V_S= 24V, T_j= -40 ⋅C to +125 ⋅C, all voltages with respect to ground (unless otherwise specified)

Pos.

Parameter

Symbol

Limit Values

Unit Conditions

Min. Typ. Max.

5.2.1

FB input voltage

V_FB

0.588 0.60

0.612

V

_EN= V_S;

V_S= 12V

0.1A < I_CC< 1.0A

_EN= V_S;

V

5.2.2

V_FB

0.576 0.60

0.624

V

V_S= 12V

1mA < I_CC< 1.8A

5.2.3

5.2.4

FB input current

I_FB

-1

–

-0.1

–

0

µA

V_FB= 0.6V

Power-Switch on-resistance

R_DS(ON)

500

mΩ I_CC=300 mA;

T_J= 150 °C max.

I_CC=1 A ¹⁾

5.2.5

5.2.6

5.2.7

Current transition rise/fall time

Buck peak over current limit

t_r

–

50

–

ns

A

I_BUOC

V_BDS,off

2.2

3.6

–

Bootstrap under voltage lockout,

turn-off threshold

V_BUO

+3.3

–

V

Bootstrap voltage

decreasing

5.2.8

5.2.9

Charge pump current

I_CP

2

–

5

mA V_S= 12V;

V

_BUO= V_BDS= GND

Charge pump switch-off threshold V_BDS

-

V

(V_BDS- V_BUO) increasing

V_BUO

1) 2)

5.2.10 Maximum duty cycle

5.2.11 Soft start ramp

D_max

t_start

100

750

%

350 500

µs

V_FBrising from 5% to

95% of V_FB,nom

5.2.12 Input under voltage shutdown

threshold

V_S,off

3.75

–

V

V_Sdecreasing

5.2.13 Input voltage startup threshold

V_S,on

V_S,hyst

–

4.75

–

V

V_Sincreasing

1)

5.2.14 Input under voltage shutdown

hysteresis

150

mV

1) Not subject to production test; specified by design.

2) Consider “Chapter 4.2, Functional Range”

Datasheet

8

Rev. 1.1, 20011-01-25

ILD4180

Enable, Thermal Shutdown and PWM Dimming Function

6

Enable, Thermal Shutdown and PWM Dimming Function

6.1

Description

Enable Function: With the enable pin (EN) the device can be set in off-state reducing the current consumption to

typ. 0.1µA. The enable function features an integrated pull down resistor which ensures that the IC is shut down

and the power-switch is off in case the pin EN is not connected.

Device Wake Up Behavior: The device initialization is triggered either by the EN voltage level crossing the turn-

on threshold, rising supply voltage (during EN=H), and also when the device restarts after a thermal shutdown.

The softstart ramp starts after the BDS external capacitor is charged.

Overtemperature Behavior: The integrated thermal shutdown function turns the power-switch off in case of

overtemperature. The typ. junction shutdown temperature is 175°C, with a min. of 150°C. After cooling down the

IC will automatically restart operation. The thermal shutdown is an integrated protection function designed to

prevent IC destruction when operating under fault conditions. It must not be used for normal operation.

PWM Dimming Function: The PWMI signal directly controls the gate driver of the integrated power-switch by

overriding the internal control signals.

6.2

Electrical Characteristics Enable, Bias, Thermal Shutdown and PWM Dimming

All parameters have been measured at 25°C, unless otherwise specified.

Electrical Characteristics: Enable, Bias and Thermal Shutdown

V_S= 24V, T_j= -40 ⋅C to +125 ⋅C, all voltages with respect to ground (unless otherwise specified)

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

Max.

6.2.1

Current Consumption,

shut down mode

I_q,OFF

–

0.1

2

µA

V

_EN= 0.8V;

T_j< 105°C; V_S= 16V

1)

6.2.2

6.2.3

Current Consumption,

active mode

I_q,ON

–

7

mA

V

_EN= 5.0V; I_CC= 0mA;

V_S= 16V

V_EN= 5.0V; I_CC= 1.8A;

Current Consumption,

active mode

10

V_S= 16V

1)

6.2.4

6.2.5

6.2.6

6.2.7

6.2.8

6.2.9

Enable high signal valid

Enable low signal valid

Enable hysteresis

V_EN,hi

3

–

V

–

V_EN,lo

–

0.8

400

30

1

V

–

1)

V_EN,HY

I_EN,hi

50

–

200

–

mV

µA

V

Enable high input current

Enable low input current

PWMI high threshold

V

–

_EN= 16V

I_EN,lo

–

0.1

–

_EN= 0.5V

V_PWMI,hi

V_PWMI,lo

t_PWM,ON

t_PWM,OFF

3

–

6.2.10 PWMI low threshold

6.2.11 PWMI turn-on delay

6.2.12 PWMI turn-off delay

–

0.8

5

V

–

2)

–

µs

°C

K

–

5

–

1)

6.2.13 Over temperature shutdown T_j,sd

150

–

175

15

190

–

1)

6.2.14 Overtemperatureshutdown T_{j,sd_hyst}

hysteresis

1) Specified by design. Not subject to production test.

2) At startup current flowing in C_BU1, recommended max. PWM frequency 1kHz@370kHz f_sw

Datasheet

9

Rev. 1.1, 20011-01-25

ILD4180

Oscillator

7

Oscillator

7.1

Description

The oscillator turns on the power-switch with a constant frequency while the buck regulating circuit turns the

power-switch off in every cycle with an appropriate time gap depending on the output and input voltage.

The internal sawtooth signal used for the PWM generation has an amplitude proportional to the input supply

voltage (feedforward).

7.2

Electrical Characteristics Oscillator

All parameters have been measured at 25°C, unless otherwise specified.

Electrical Characteristics: Buck Regulator

V_S= 24V, T_j= -40 ⋅C to +125 ⋅C, all voltages with respect to ground (unless otherwise specified)

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

Max.

420

7.2.1

Oscillator frequency

f_osc

330

370

kHz

–

Datasheet

10

Rev. 1.1, 20011-01-25

ILD4180

Application Information

8

Application Information

Note:The following information is given as a hint for the implementation of the device only and shall not be

regarded as a description or warranty of a certain functionality, condition or quality of the device.

8.1

Frequency Compensation

The stability of the output voltage can be achieved with a simple RC connected between pin COMP and GND. The

standard configuration using the switching frequency of the internal oscillator is a ceramic capacitor C_COMP= 22nF

and R_COMP= 22kΩ. By slight modifications to the compensation network the stability can be optimized for different

types of buck capacitors (ceramic or tantalum).

The compensation network is essential for the control loop stability. Leaving pin COMP open might lead to an

instable operation.

8.2

Compensating a tantalum buck capacitor C_BU1

The ILD4180 control loop is optimized for ceramic buck capacitors C_BU. In order to maintain stability also for

tantalum capacitors with ESR up to 300mΩ, an additional compensation capacitance C_COMP2at pin COMP to GND

is required. It’s value calculates:

C_COMP2= C_BU* ESR(C_BU) / R_COMP,

whereas C_COMP2needs to stay below 5nF.

Application _C-COMP2.vsd

COMP

3

ILD4180

ILD5085

C_COMP

C_COMP2

2

R_COMP

GND

Figure 4

High-ESR buck capacitor compensation

8.3

Freewheeling Diode

In order to minimize losses and for fast recovery, a schottky freewheeling diode is required. Disconnecting the

freewheeling diode during operation might lead to destruction of the IC.

Datasheet

11

Rev. 1.1, 20011-01-25

ILD4180

Application Information

8.4

Constant Output Voltage Mode for LED applications

V_S= 4.75V to 45V

ILD5085

ILD4180

8

VS

C_S

C_bootstrap

5

6

BDS

BUO

L_BU

connect to µC

or directly to VS

7

1

EN

R_balance1

R_balance2

D_BU

C_BU1C_BU2

PWM Dimming

PWMI

COMP

R₁

V_CC

3

4

FB

R₂

GND

2

C_COMP

V_FB

C_COMP2

R_COMP

SPIDER-LS

TLE7240SL

Optional

Parts

Figure 5

Application Diagram (constant voltage mode)

Note:This is a very simplified example of an application circuit. The function must be verified in the real application

The output voltage of the ILD4180 can be programmed by a voltage divider connected to the feedback pin FB.

The divider cross current should be 300 µA at minimum, therefore the maximum R₂calculates:

R₂≤ V_FB/ I_R2--> R₂≤ 0.6V / 300 µA = 2 kΩ

For the desired output voltage level V_CC, R₁calculates then (neglecting the small FB input current):

V

CC

⎛

⎞

R

= R ---------- – 1 .

1

2

⎝

⎠

V

FB

Datasheet

12

Rev. 1.1, 20011-01-25

ILD4180

Application Information

8.5

Constant current mode for LED applications

V_S= 4.75V to 45V

ILD4180

ILD5085

8

VS

C_S

C_bootstrap

5

6

BDS

BUO

L_BU

connect to µC

or directly to VS

7

1

EN

D_BUC_BU1

PWM Dimming

PWMI

LED chain length:

is dependend on input voltage

3

4

COMP

FB

GND

C_COMP1

2

C_COMP2

0.6V

R_COMP

R_FB

=

I_LED

Optional

Parts

Figure 6

Application Diagram ILD4180 as LED Driver (constant current mode)

Note:This is a very simplified example of an application circuit. The function must be verified in the real application.

Datasheet

13

Rev. 1.1, 20011-01-25

ILD4180

Package Outlines

9

Package Outlines

0.35 x 45˚

1)

0.1

3.ꢀ

0.1 C D 2x

+0.06

0.1ꢀ

0.08

Seating Plane

C

0.64

0.25

1.27

0.2

2)

M

0.0ꢀ

0.2

D 8x

0.41

6

M

C A-B D 8x

D

Bottom View

0.2

3

A

1

4

8

5

1

4

8

5

B

0.1 C A-B 2x

1)

0.1

4.ꢀ

Index Marking

1) Does not include plastic or metal protrusion of 0.15 max. per side

2) Dambar protrusion shall be maximum 0.1 mm total in excess of lead width

3) JEDEC reference MS-012 variation BA

PG-DSO-8-27-PO V01

Figure 7

Outline PG-DSO-8-27

Green Product (RoHS compliant)

To meet the world-wide customer requirements for environmentally friendly products and to be compliant with

government regulations the device is available as a green product. Green products are RoHS-Compliant (i.e

Pb-free finish on leads and suitable for Pb-free soldering according to IPC/JEDEC J-STD-020).

For further package information, please visit our website:

Dimensions in mm

http://www.infineon.com/packages.

Datasheet

14

Rev. 1.1, 20011-01-25

ILD4180

Revision History

10

Revision History

Version Date

Changes

Rev. 1.1 2011-01-25 Updated Thermal Section

Rev. 1.0 2009-10-14 Initial Datasheet for ILD4180

Datasheet

15

Rev. 1.1, 20011-01-25

Edition 20011-01-25

Published by

Infineon Technologies AG

81726 Munich, Germany

Legal Disclaimer

The information given in this document shall in no event be regarded as a guarantee of conditions or

characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any

information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties

and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights

of any third party.

Information

For further information on technology, delivery terms and conditions and prices, please contact the nearest

Infineon Technologies Office (www.infineon.com).

Warnings

Due to technical requirements, components may contain dangerous substances. For information on the types in

question, please contact the nearest Infineon Technologies Office.

Infineon Technologies components may be used in life-support devices or systems only with the express written

approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure

of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support

devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain

and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may

be endangered.


型号：	ILD4180XUMA1
厂家：	Infineon
描述：	Switching Regulator, 420kHz Switching Freq-Max, PDSO8, GREEN, PLASTIC, MS-012BA, SOP-8 开关光电二极管输出元件
文件：	总16页 (文件大小：296K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

ILD4180XUMA1 [INFINEON]

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