RT8510_技术文档

®

RT8510

43V 4-CH LED Driver

General Description

Features

^Wide Input Voltage : 4.2V to 24V

The RT8510 is a high efficiency driver for white LEDs. It is

designed for LCDpanels that employ an array of LEDs as

the lighting source. An integrated switch current mode

boost controller drives four strings in parallel and supports

up to 12 pieces of LED per string. The internal current

sinks support a maximum of 2% current mismatching

for excellent brightness uniformity in each string of LED.

To provide enough headroom for current sink operation

the boost controller monitors the minimum voltage of

feedback pins and regulates an optimized output voltage

for power efficiency.

^High Output Voltage : Up to 43V

^Adjustable Channel Current : 10mA to 40mA

^Channel Current Accuracy : 3%

^Channel Current Matching : 2%

^PWM Dimming Frequency : 120Hz to 30kHz

^Adjustable Switching Frequency : 500kHz to 2MHz

^Built-In Soft-Start

^Disconnects LED in Shutdown

^Open Current Sink Detection

^Adjustable Over Voltage Protection

^Over Temperature Protection

The RT8510 has a wide input voltage range from 4.2V to

24V and provide an adjustable 10mAto 40mALEDcurrent.

The internal 200mΩ, 43V power switch with current-mode

control provides cycle-by-cycle over current protection.

The RT8510 also integrates PWM dimming function for

accurate LED current control. The input PWM dimming

frequency can operate from 120Hz to 30kHz without

inducing any inrush current through the LED or inductor.

The switching frequency of the RT8510 is adjustable from

500kHz to 2MHz, allowing the user flexibility between

efficiency and component size.

 Current Limit Protection

 Thin 16-Lead WQFN Package

 RoHS Compliant and Halogen Free

Applications

 UMPC andNotebook Computer Backlight

 GPS, Portable DVD Backlight

Pin Configuration

(TOP VIEW)

The RT8510 is available in a WQFN-16L 3x3 package.

16 15 14 13

1

2

3

4

12

11

10

9

AGND

COMP

ISET

RT

OVP

PGND

LX

Ordering Information

RT8510

GND

17

Package Type

QW : WQFN-16L 3x3 (W-Type)

5

6

7

8

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

Note :

WQFN-16L 3x3

Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

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RT8510

Marking Information

HU= : Product Code

YMDNN : Date Code

HU=YM

DNN

Typical Application Circuit

V

OUT

43V MAX

L

D1

10µH

V

IN

4.2V to 24V

R2

10

C

10µF

IN

RT8510

R

2M

OVP2

7

6

:

8, 9

12

VIN

EN

LX

10 LED String

C2

1µF

C

10µF

OUT

Chip Enable

OVP

R

OVP1

100k

62k

5

2

13

14

15

16

CH1

CH2

CH3

CH4

PWM Dimming

PWM

COMP

4

3

R3

10k

RT

C4

1nF

ISET

PGND

R

51k

RT

C3

10nF

AGND

R

4.75k

ISET

1

10, 11

Figure 1. GeneralApplication Circuit

V

OUT

23V MAX

depends on D

L

(V

OUT

)

MAX

D1

10µH

V

BATT

2.7V to 24V

C

IN

10µF

RT8510

R

2M

OVP2

7

:

8, 9

12

:

VIN

EN

5V

Chip Enable

LX

10 LED String

C

10µF

OUT

C2

1µF

OVP

6

R

OVP1

100k

62k

5

2

13

14

15

CH1

CH2

CH3

CH4

PWM Dimming

PWM

COMP

4

3

R3

10k

RT

C4

1nF

16

ISET

PGND

R

51k

RT

C3

10nF

AGND

R

4.75k

ISET

1

10, 11

Figure 2. Low Input Voltage Application Circuit

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RT8510

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

AGND

Analog ground of LED driver.

Compensation pin for error amplifier. Connect a compensation network to

ground.

LED current set pin. LED current is set by the value of the resistor R_ISET

connected from the ISET pin to ground. Do not short the ISET pin. V_ISETis

typically 0.6V.

2

3

COMP

ISET

95

I_LED

=

R_ISET

Frequency adjust pin. This pin allows setting the switching frequency with a

resistor to 500kHz to 2MHz.

4

5

RT

PWM

Dimming control input.

Chip enable (Active High). Note that this pin is high impedance. There should be

a pull low 100k resistor connected to GND when the control signal is floating.

6

EN

7

8, 9

10, 11

12

VIN

Power supply input.

LX

Switching pin of boost converter.

PGND

OVP

Power ground of boost converter.

Sense input for over voltage protection. The detecting threshold is 1.2V.

13, 14, 15, 16 CH1 to CH 4 Current sink for LED. Leave the pin unconnected, if not used.

The exposed pad must be soldered to a large PCB and connected to GND for

maximum power dissipation.

17 (Exposed Pad) GND

Functional Block Diagram

OVP

LX

EN

VIN

+

-

1.2

Regulator

RT

OSC

S

R

Q

OCP

OTP

PWM

Controller

+

-

PGND

CH1

0.4V

+

4

COMP

PWM

EA

LED

Detection

-

CH2

CH3

CH4

+

-

+

-

+

-

0.6V

+

-

ISET

AGND

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RT8510

Absolute Maximum Ratings (Note 1)

 Supply Input Voltage to GND ------------------------------------------------------------------------------------------- −0.3V to 26.5V

 EN, PWM, ISET, COMP, RT to GND --------------------------------------------------------------------------------- −0.3V to 26.5V

 LX, OVP, CH1, CH2, CH3, CH4 toGND ----------------------------------------------------------------------------- −0.3V to 48V

 PowerDissipation, P_D@ T_A= 25°C

WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------------ 1.471W

 Package Thermal Resistance (Note 2)

WQFN-16L 3x3, θ_JA------------------------------------------------------------------------------------------------------- 68°C/W

WQFN-16L 3x3, θ_JC------------------------------------------------------------------------------------------------------ 7.5°C/W

 Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------------- 260°C

 Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C

 Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C

 ESD Susceptibility (Note 3)

HBM -------------------------------------------------------------------------------------------------------------------------- 2kV

MM---------------------------------------------------------------------------------------------------------------------------- 200V

Recommended Operating Conditions (Note 4)

 Supply Input Voltage, V_IN------------------------------------------------------------------------------------------------ 4.2V to 24V

 Junction Temperature Range-------------------------------------------------------------------------------------------- −40°C to 125°C

 Ambient Temperature Range-------------------------------------------------------------------------------------------- −40°C to 85°C

Electrical Characteristics

(V_IN= 4.5V, T_A= 25°C unless otherwise specified)

Parameter

VIN Quiescent Current

VIN Shutdown Current

VIN Under Voltage Lockout

Control Input

Symbol

Test Conditions

Min

Typ Max Unit

V

_COMP= 0V, no switching

--

1

2

1.5

3

I_Q

mA

A

V

V_COMP= 2V, switching

V_IN= 4.5V, EN = 0V

Rising

I_SHDN

UVLO

--

10

--

2.2

2.1

Falling

--

Logic-High V_IH

2

--

0.8

30k

6

EN, PWM Threshold

Voltage

V_IN= 4.2V to 24V

V

Logic-Low V_IL

PWM Dimming Frequency

EN, PWM Leakage Current

EN Shutdown Delay

f_PWM

I_LKG

t_EN

120

2

--

Hz

A

ms

--

R_RT= 51k

--

32

--

Boost Converter

R

_RT= 25k

--

2

1

--

Switching Frequency

f_OSC

R_RT= 51k

MHz

R_RT= 102k

0.5

0.2

--

LX On Resistance (N-MOSFET) R_{DS(ON)_N}V_IN> 4.5V

0.32



Minimum ON Time

Maximum Duty

t_MON

D_MAX

I_LIM

--

120

90

2

--

ns

%

A

V_COMP= 2V, switching

LX Current Limit

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DS8510-04 March 2017

RT8510

Parameter

Symbol

Test Conditions

Min

Typ Max Unit

LED Current Programming

2V > CHx > 0.4V calculating

(I_(MAX) I_(AVG)) / I_(AVG)x 100%,

R_ISET= 4.75k

LED Current Matching

I_LEDM

--

±2

%

ISET Pin Voltage

LED Current

V_ISET

I_CHx

--

0.6

20

--

V

2V > CHx > 0.4V, R_ISET= 4.75k

19.4

20.6

mA

Fault Protection

OVP Threshold

OVP Fail Threshold

V_OVP

1.16

--

1.2

50

1.24

--

V

V_OVPF

mV

°C

Thermal Shutdown Temperature T_SD

--

160

--

LED Pin Under Voltage

V_LSD

No connection

--

50

--

mV

V

Threshold

Highest LED string voltage,

R_ISET= 4.75k

Regulated V_CHx

V_CHx

0.4

Note 1. Stresses beyond those listed “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 in

the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may

affect device reliability.

Note 2. θ_JAis measured under natural convection (still air) at T_A= 25°C with the component mounted on a high effective-

thermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. θ_JCis measured at the

exposed pad of the package.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

Note 5. Guaranteed by design; not subject to production testing.

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RT8510

Typical Operating Characteristics

LED Current vs. Input Voltage

Efficiency vs. Input Voltage

26

24

22

20

18

16

14

100

90

80

70

60

50

40

30

20

CH1

CH2

CH3

CH4

10

f_OSC= 1MHz

19 24

10 x 4 LEDs, f_OSC= 1MHz

0

4

9

14

4

8

12

16

20

24

Input Voltage (V)

LED Current vs. Temperature

V_ISETvs. Temperature

26

24

22

20

18

16

14

0.70

0.65

0.60

0.55

0.50

0.45

0.40

V_IN= 12V, f_OSC= 1MHz

50 75 100 125

V_IN= 12V, f_OSC= 1MHz

50 75 100 125

-50

-25

0

25

-50

-25

0

25

Temperature (°C)

V_ISETvs. Input Voltage

LED Current vs. PWM Duty Cycle

0.8

0.7

0.6

0.5

0.4

0.3

90

80

70

60

50

40

30

20

10

0

PWM = 30kHz

PWM = 10kHz

PWM = 1kHz

PWM = 120Hz

f_OSC= 1MHz

20 24

10 x 4 LEDs, f_OSC= 1MHz

10 20 30 40 50 60 70 80 90 100

Duty Cycle (%)

4

8

12

16

0

Input Voltage (V)

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RT8510

OVP Threshold vs. Input Voltage

Switch Off Current vs. Temperature

1.5

1.4

1.3

1.2

1.1

1.0

1.5

1.3

1.1

0.9

0.7

0.5

f_OSC= 1MHz, V_IN= 4.5V

f_OSC= 1MHz

-50

-25

0

25

50

75

100

125

4

8

12

16

20

24

Input Voltage (V)

Temperature (°C)

Line Transient Response

V_IN

(5V/Div)

V_IN

(2V/Div)

I_OUT

(50mA/Div)

I_OUT

(50mA/Div)

V_IN= 4.5V to 5.5V, f_OSC= 1MHz

Time (50ms/Div)

V_IN= 11V to 14V, f_OSC= 1MHz

Time (50ms/Div)

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RT8510

Application Information

T2

T4

T1

T3

The RT8510 is a general purpose 4-CH LEDdriver capable

of delivering an adjustable 10 to 40mA LED current. The

IC is a current mode boost converter integrated with a

43V/2Apower switch and can cover a wide V_INrange from

4.2V to 24V. The switching frequency is adjustable by an

external resistor from 500kHz to 2MHz. The part

integrates built-in soft start, with PWM dimming control;

moreover, it provides over voltage, over temperature and

current limiting protection features.

CLK

Output of PWM

Comparator

PWM

Pulse

Normal

Operation

Normal

Operation Skipped

Pulse

Normal

Operation

Figure 3. Pulse Skip Mode

Setting and Regulation of LED Current

Soft-Start

The LED current can be calculated by the following

equation :

The RT8510 equips a built-in soft-start feature to prevent

high inrush current during start-up. The soft-start function

prevents excessive input current and input voltage droop

during power on state.

95

I_LED



R_ISET

where R_ISETis the resistor between the ISET pin andGND.

This setting is the reference for the LEDcurrent at channel

1-4 and represents the sensed LEDcurrent for each string.

TheDC/DC converter regulates the LEDcurrent according

Compensation

The control loop can be compensates by adjusting the

external components connected to the COMP pin. The

COMP pin is the output of the internal error amplifier. The

compensation capacitors, C3 and C4, will adjust the

integrator zero and pole respectively to maintain stability.

Moreover, the resistor, R3, will adjust the frequency

integrator gain for fast transient response.

to R_ISET

.

Power Sequence

LEDDriver is without power sequence concern. Figure 4,

Figure 5 and Figure 6 are different power sequences

respectively. There is no concern in the above condition.

VIN

Switching Frequency

The LEDdriver switching frequency is able to adjusted as

the following equation :

51k

VOUT

EN

f_OSC



(MHz)

R_RT

LED Connection

PWM

The RT8510 equips 4-CH LED divers with each channel

supporting up to 12 LEDs. The LED strings are connected

from the output of the boost converter to pins 13, 14, 15

and 16 respectively. If one of the LEDchannel is not used,

the LED pin should be opened directly.

Power On Mode 1

VIN

VOUT

EN

Light Load Mode

When the input voltage is close to the output voltage,

V_OUTripple will increase. The V_OUTshould be set at higher

than 1.2 x V . If duty pulse is close to minimum on-time

PWM

IN

and smaller than 120ns, the duty pulse will be skipped.

Figure 3 shows the timing diagram with skipped pulse.

Power On Mode 2

Figure 4

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RT8510

Over Voltage Protection

VIN

The RT8510 integrates over voltage protection (OVP)

function. When the voltage at the OVP pin reaches the

threshold voltage, the internal switch will be turned off.

The internal switch will be turned on again once the voltage

at OVP pin drops below its threshold voltage.

VOUT

EN

PWM

The OVP threshold voltage is adjustable and can be

clamped at a certain voltage level and it can be calculated

by the following equation :

Power Off Mode 1

VIN







R_OVP2

V_OUT(OVP) V_OVP 1



R_{OVP1 }



VOUT

where V_OVP= 1.2V (typ.).

R_OVP1and R_OVP2are the resistors in the voltage divider

connected to the OVP pin. If at least one string is in normal

operation, the controller will automatically ignore the open

strings and continue to regulate the current for the strings

in normal operation. It is suggested to use 2MΩ for R_OVP2

to reduce loading effect.

EN

PWM

Power Off Mode 2

Figure 5

Current Limit Protection

VIN

The RT8510 can limit the peak current to achieve over

current protection. The RT8510 senses the inductor

current during the “ON” period that flows through the LX

pin. The duty cycle depends on the current signal and

internal slope compensation in comparison with the error

signal. The internal switch will be turned off when the

current signal is larger than the internal slope

compensation. In the “OFF” period, the inductor current

will be decreased until the internal switch is turned on by

the oscillator.

UVLO

VOUT

EN

PWM

Power On Mode 3

VIN

UVLO

Brightness Control

VOUT

The RT8510 brightness dimming control is determined by

the signal on the PWM pin with a suggested PWM

frequency range from 120Hz to 30kHz. However, the LED

current cannot be 100% proportional to duty cycle

especially for high frequency and low duty ratio because

of physical limitation caused byinductor rising time. Please

refer to Table 1 and Figure 7.

EN

PWM

Power On Mode 3

Figure 6

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RT8510

Table 1.

Dimming Frequency (Hz) Duty (Min.) Duty (Max.)

where V_OUTis the maximum output voltage, V_INis the

minimum input voltage, f_OSCis the operating frequency

and I_OUTis the total current from all LED strings.

120 < f

500 < f

1k < f

 500

 1k

0.2%

0.4%

0.8%

1.5%

3%

100%

PWM

The boost converter operates inDCM over the entire input

voltage range when the inductor value is below this value

L. When inductance greater is than L, the converter

operates in CCM at the minimum input voltage and may

be discontinuous at higher voltages.

 2k

PWM

2k < f

5k < f

 5k

PWM

 10k

 30k

10k < f

10%

PWM

Note : The minimum duty in Table 1 is based on the application

circuit and does not consider the deviation of current linearity.

The inductor must be selected with a saturated current

rating that is greater than the peak current provided by

the following equation :

LED Current vs. PWM Duty Cycle

90

V_OUTI_OUT

V_IND T

I_PEAK





80

70

60

  V

2L

IN

where η is the efficiency of the power converter and T is

the operating period.

50

PWM = 30kHz

Diode Selection

PWM = 10kHz

PWM = 1kHz

40

Schottky diodes are recommended for most applications

because of their fast recovery time and low forward voltage.

The power dissipation, reverse voltage rating and pulsating

peak current are the important parameters for Schottky

diode selection. Make sure that the diode's peak current

rating exceeds I_PEAKand reverse voltage rating exceeds

the maximum output voltage.

30

20

10

0

PWM = 120Hz

V_IN= 12V, V_PWM= 0V to 3V

0

10 20 30 40 50 60 70 80 90 100

Duty Cycle (%)

Figure 7

Output Capacitor Selection

Over Temperature Protection

The input capacitor reduces current spikes from the input

supply and minimizes noise injection to the converter. For

most applications, a 10μF ceramic capacitor is sufficient.

A value higher or lower may be used depending on the

noise level from the input supply and the input current to

the converter.

The RT8510 has over temperature protection function to

prevent the IC from overheating due to excessive power

dissipation. The OTP function will shutdown the IC when

junction temperature exceeds 160°C .

Inductor Selection

For lower output voltage ripple, a low ESR ceramic

capacitor is recommended. The output voltage ripple

consists of two components: one is the pulsating output

ripple current flowing through the ESR, and the other is

The value of the inductance L can be approximated by the

following equation, where the transition is from

discontinuous conduction mode (DCM) to continuous

conduction mode (CCM) :

V

 V

 V

D(1 D)² V_OUT

RIPPLE

RIPPLE_ESR RIPPLE_C

L 











I

V

 V

f 

2 f_OSCI_OUT

PEAK

AVDD IN1

 I

R



PEAK

ESR

C

V

^OUT1 AVDD

The duty cycle can be calculated according to the following

equation :

V_OUT V

IN

D 

V_OUT

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RT8510

Thermal Considerations

Layout Considerations

The junction temperature should never exceed the

absolute maximum junction temperature T_J(MAX), listed

under Absolute Maximum Ratings, to avoid permanent

damage to the device. The maximum allowable power

dissipation depends on the thermal resistance of the IC

package, the PCB layout, the rate of surrounding airflow,

and the difference between the junction and ambient

temperatures. The maximum power dissipation can be

calculated using the following formula :

PCB layout is very important for designing switching power

converter circuits. The following layout guides should be

strictly followed for best performance of the RT8510.

 The power components, L1, D1, C_IN, C_OUTmust be

placed as close as possible to reduce current loop. The

PCB trace between power components must be as short

and wide as possible.

 Place L1 and D1as close as possible to LX pin . The

trace should be as short and wide as possible.

P_D(MAX)= (T_J(MAX)− T_A) / θ_JA

 The compensation circuit should be kept away from

the power loops and should be shielded with a ground

trace to prevent any noise coupling. Place the

compensation components as close as possible to

COMP pin.

where T_J(MAX)is the maximum junction temperature, T_Ais

the ambient temperature, and θ_JAis the junction-to-ambient

thermal resistance.

For continuous operation, the maximum operating junction

temperature indicated under Recommended Operating

Conditions is 125°C. The junction-to-ambient thermal

resistance, θ_JA, is highly package dependent. For a

WQFN-16L 3x3, the thermal resistance, θ_JA, is 68°°C/W

on a standard JEDEC 51-7 high effective-thermal-

conductivity four-layer test board. The maximum power

dissipation at T_A= 25°C can be calculated as below :

 The exposed pad of the chip should be connected to

ground plane for thermal consideration.

The compensation circuit

should be kept away from the

power loops and should be

shielded with a ground trace

to prevent any noise coupling.

Place the power components

as close as possible. The

traces should be wide and

short especially for the high-

current loop.

16 15 14 13

1

2

3

4

12

11

10

9

GND

AGND

COMP

ISET

RT

OVP

C3

R3

PGND

LX

GND

P_D(MAX)= (125°C − 25°C) / (68°C/W) = 1.471W for a

WQFN-16L 3x3 package.

17

V

OUT

C4

D1

5

6

7

8

The maximum power dissipation depends on the operating

ambient temperature for the fixed T_J(MAX)and the thermal

resistance, θ_JA. The derating curves in Figure 1 allows

the designer to see the effect of rising ambient temperature

on the maximum power dissipation.

L1

C

OUT

C

V

R2

IN

C2

GND

IN

Figure 9. PCB Layout Guide

1.60

Four-Layer PCB

1.40

1.20

1.00

0.80

0.60

0.40

0.20

0.00

0

25

50

75

100

125

Ambient Temperature (°C)

Figure 8. Derating Curve of Maximum PowerDissipation

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RT8510

Outline Dimension

SEE DETAIL A

D

D2

L

1

E

E2

1

2

1

2

e

b

DETAILA

A

A3

Pin #1 ID and Tie Bar Mark Options

A1

Note : The configuration of the Pin #1 identifier is optional,

but must be located within the zone indicated.

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min

Max

Min

Max

A

A1

A3

b

0.700

0.000

0.175

0.180

2.950

1.300

2.950

1.300

0.800

0.050

0.250

0.300

3.050

1.750

3.050

1.750

0.028

0.000

0.007

0.116

0.051

0.116

0.051

0.031

0.002

0.010

0.012

0.120

0.069

0.120

0.069

D

D2

E

E2

e

0.500

0.020

L

0.350

0.450

0.014

0.018

W-Type 16L QFN 3x3 Package

Richtek Technology Corporation

14F, No. 8, Tai Yuen 1^stStreet, Chupei City

Hsinchu, Taiwan, R.O.C.

Tel: (8863)5526789

Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should

obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot

assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be

accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third

parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.

www.richtek.com

12

DS8510-04 March 2017


型号：	RT8510
厂家：	RICHTEK TECHNOLOGY CORPORATION
描述：	暂无描述
文件：	总12页 (文件大小：174K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

RT8510 [RICHTEK]

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