KIB3402F [KEC]

BICD LINEAR INTEGRATED CIRCUIT; BICD线性集成电路


型号：	KIB3402F
厂家：	KEC(KOREA ELECTRONICS)
描述：	BICD LINEAR INTEGRATED CIRCUIT BICD线性集成电路接口集成电路光电二极管驱动 CD
文件：	总6页 (文件大小：102K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SEMICONDUCTOR

KIB3402F

BICD LINEAR INTEGRATED CIRCUIT

TECHNICAL DATA

White LED Step-Up Converter

The KIB3402F is a monolithic step-up DC/DC converter specifically

designed to drive white LEDs with a constant current from Li-ion cell.

Relative large 320mV feedback voltage & it’s high accuracy help you

setting LED current with a external resistor.

DIM MILLIMETERS

2.9+0.05

KIB3402F is available in a extremely low profile & small TS-6 package.

A 4.7 H inductor is sufficient for most application.

1.6+0.05

0.7+0.05

0.4+0.05

2.8 0.07

1.9+0.05

FEATURES

0.95

0.16 +0.05

Inherently Matched LED Current.

0.05+0.05

High Efficiency : 85% (max.)

MIN 0.21

0.6 0.07

Built in a open circuits protection for the LEDs fail.

Drives Up to four LEDs without external zener diode.

Drives Up to six LEDs with external zener diode.

Built in a N-channel MOSFET Switch.

Fast 1.1MHz(typ.) Switching Frequency.

Uses Tiny 1mm Tall Inductors.

0.4

Bulit in Thermal protection.

TS6

Wide Dimming control range : 25%~100%.

Extremely low height & small Packaging.

Marking

APPLICATIONS

Celluars Phones

PDAs

Lot No.

Type Name

Digital Cameras

MP3 Players, Color Displays

402

TYPICAL APPLICATION

4.7 H~10

CONVERSION EFFICIENCY

87.00

85.00

83.00

81.00

79.00

77.00

75.00

LED1

LED2

LED3

LED4

1µF

OVD

1µF

KIB3402F

OFF

CTL

Shutdown and

Dimming control

Vin

3.0V

GND

21.5Ω

3.6V

4.3V

LOAD CURRENT (mA)

C1, C2 : X5R OR X7R DIELECTRIC

D1 : KEC KDR730E/KDR720E (Low V )

L1 : MURATA LQH32CN100K53L OR EQUIVALENT

Figure1. 4Series White LED Driver in Thin TS6

2006. 4. 20

Revision No : 0

1/6

KIB3402F

BLOCK DIAGRAM

OVD

One Shot

OUT

VRef

OUT

One Shot

Vth

320mV

CTL

ADC

GND

FB(Rsense)

figure 2. KIB3402F Block Diagram

MAXIMUM RATINGS (Ta=25

)

CHARATERISTICS

SYMBOL

V_CC

RATING

-0.3 ~ 6.0

-0.3 ~ 22

-40 ~ 85

-40 ~ 150

150

UNIT

Input Voltage

V_SW

Switching pin Voltage

V_OVD

Topr

Tstg

OVD pin Voltage

Operating temperature range

Storage temperature range

Maximum Junction temperature

RECOMMENDED OPERATING CONDITIONS (T_opr=-40~85

)

CHARATERISTICS

Input Voltage

SYMBOL

V_CC

CONDITION

MIN.

2.8

2.7

TYP.

MAX.

UNIT

5.5

V_CTL

CTL pin voltage for full LED current

CTL pin voltage to shutdown chip

CTL pin input pulse width

V_CC=3.0V

0.5

t_PW(CTL)

Both Positive and Negative pulse

V_CC=3.6V, R_SENSE=16

Topr =25 , Four LED

LED Current

CTL Response Delay

(When Power ON.)

T_pdCTL

2006. 4. 20

Revision No : 0

2/6

KIB3402F

ELECTRICAL CHARACTERISTIC

(Topr=-40~85 , V_CC=2.8~5.5V, R_SENSE=16 , unless otherwise noted.)

CHARATERISTICS

Input Voltage

SYMBOL

V_CC

CONDITION

MIN. TYP. MAX. UNIT

2.8

5.5

1.5

V_CC= 3.6V, V_CTL=3.6V

0.9

0.5

320

1.1

400

0.7

0.5

150

I_CC

Supply Current

V_CTL= 0V

294

V_FB

I_CTL

Feedback Voltage

346

V_CC=V_CTL=3.0V, T_opr= 25 , L =10 H

V_CC= 3.0V, V_CTL= 3.0V

V_CTL= 3.0V

CTL Pin Bias Current

Switching Frequency

Switching Pin Current

Switch RDS(ON)

f_OSC

0.77

1.43

I_O(SW)

R_ON

1.5

I_O(SW)400

I_OZ(SW)

V_OVD

I_OZ(OVD)

TSD

Switch Leak Current

OVD Pin Voltage

OVD Pin Leak Current

Thermal Shutdown

180

V_O(SW)

V_{CTL H}

V_{CTL L}

I_FB

Switching Pin OVP

2.7

CTL pin voltage for Full LED Current

CTL pin voltage to shutdown Chip

Feedback Bias Current

Maximum Duty Cycle

V_CC= 3.0V

0.5

D_max

PIN FUNCTIONS

NO.

SYMBOL

FUNCTION AND CONNECTION.

Control pin : Shutdown or dimming control. Connect external enable or dimming circuits.

Shutdown mode (IF = 0) : V_CTL<1.0V

CTL

Dimming control mode : (IF = 20% ~ 100%, depend on V_CTL

)

1.0V < V_CTL< 2.5V, when V_CTLis above 2.5V IF keep its maximum value(100%).

Filtered PWM signal, above 33us of pulse width, can be used for dimming control.

OVD

Over output voltage detect pin. Connect cathode of schottky diode and anode of highest LED.

Switch pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.

Feedback pin. Reference voltage is 320mV. Connect cathode of lowest LED and resistor here.

Ground pin. Connect directly to local ground plane,

GND

V_CC

Input supply pin. Must be locally bypassed.

2006. 4. 20

Revision No : 0

3/6

KIB3402F

The KIB3402F will then switch at a high duty cycle resulting in a

APPLICATION INFORMATION

high output voltage, but Internal Over Voltage Protection Circuits

prevent output voltage ascending over OVD pin voltage( 16V ~ 22V

see Fig.4 ). This circuits is valid when driving up to 4 LEDs in

series. But, when driving more than 4 LEDs in series, Normal

output voltage could be over OVD pin voltage.

Inductor Selection

A 4.7 H inductor is sufficient for most application. The efficiency

comprison of different value inductors help you design your

application circuits.

In this case, zener diode can be used to limit output voltage, but

check connection of OVD pin to VCC.(see Fig.5)

90.00

Vin=3.6V, 4LED

88.00

Inductor=Murata

86.00

84.00

82.00

80.00

78.00

76.00

4.7 H~10

LED1

LED2

LED3

LED4

OVD

74.00

72.00

1µF

4.7uH

10uH

KIB3402F

70.00

CTL

1µF

LOAD CURRENT (mA)

GND

Figure3. Efficiency Comaprison of different value inductors

Capacitor Selection

A 1

input capacitor and output capacitor above 1

are

sufficient for most KIB3402F application.

Figure4. 4LEDs driver with Open-circuit protection.

Diode Selection

4.7 H~10

For Diode Selection, both forward voltage drop and diode

capacitance need to be considered. Shottky diodes with higher

current ratings usually have lower forward voltage and larger diode

capacitance, which can cause significant switching losses. A

schottky diode rated at 100 to 200 is sufficient for most

KIB3402F applications.

LED1

LED2

LED3

LED4

LED5

OVD

CTL

1µF

KIB3402F

Reverse

Forward

Voltage

Part No.

Package

Voltage (V) Current (mA) Drop (V)

LED6

1.60

1.20

1µF

0.6V (max)

at 200 mA

KDR730E

200 mA

500 mA

GND

16Ω

1.60

1.20

0.5V(max)

at 200 mA

KDR720E

KDR412

2.50

1.70

0.5V(max)

at 500 mA

Figure5. 6LEDs driver with Open-circuit protection.

Table 1. Recommended Schottky Diodes

Dimming Control

There are 4 different type of dimming control circuits:

LED Current Control

The LED current is controlled by the feedback resistor(R_SENSEin

1. Using a DC Voltage to CTL pin.

V_CTL

Figure 1). The feedback reference is 320

The LED current is 320 /R_SENSE. The tolerance of LED Current is

depends on tolerance of R_SENSEand feedback reference.

Description

UNIT

V_CTL>2.5V

0V~0.5V 1V~2.5V

Rate Of the LED Current

Example : R_SENSE= 16

25 ~ 100

5 ~ 20

100

Open-Circuits Protection

In the case of output open circuit, when LEDs are disconnected

from the circuit or the LEDs fail, the feedback voltage will be zero.

Table 2 CTL pin Voltage vs I_LED

2006. 4. 20

Revision No : 0

4/6

KIB3402F

4.7 H~10

Vsw

5V/Div

LED1

LED2

LED3

LED4

1µF

OVD

1µF

CTL

KIB3402F

2V/Div

CTL

GND

(A) 1kHz (2ms/Div)

Figure 7. Using a PWM Signal to CTL pin.

3. Using a DC Voltage to FB pin.

Figure6. Using a DC Signal to CTL pin.

The dimming control using a DC control voltage to FB pin of the

KIB3402F is shown in Figure. The LED current can be varied

applying a DC voltage to the FB pin. The voltage can come from a

filtered PWM signal. It can be used to replace the variable DC

Voltage source in dimming control.

2. Using a PWM Signal to CTL pin.

With the PWM signal applied to the CTL pin, the KIB3402F is turned

on or off by the signal. Typical frequency range of the PWM signal is

15kHz to 30kHz. The switching waveforms of the CTL pin PWM

control are shown in Figure 7(A) and 7(B)

4.7 H~10

LED1

LED2

LED3

OVD

1µF

LED1

LED2

LED3

LED4

1µF

KIB3402F

OVD

LED4

CTL

1µF

KIB3402F

1µF

GND

PWM

CTL

GND

Figure8. Using DC Voltage to FB pin.

4. Using a Logic Signal to FB pin.

For applications that need to adjust the LED current in discret steps,

a logic signal can be used as shown in Figure 9.

Vsw

5V/Div

LED1

LED2

LED3

LED4

CTL

OVD

2V/Div

1uF

KIB3402F

CTL

(A) 1kHz (2ms/Div)

KTK5132V

LOGIC

dim

1uF

GND

SENSE

Figure9. Using a Logic Signal to FB pin.

2006. 4. 20

Revision No : 0

5/6

KIB3402F

Efficicncy vs Temperature

V_FBvs V_CTL

350

300

250

200

150

100

Vin=4.3V

Vin=3.6V

Vin=3.0V

-60

-10

140

(V)

Temperature ( C)

CTL

Switching Frequency vs Temperature

Frequency vs Vcc

1.01

1.00

0.99

0.98

0.97

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.96

0.95

0.94

0.93

0.92

0.91

1.5

2.5

3.5

4.5

Vcc (V)

5.5

6.5

-50

100

Temperature ( C)

Quiescent Current vs Temperature

Thermal Shut Down

500

400

300

200

100

400

350

300

250

200

150

100

-50

-10

110

105 115 125 135 145 155 165 175 185

TEMP ( C)

2006. 4. 20

Revision No : 0

6/6

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