KIB3401F [KEC]
BICD LINEAR INTEGRATED CIRCUIT; BICD线性集成电路
| 型号： | KIB3401F |
| 厂家： | 
KEC(KOREA ELECTRONICS) |
| 描述： | BICD LINEAR INTEGRATED CIRCUIT |
| 文件： | 总6页 (文件大小：477K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SEMICONDUCTOR
KIB3401F
BICD LINEAR INTEGRATED CIRCUIT
TECHNICAL DATA
White LED Step-Up Converter
The KIB3401F 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.
E
K
1
B
K
6
DIM MILLIMETERS
_
A
B
C
D
E
2.9+0.2
KIB3401F is available in a extremely low profile & small TS-6 package.
A 10 H inductor is sufficient for most application.
1.6+0.2/-0.1
_
0.70+0.05
_
+
0.4 0.1
2
5
2.8+0.2/-0.3
3
4
_
1.9+0.2
F
G
H
I
FEATURES
0.95
Inherently Matched LED Current.
_
0.16+0.05
0.00-0.10
0.25+0.25/-0.15
0.60
High Efficiency : 85% (max.)
J
K
L
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.
0.55
I
H
J
J
Bulit in Thermal protection.
TS6
Wide Dimming control range : 25%~100%.
Extremely low height & small Packaging.
Marking
APPLICATIONS
Celluars Phones
PDAs
6
5
4
Lot No.
Type Name
Digital Cameras
MP3 Players, Color Displays
401
1
2
3
TYPICAL APPLICATION
L1
4.7 H~10
CONVERSION EFFICIENCY
D1
µ
µ
H
V
IN
87.00
85.00
83.00
81.00
79.00
77.00
75.00
LED1
LED2
LED3
LED4
3
6
C1
1µF
V
SW
CC
OVD
2
C2
1µF
KIB3401F
ON
OFF
CTL
1
FB
4
Shutdown and
Dimming control
Vin
3.0V
GND
5
R1
21.5Ω
3.6V
4.3V
0
5
10
15
20
25
0
LOAD CURRENT (mA)
C1, C2 : X5R OR X7R DIELECTRIC
D1 : KEC KDR730E/KDR720E (Low V )
F
L1 : MURATA LQH32CN100K53L OR EQUIVALENT
Figure1. 4Series White LED Driver in Thin TS6
2006. 4. 13
Revision No : 3
1/6
KIB3401F
BLOCK DIAGRAM
V
CC
SW
3
6
OVD
2
+
One Shot
-
+
+
OUT
-
-
+
-
VRef
_
OUT
One Shot
+
+
Vth
_
+
+
-
-
320mV
1
CTL
ADC
5
4
GND
FB(Rsense)
figure 2. KIB3401F Block Diagram
MAXIMUM RATINGS (Ta=25
)
CHARATERISTICS
SYMBOL
VCC
RATING
UNIT
Input Voltage
-0.3 ~ 6.0
-0.3 ~ 22
-0.3 ~ 22
-40 ~ 85
-40 ~ 150
150
V
V
V
VSW
Switching pin Voltage
VOVD
Topr
Tstg
OVD pin Voltage
Operating temperature range
Storage temperature range
Maximum Junction temperature
Tj
RECOMMENDED OPERATING CONDITIONS (Topr=-40~85
)
CHARATERISTICS
Input Voltage
SYMBOL
VCC
CONDITION
MIN.
2.8
2.7
-
TYP.
MAX.
UNIT
-
-
-
-
-
5.5
-
V
V
V
VCTL
VCTL
H
L
CTL pin voltage for full LED current
CTL pin voltage to shutdown chip
CTL pin input pulse width
VCC=3.0V
0.5
-
tPW(CTL)
IF
Both Positive and Negative pulse
33
VCC=3.6V, RSENSE=16
Topr =25 , Four LED
,
LED Current
-
20
-
-
-
CTL Response Delay
(When Power ON.)
Tpd CTL
-
2
2006. 4. 13
Revision No : 3
2/6
KIB3401F
ELECTRICAL CHARACTERISTIC
(Topr=-40~85 , VCC=2.8~5.5V, RSENSE=16 , unless otherwise noted.)
CHARATERISTICS
Input Voltage
SYMBOL
VCC
CONDITION
-
MIN. TYP. MAX. UNIT
2.8
-
5.5
1.5
1
V
VCC = 3.6V, VCTL=3.6V
-
0.9
0.5
320
20
1.1
400
0.7
0.5
20
0.5
150
-
ICC
Supply Current
VCTL = 0V
-
294
-
VFB
ICTL
Feedback Voltage
346
-
VCC=VCTL=3.0V, Topr = 25 , L =10 H
VCC = 3.0V, VCTL = 3.0V
VCTL = 3.0V
CTL Pin Bias Current
Switching Frequency
Switching Pin Current
Switch RDS(ON)
fOSC
0.77
-
1.43
-
IO(SW)
RON
-
1.5
1
IO(SW) 400
IOZ(SW)
VOVD
IOZ(OVD)
TSD
Switch Leak Current
-
-
-
-
-
-
OVD Pin Voltage
16
-
22
1
V
OVD Pin Leak Current
Thermal Shutdown
-
180
-
VO(SW)
VCTL H
VCTL L
IFB
Switching Pin OVP
25
2.7
-
V
V
V
CTL pin voltage for Full LED Current
CTL pin voltage to shutdown Chip
Feedback Bias Current
Maximum Duty Cycle
-
-
VCC = 3.0V
-
0.5
1
-
-
-
0.5
90
Dmax
85
-
%
PIN FUNCTIONS
NO.
SYMBOL
FUNCTION AND CONNECTION.
Control pin : Shutdown or dimming control. Connect external enable or dimming circuits.
Shutdown mode (IF = 0) : VCTL<1.0V
1
CTL
Dimming control mode : (IF = 20% ~ 100%, depend on VCTL
)
1.0V < VCTL < 2.5V, when VCTL is above 2.5V IF keep its maximum value(100%).
Filtered PWM signal, above 33us of pulse width, can be used for dimming control.
2
3
4
5
6
OVD
SW
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,
FB
GND
VCC
Input supply pin. Must be locally bypassed.
2006. 4. 13
Revision No : 3
3/6
KIB3401F
The KIB3041F 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 10 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
L1
4.7 H~10
D1
µ
µ
H
V
IN
LED1
LED2
LED3
LED4
6
3
V
SW
CC
OVD
2
4
C2
1µF
74.00
72.00
4.7uH
10uH
KIB3401F
70.00
CTL
1
0
5
10
15
20
25
FB
C1
1µF
GND
5
LOAD CURRENT (mA)
Figure3. Efficiency Comaprison of different value inductors
Capacitor Selection
0
A 1
input capacitor and output capacitor above 1
are
sufficient for most KIB3401F application.
Figure4. 4LEDs driver with Open-circuit protection.
Diode Selection
L1
4.7 H~10
D1
µ
µ
H
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
KIB3401F applications.
V
IN
LED1
LED2
LED3
LED4
LED5
6
3
V
CC
SW
OVD
CTL
2
1
C2
1µF
KIB3401F
Reverse
Forward
Voltage
Part No.
Package
Voltage (V) Current (mA) Drop (V)
LED6
FB
1.60
1.20
4
C1
1µF
0.6V (max)
at 200 mA
KDR730E
30
30
20
200 mA
200 mA
500 mA
GND
5
R1
16Ω
1.60
1.20
0.5V(max)
at 200 mA
KDR720E
KDR412
0
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(RSENSE
1. Using a DC Voltage to CTL pin.
VCTL
in Figure 1). The feedback reference is 320
.
The LED current is 320 /RSENSE. The tolerance of LED Current is
depends on tolerance of RSENSE and feedback reference.
Description
UNIT
VCTL>2.5V
0V~0.5V 1V~2.5V
Rate Of the LED Current
Example : RSENSE = 16
0
0
25 ~ 100
5 ~ 20
100
20
%
Open-Circuits Protection
mA
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 ILED
2006. 4. 13
Revision No : 3
4/6
KIB3401F
L1
4.7 H~10
D1
µ
µ
H
V
IN
LED1
LED2
LED3
LED4
6
3
SW
C1
1µF
V
CC
OVD
2
4
C2
1µF
KIB3401F
DC
CTL
1
FB
GND
5
Figure 7. Using a PWM Signal to CTL pin.
0
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
KIB3401F 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 KIB3401F 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)
D1
L1
V
IN
L1
4.7 H~10
D1
µ
µ
H
LED1
LED2
LED3
6
3
V
IN
V
SW
CC
OVD
2
4
LED1
LED2
LED3
LED4
C2
1µF
6
3
C1
1µF
V
SW
CC
KIB3401F
OVD
2
4
LED4
R1
CTL
1
C2
1µF
FB
KIB3401F
C1
1µF
GND
5
PWM
R2
1
CTL
FB
GND
5
0
0
0
0
DC
Figure8. Using DC Voltage to FB pin.
0
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.
D1
L1
VSW
5V/Div
V
IN
LED1
LED2
LED3
LED4
6
3
SW
V
CC
OVD
2
4
C2
1uF
VCTL
5V/Div
KIB3401F
CTL
1
FB
KTK5132V
LOGIC
R
dim
C1
1uF
GND
5
R
SENSE
(A) 1kHz (2ms/Div)
0
Figure9. Using a Logic Signal to FB pin.
2006. 4. 13
Revision No : 3
5/6
KIB3401F
Efficicncy vs Temperature
VFB vs VCTL
95
90
85
80
75
70
65
60
55
50
350
300
250
200
150
100
V
FB
Vin=4.3V
Vin=3.6V
Vin=3.0V
50
0
0
1
2
3
4
5
-60
-10
40
90
140
V
(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
f
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
0
50
100
Temperature ( C)
Quiescent Current vs Temperature
Thermal Shut Down
500
400
300
200
100
0
400
350
300
250
200
150
100
50
0
-50
-10
30
70
110
105 115 125 135 145 155 165 175 185
TEMP ( C)
TEMP ( C)
2006. 4. 13
Revision No : 3
6/6
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