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부품번호 | KB3386 기능 |
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기능 | 400mA Buck/Boost Charge Pump LED Driver | ||
제조업체 | Kingbor Technology | ||
로고 | |||
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3386
400mA Buck/Boost Charge Pump LED Driver
FEATURES
■ Output Current up to 400mA
■ Up to 94% Efficiency in Torch Mode
■ Automatic Softstart Limits Inrush Current
■ Adjustable FLASH Mode
www.DataSheet■4U.xco1mand x2 Automatic Modes for High Efficiency
■ Minimum External Components: No Inductors
■ High Frequency Operation: 2.4 MHz
■ Low 50mV Reference for low Loss Sensing
■ 1+A Shutdown Current
■ PWM Dimming Control
■ Automatic Switchover Between Buck/Boost
■ Overvoltage Protection on Output
■ Overcurrent/Temerature Protection
■ Low Ripple and EMI
■ Space Saving 10-pin 3mm x 3mm DFN
Package
DESCRIPTION
The KB3386 is a current regulated charge pump ideal for
powering high brightness LEDs for camera flash applications.
The charge pump can be set to regulate two current levels for
FLASH and TORCH modes. The KB3386 automatically switches
modes between step-up and step-down ensuring that
LED current does not depend on the forward voltage. A low
current sense reference voltage (50mV) allows the use
of small 0603 current sensing resistors. The KB3386 is .
offered in 10-pin DFN package.
APPLICATIONS
■ White LED Torch/Flash for Cell
Phones, DSCs, and Camcorders
■ Generic Lighting/Flash/Strobe
Applications
■ White LED Backlighting
VIN 1
C1 2
C2 3
FLASH 4
EN 5
10
KB3386 9
8
10 Pin DFN
7
6
VOUT
PGND
SGND
IFB
ISET
Now Available in Lead Free Packaging
APPLICATION CIRCUIT
VIN
(2.7 - 5.5V)
CIN
2.2+F
CFC
0.47+F
TORCH/FLASH
ENABLE
1 VIN
VOUT 10
2 C1 KB3386 PGND 9
3 C2
SGND 8
4 FLASH
FB 7
5 EN
RSET 6
400mA FLASH
COUT
1+F
WLED
FB=150mV
RSET
106K 1
RSENSE
0.331
1
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3386
400mA Buck/Boost Charge Pump LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6, Typical Application, TA = 25°C unless otherwise noted. D1 = AOT 2015HPW-1915B LED.
Torch Mode 150mA Iout
250
200
150
www.DataSheet4U.com100
Vf = 3.5V
Vf = 3.3V
50 Vf = 3.1V
Vf = 3.0V
0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
Vin (V)
Figure 1. Output Current vs. Supply Voltage (CIN =
2.2+F, CFC = 0.47+F, COUT = 1.0+F
Flash Mode 400mA Iout
600
500
400
300 Vf = 4.1V
200 Vf = 3.8V
Vf = 3.5V
100
Vf = 3.2V
0
3.0 3.2 3.4 3.6 3.8 4.0 4.2
VIN (V)
Figure 2. Output Current vs. Supply Voltage (CIN =
2.2+F, CFC = 0.47+F, COUT = 1.0+F
100
90
80
70
60
50
40
3.0
Torch Mode 150mA Efficie
Vf = 3.5V
Vf = 3.3V
Vf = 3.1V
Vf = 3.0V
3.2 3.4 3.6 3.8 4.0
Vin (V
4.2
Figure 3. Efficiency vs. Supply Voltage (CIN = 2.2+F,
CFC = 0.47+F, COUT = 1.0+F)
Flash Mode 400mA Efficie
100
Vf = 4.1V
90 Vf = 3.8V
80 Vf = 3.5V
Vf = 3.2V
70
60
50
40
3.0 3.2 3.4 3.6 3.8 4.0 4.2
Vin (V
Figure 4. Efficiency vs. Supply Voltage (CIN = 2.2+F,
CFC = 0.47+F, COUT = 1.0+F)
Recommended PCB Layout
4
4페이지 Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3386
400mA Buck/Boost Charge Pump LED Driver
APPLICATION INFORMATION
The KB3386 charge pump circuit requires 3
capacitors: 4.7+F input, 1+F output and
0.47+F fly capacitor are typically recom-
mended. For the input capacitor, a larger
value of 10+F will help reduce input voltage
ripple for applications sensitive to ripple on
www.DataSheet4U.comthe battery voltage. All the capacitors
should be ceramic to obtain low ESR, which
improves bypassing on the input and output
and improves output voltage drive by reduc-
ing output resistance. X5R or X7R Ceramic
capacitors are recommended for most ap-
plications. A selection of recommended ca-
pacitors is included in Table 1. The input
and output capacitors should be located as
close to the VIN and VOUTpins as possible to
obtain best bypassing, and the returns
should be connected directly to the PGND pin
or to the thermal pad ground located under
the KB3386. The fly capacitor should be
located as close to the C1 and C2 pins as
possible.
The sense resistor Rsense is determined by
the value needed in the Torch mode for the
desired output current by the equation:
R = V / I where V = 50mV (Torch
SENSE
FB OUT
FB
Mode)
Once the RSENSE resistor has been selected
for Torch mode, the VFB voltage can be
selected for Flash mode using the following
equation:
VFB = IOUT *RSENSE (Flash Mode) where IOUT is
for Flash Mode
Next, the RSET resistor can be selected for
Flash mode using the following equation:
RSET = (1.26V/ VFB)*11.2K1 (Flash Mode)
For an example of 150mA Torch mode and
400mA Flash mode, the values RSENSE =
0.331, VFB = 135mV (Flash Mode), and RSET
= 106K1 are calculated. The power ob-
tained in the Flash mode would be:
PFLASH = VFB *IOUT = 133mV*400mA = 53mW.
The typical 0603 surface mount resistor is
rated at 1/10 Watt continuous power and
1/5 Watt pulsed power, more than enough
for this application. For other applications,
the PFLASH can be calculated from the resis-
tor size selected. The R resistor is
SENSE
recommended to be size 0603 for most
applications.
Part Reference
RSET
RSET
RSET
RSET
RSET
RSET
RSET
RSET
RSET
RSET
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
Value
68k
75k
82k
91k
100k
110k
120k
130k
140k
150k
0.22
0.27
0.33
0.39
0.47
Tolerance
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
Size
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0603
0603
0603
0603
0603
Manufacturers
any
any
any
any
any
any
any
any
any
any
Panasonic or Vishay
Panasonic or Vishay
Panasonic or Vishay
Panasonic or Vishay
Panasonic or Vishay
Table 2: Resistor values and sizes
7
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부품번호 | 상세설명 및 기능 | 제조사 |
KB3386 | 400mA Buck/Boost Charge Pump LED Driver | Kingbor Technology |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |