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KB3440 Datasheet(PDF) 15 Page - Kingbor Technology Co

Part # KB3440
Description  Micropower Synchronous Buck-Boost DC/DC Converter
PDF  20 Pages
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Manufacturer  KINGBOR [Kingbor Technology Co]
Direct Link  http://www.kingbor.com
Logo KINGBOR - Kingbor Technology Co

KB3440 Datasheet(HTML) 15 Page - Kingbor Technology Co

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15
Figure 10. Simple Input Current Control
Utilizing the Voltage Loop
3-Cell to 3.3V at 600mA Converter
SW1
VIN
SHDN/SS
MODE/SYNC
RT
SW2
VOUT
FB
VC
GND
3
7
8
2
1
4
6
9
10
5
kB3440
L1
4.7
µH
D1
R3 15k
R5
10k
R1
340k
R2
200k
RT
45.3k
fOSC = 1.5MHz
C1: TAIYO YUDEN JMK212BJ106MG
C2: TAIYO YUDEN JMK325BJ226MM
D1, D2: CENTRAL SEMICONDUCTOR CMDSH2-3
L1: SUMIDA CDR43-4R7M
*1 = Burst Mode OPERATION
0 = FIXED FREQUENCY
C1
10
µF
3 CELLS
VIN = 2.7V TO 4.5V
*
C4 150pF
C3
33pF
D2
C5 10pF
C2
22
µF
VOUT
3.3V
600mA
+
OUTPUT CURRENT (mA)
30
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
0
1
Burst Mode
OPERATION
VIN = 2.7V
VIN = 3.3V
fOSC = 1.5MHz
VIN = 4.5V
3-Cell to 3.3V Efficiency
INPUT_VOLTAGE
FB_PIN
VIN_PIN
Q1
2N3906
R1
0.5
C1
10
µF
V1
Simple Average Input Current Control
A simple average current limit circuit is shown in
Figure 10. Once the input current of the IC is above
approximately 1A, Q1 will start sourcing current into the
FB pin and lower the output voltage to maintain the
average input current. Since the voltage loop is utilized to
perform average current limit, the voltage control loop is
maintained and the VC voltage does not slam. The averag-
ing function of current comes from the fact that voltage
loop compensation is also used with this circuit.
kB3440
Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
APPLICATIONS INFORMATION
TYPICAL APPLICATION



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