參數(shù)資料
型號(hào): DS21Q48N
廠商: DALLAS SEMICONDUCTOR
元件分類: Digital Transmission Interface
英文描述: DATACOM, PCM TRANSCEIVER, PBGA144
封裝: BGA-144
文件頁數(shù): 15/16頁
文件大?。?/td> 296K
代理商: DS21Q48N
MAX863
Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
8
_______________________________________________________________________________________
MAX863
EXT2
CS2
VOUT2 = 12V
VOUT1 = 5V
VIN = 2.7V TO THE LOWER OF VOUT1 OR VOUT2
N1.B
IRF7301
C7
0.1
F
R4
115k
1%
C8
82pF
C6
10pF
1M
C5
100
F
20V
≤0.1
R2
50m
R3
1M
1%
N1.A
R1
50m
R7
100k
C1
220
F
10V
≤0.1
R5
R6
D1
MBRS340T3
D2
MBRS340T3
L1
10
H
2A
L2
10
H
2A
C3
100
F
10V
≤0.1
C4
100
F
10V
≤0.1
C2
0.1
F
ON/OFF
FB2
SHDN1
EXT1
CS1
LBO
LOW-BATTERY
DETECTOR OUTPUT
LBI
SENSE1
PGND
VDD
GND
FB1
SHDN2
REF
BOOT
Figure 4a. Non-Bootstrapped Typical Operating Circuit
Figures 3a–3f. MAX863 Switching Waveforms During Transition into Continuous Conduction
A
B
C
A
B
C
VOUT1 = 3.3V
PLOTS a-d: INTERNAL FEEDBACK
PLOTS e-f: UNCOMPENSATED,
EXTERNAL FEEDBACK
A: MOSFET DRAIN, 2V/div
B: VOUT1, 100mV/div, 3.3V DC OFFSET
C: INDUCTOR CURRENT, 1A/div
20
s/div
a) IOUT1 = 287mA
20
s/div
b) IOUT1 = 608mA
20
s/div
c) IOUT1 = 767mA
OV
3.3V
0A
OV
3.3V
0A
20
s/div
d) IOUT1 = 1.01A
20
s/div
e) IOUT1 = 757mA
20
s/div
f) IOUT1 = 881mA
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