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參數(shù)資料
| 型號： | MAX746MJE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Parallel-Load 8-Bit Shift Registers 16-CDIP -55 to 125 |
| 中文描述： | SWITCHING CONTROLLER, CDIP16 |
| 封裝： | CERDIP-16 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 157K |
| 代理商： | MAX746MJE |
M
High-Effic ienc y, PWM, S tep-Down,
N-Channel DC-DC Controller
______________________________________________________________________________________
11
__________________Design Proc edure
S etting the Output V oltage
The MAX746’s dual-mode output voltage can be set
to 5V by grounding FB, or it can be adjusted from
2V to 14V using external resistors R4 and R5 config-
ured as shown in Figure 6. Select feedback resistor
R4 in the 10k
to 60k
range. R5 is given by:
OUT
R5 = (R4)
(
_V
)
2V
The MAX746 is designed to use either internal or exter-
nal feedback mode, but should not be toggled between
the two modes while operating. If two different output
voltages are required, use external feedback mode
with a resistor network similar to the 3.3V/5V adjustable
output circuit shown in Figure 7.
S elec ting R
S ENS E
To select the sense-resistor value (R
SENSE
), first
approximate the peak current assuming I
PK
is
(1.1) (I
LOAD
), where I
LOAD
is the maximum load cur-
rent. Once all component values have been deter-
mined, the actual peak current is given by:
OUT
(2L) (f
OSC
)
OUT
V
IN
I
PK
= I
LOAD
+
(
___V
)(
1– V
)
V+
CP
HIGH
D2
1N914
C8
0.1
μ
F
14
13
D3
1N914
C9
1
μ
F
C10
0.1
μ
F
D5
1N914
D6
1N914
15
16
D4
1N5817
C11
1
μ
F
V
IN
CP
HIGH
14
13
16
V+
15
C8
0.1
μ
F
D2
1N914
D3
1N914
C9
1
μ
F
V
IN
100kHz
OSCILLATOR
T FLIP-
FLOP
5V
Q
AV+
3b. CHARGE-PUMP
VOLTAGE TRIPLER
GND
GND
T
CLK
MAX746
MAX746
3a. CHARGE-PUMP
VOLTAGE DOUBLER
D4
1N5817
Figure 3. Charge-Pump Configurations
PEAK CURRENT LIMIT
vs. SOFT-START VOLTAGE
P
0
1
2
3
0
1
SOFT-START VOLTAGE (V)
2
3
4
R
SENSE
= 50m
M
V+ - V
CS
= 150mV
R
SENSE
= 100m
Figure 4. Peak Current Limit vs. Soft-Start Voltage
R
2
= R1 V
V
REF
= 2.0V
GND
V+
LBO
15
1
16
…
TOV
OUT
OR V
IN
R3
100k
REF
V
TRIP
2
R2
R1
LOW-BATTERY
OUTPUT
V
IN
LBI
MAX746
Figure 5. Input Voltage Monitor Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX747 | Parallel-Load 8-Bit Shift Registers 16-CFP -55 to 125 |
| MAX747CPD | Parallel-Load 8-Bit Shift Registers 16-CFP -55 to 125 |
| MAX747CSD | Parallel-Load 8-Bit Shift Registers 20-LCCC -55 to 125 |
| MAX747EPD | Parallel-Load 8-Bit Shift Registers 16-CDIP -55 to 125 |
| MAX747ESD | Parallel-Load 8-Bit Shift Registers 16-CFP -55 to 125 |
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