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參數(shù)資料
| 型號： | LQH32C |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Dual Micropower DC/DC Converters with Schottky Diodes |
| 中文描述： | 雙微功率DC / DC轉換的肖特基二極管 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 193K |
| 代理商： | LQH32C |
4
LT3463/LT3463A
3463f
BLOCK DIAGRA
W
Figure 1. Block Diagram
OPERATIOU
The LT3463 uses a constant off-time control scheme to
provide high efficiency over a wide range of output cur-
rent. Operation can be best understood by referring to the
block diagram in Figure 1. When the voltage at the FB1 pin
is slightly above 1.25V, comparator A1 disables most of
the internal circuitry. Output current is then provided by
capacitor C2, which slowly discharges until the voltage at
the FB1 pin goes below the hysteresis point of A1 (typical
hysteresis at the FB1 pin is 8mV). A1 then enables the
internal circuitry, turns on power switch Q1, and the
current in inductor L1 begins ramping up. Once the switch
current reaches 250mA, comparator A2 resets the one-
shot, which turns off Q1 for 300ns. Q1 turns on again and
the inductor currents ramp back up to 250mA, then A2
again resets the one-shot. This switching action continues
until the output voltage is charged up (until the FB1 pin
reaches 1.25V), then A1 turns off the internal circuitry and
the cycle repeats. The second switching regulator is an
inverting converter (which generates a negative output)
but the basic operation is the same.
SHDN1 (Pin 9):
Shutdown Pin for Switcher 1. Pull this pin
above 1.5V to enable Switcher 1. Pull below 0.3V to turn
it off. Do not leave this pin floating.
FB1 (Pin 10):
Feedback Pin for Switcher 1. Set the output
voltage by selecting values for R1 and R2.
GND (Pin 11):
Exposed Pad. Solder this exposed pad
directly to the local ground plane. This pad must be
electrically connected for proper operation.
PIU
–
+
–
+
–
+
3
300ns
ONE-SHOT
25mV
LT3463: R
S1
= R
= 0.1
LT3463A: R
S1
= 0.1
, R
S2
= 0.063
25mV
1.25V
1.25V
A2
A1
Q1
10
V
IN
FB1
FB2
1
V
OUT1
V
OUT1
SW1
3463 F01
L1
V
IN
V
IN
R1
R2
V
OUT1
V
OUT2
V
REF
R4
R3
C1
C2
V
OUT2
C3
–
+
300ns
ONE-SHOT
A4
A3
Q2
11
8
4
7
6
5
SW2
GND
D2
D2
D1
D3
SWITCHER 1
SWITCHER 2
L2
2
C4
SHDN2
SHDN2
9
SHDN1
SHDN1
R
S1
R
S2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LQH32C_23 | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Chip Inductor for Automotive (Chip Coil for Automotive) Power Inductor (Wire Wound Type for Choke) |
| LQH32C_33 | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Chip Inductor for Automotive (Chip Coil for Automotive) Power Inductor (Wire Wound Type for Choke) |
| LQH32CH100K23B | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Chip Inductor for Automotive (Chip Coil for Automotive) Power Inductor (Wire Wound Type for Choke) |
| LQH32CH100K23K | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Chip Inductor for Automotive (Chip Coil for Automotive) Power Inductor (Wire Wound Type for Choke) |
| LQH32CH100K23L | 功能描述:固定電感器 10uH 10% 1MHz RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
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