参数资料
| 型号： | LT3750EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER 10-MSOP |
| 标准包装： | 50 |
| 类型： | 回扫，正向转换器 |
| 应用： | 电源控制器 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 1338 (CN2011-ZH PDF) |
| 相关产品： | 732-2128-6-ND - TRANS POWR FOR LT3751/LT3750 SMD 732-2128-1-ND - TRANS POWR FOR LT3751/LT3750 SMD 732-2128-2-ND - TRANS POWR FOR LT3751/LT3750 SMD |
8
LT3750
3750fa
APPLICATIO S I FOR ATIO
WU
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Safety Warning
Large capacitors charged to high voltage can deliver a
lethal amount of energy if handled improperly. It is par-
ticularly important to observe appropriate safety mea-
sures when designing the LT3750 into applications. First,
create a discharge circuit that allows the designer to safely
discharge the output capacitor. Second, adequately space
high voltage nodes from adjacent traces to satisfy printed
circuit board voltage breakdown requirements. High volt-
age nodes are the drain of the NMOS, the secondary side
of the transformer, and the output.
Transformer Selection
The flyback transformer is critical to proper operation of
the LT3750. It must be designed carefully so that it does
not cause excessive current or voltage on any pin of the
part.
As with all circuits, the LT3750 has finite bandwidth. In
order to give the LT3750 sufficient time to detect the
output voltage, observe the following restrictions on the
primary inductance:
L
Vs
NI
PRI
OUT
PK
≥
1
otherwise, the LT3750 may overcharge the output.
Linear Technology has worked with several leading mag-
netic component manufacturers to produce flyback trans-
formers for use with the LT3750. Table 1 summarizes the
particular transformer characteristics.
Switching Period
The LT3750 employs an open-loop control scheme caus-
ing the switching period to decrease with output voltage.
Typical switching frequency is between 100kHz to 300kHz.
Figure 3 shows typical switching period in an application
with a 3A peak current.
VOUT (V)
0
TIME
(
s)
4
8
12
16
20
50
100
150
200
3750 F03
250
300
Figure 3. Typical Switching Period vs VOUT
Table 1. Recommended Transformers
MANUFACTURER
PART NUMBER
SIZE L
× W × H (mm)
MAXIMUM IPRI (A)
LPRI (H)
TURNS RATIO (PRI:SEC)
TDK
DCT15EFD-U44S003
22.5
× 16.5 × 8.5
5
10
1:10
(www.tdk.com)
DCT20EFD-U32S003
30
× 22 × 12
10
1:10
Sumida
C8118 Rev P1
21
× 14 × 8
3
10
1:10
(www.sumida.com)
C8117 Rev P1
23
× 18.6 × 10.8
5
10
1:10
C8119 Rev P1
32.3
× 27 × 14
10
1:10
Midcom
32050
23.1
× 18 × 9.4
3
10
1:10
(www.midcom.com)
32051
28.7
× 22 × 11.4
5
10
1:10
32052
28.7
× 22 × 11.4
10
1:10
Coilcraft
DA2032-AL
17.2
× 22 × 8.9
3
10
1:10
(www.coilcraft.com)
DA2033-AL
17.4
× 24.1 × 10.2
5
10
1:10
DA2034-AL
20.6
× 30 × 11.3
10
1:10
Output Diode Selection
When choosing the rectifying diode, ensure its peak
repetitive forward current rating exceeds the peak cur-
rent (IPK/N) and that the peak repetitive reverse voltage
rating exceeds VOUT + (N)(VTRANS). The average current
through the diode varies during the charge cycle because
the switching period decreases as VOUT increases. The
average current through the diode is greatest when the
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3751 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Capacitor Charger Controller with Regulation |
| LT3751EFE#PBF | 功能描述:IC CTRLR CAP CHRGR 20-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:热电冷却器 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商设备封装:28-TSSOP 裸露焊盘 包装:管件 产品目录页面:1410 (CN2011-ZH PDF) |
| LT3751EFE#PBF | 制造商:Linear Technology 功能描述:; Leaded Process Compatible:Yes; Peak Re |
| LT3751EFE#TRPBF | 功能描述:IC CTRLR CAP CHARGER 20-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LT3751EUFD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Capacitor Charger Controller with Regulation |
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