- 您现在的位置：买卖IC网 > PDF目录14795 > LT1377IS8#PBF (Linear Technology)IC REG MULTI CONFIG ADJ 8SOIC PDF资料下载
参数资料
| 型号： | LT1377IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压），升压（升压），反相，Cuk，回扫，正向转换器 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 35 V |
| 输入电压： | 2.7 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
LT1372/LT1377
APPLICATIO S I FOR ATIO
Table 1. Surface Mount Solid Tantalum Capacitor
ESR and Ripple Current
E CASE SIZE ESR (MAX ? ) RIPPLE CURRENT (A)
I RIPPLE =
0.3(V IN )(V OUT – V IN )
(f)(L)(V OUT )
AVX TPS, Sprague 593D
AVX TAJ
0.1 to 0.3
0.7 to 0.9
0.7 to 1.1
0.4
f = 500kHz Switching frequency (LT1372) or,
1MHz Switching frequency (LT1377)
D CASE SIZE
AVX TPS, Sprague 593D
AVX TAJ
C CASE SIZE
AVX TPS
AVX TAJ
B CASE SIZE
AVX TAJ
0.1 to 0.3
0.9 to 2.0
0.2 (Typ)
1.8 to 3.0
2.5 to 10
0.7 to 1.1
0.36 to 0.24
0.5 (Typ)
0.22 to 0.17
0.16 to 0.08
The input capacitor can see a very high surge current when
a battery or high capacitance source is connected “live”
and solid tantalum capacitors can fail under this condition.
Several manufacturers have developed a line of solid
tantalum capacitors specially tested for surge capability
(AVX TPS series, for instance), but even these units may
fail if the input voltage approaches the maximum voltage
Many engineers have heard that solid tantalum capacitors
are prone to failure if they undergo high surge currents.
This is historically true and type TPS capacitors are
specially tested for surge capability, but surge ruggedness
is not a critical issue with the output capacitor. Solid
tantalum capacitors fail during very high turn-on surges,
which do not occur at the output of regulators. High
discharge surges, such as when the regulator output is
dead shorted, do not harm the capacitors.
Single inductor boost regulators have large RMS ripple
current in the output capacitor, which must be rated to
handle the current. The formula to calculate this is:
Output Capacitor Ripple Current (RMS)
DC
I RIPPLE (RMS) = I OUT 1 – DC
rating of the capacitor. AVX recommends derating capaci-
tor voltage by 2:1 for high surge applications. Ceramic and
aluminum electrolytic capacitors may also be used and
have a high tolerance to turn-on surges.
Ceramic Capacitors
Higher value, lower cost ceramic capacitors are now
becoming available in smaller case sizes. These are tempt-
ing for switching regulator use because of their very low
ESR. Unfortunately, the ESR is so low that it can cause
loop stability problems. Solid tantalum capacitor ESR
generates a loop “zero” at 5kHz to 50kHz that is instrumen-
tal in giving acceptable loop phase margin. Ceramic ca-
pacitors remain capacitive to beyond 300kHz and usually
resonate with their ESL before ESR becomes effective.
They are appropriate for input bypassing because of their
high ripple current ratings and tolerance of turn-on surges.
= I OUT
V OUT – V IN
V IN
Linear Technology plans to issue a Design Note on the use
of ceramic capacitors in the near future.
Input Capacitors
The input capacitor of a boost converter is less critical due
to the fact that the input current waveform is triangular and
does not contain large squarewave currents as is found in
the output capacitor. Capacitors in the range of 10 μ F to
100 μ F with an ESR of 0.3 ? or less work well up to full 1.5A
switch current. Higher ESR capacitors may be acceptable
at low switch currents. Input capacitor ripple current for
boost converter is :
Output Diode
The suggested output diode (D1) is a 1N5818 Schottky or
its Motorola equivalent, MBR130. It is rated at 1A average
forward current and 30V reverse voltage. Typical forward
voltage is 0.42V at 1A. The diode conducts current only
during switch off time. Peak reverse voltage for boost
converters is equal to regulator output voltage. Average
forward current in normal operation is equal to output
current.
9
相关PDF资料 |
PDF描述 |
|---|---|
| V300C5T100BL3 | CONVERTER MOD DC/DC 5V 100W |
| V300C5T100BG | CONVERTER MOD DC/DC 5V 100W |
| LT3693IMSE#PBF | IC REG BUCK ADJ 3.5A 10MSOP |
| 1140-392K | CHOKE RF RADIAL 3900UH 10% |
| 1140-332K | CHOKE RF RADIAL 3300UH 10% |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1379HVIR#PBF | 制造商:LINTEC 功能描述: |
| LT137A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Adjustable Regulator |
| LT137A_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Adjustable Regulator |
| LT137AH | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Adjustable Regulator |
| LT137AH/883B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Negative Adjustable Voltage Regulator |
发布紧急采购，3分钟左右您将得到回复。