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参数资料
| 型号： | LT3430EFE-1#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 6.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, PLASTIC, TSSOP-16 |
| 文件页数： | 6/28页 |
| 文件大小： | 321K |
| 代理商： | LT3430EFE-1#TR |
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LT3430/LT3430-1
14
34301fa
frequency gain of the error amplier, including the gain at
the switching frequency. If the gain of the error amplier
is high enough at the switching frequency, output ripple
voltage (although smaller for a ceramic output capacitor)
may still affect the proper operation of the regulator. A
lter capacitor CF in parallel with the RC/CC network is
suggested to control possible ripple at the VC pin. An “All
Ceramic” solution is possible for the LT3430/LT3430-1
by choosing the correct compensation components for
the given application.
Example: For VIN = 8V to 40V, VOUT = 5V at 2A, the LT3430
can be stabilized, provide good transient response and
maintain very low output ripple voltage using the follow-
ing component values: (refer to the rst page of this data
sheet for component references) CIN = 4.7F, RC = 3.3k,
CC = 22nF, CF = 220pF and COUT = 100F. See Application
Note 19 for further detail on techniques for proper loop
compensation.
INPUT CAPACITOR
Step-down regulators draw current from the input supply
in pulses. The rise and fall times of these pulses are very
fast. The input capacitor is required to reduce the volt-
age ripple this causes at the input of LT3430/LT3430-1
and force the switching current into a tight local loop,
thereby minimizing EMI. The RMS ripple current can be
calculated from:
II
V
RIPPLE RMS
OUT
IN
OUT
IN
() =
()
–/
2
Ceramic capacitors are ideal for input bypassing. At
200kHz (100kHz) switching frequency, the energy storage
requirement of the input capacitor suggests that values
in the range of 4.7F to 20F (10F to 47F) are suitable
for most applications. If operation is required close to the
minimum input required by the output of the LT3430, a
larger value may be required. This is to prevent excessive
ripple causing dips below the minimum operating voltage
resulting in erratic operation.
Depending on how the LT3430/LT3430-1 circuit is powered
up you may need to check for input voltage transients.
The input voltage transients may be caused by input voltage
steps or by connecting the LT3430/LT3430-1 converter to
an already powered up source such as a wall adapter. The
sudden application of input voltage will cause a large surge
of current in the input leads that will store energy in the
parasitic inductance of the leads. This energy will cause the
input voltage to swing above the DC level of input power
source and it may exceed the maximum voltage rating of
input capacitor and LT3430/LT3430-1.
The easiest way to suppress input voltage transients is
to add a small aluminum electrolytic capacitor in parallel
with the low ESR input capacitor. The selected capacitor
needs to have the right amount of ESR in order to criti-
cally dampen the resonant circuit formed by the input lead
inductance and the input capacitor. The typical values of
ESR will fall in the range of 0.5Ω to 2Ω and capacitance
will fall in the range of 5F to 50F.
If tantalum capacitors are used, values in the 22F to
470F range are generally needed to minimize ESR and
meet ripple current and surge ratings. Care should be taken
to ensure the ripple and surge ratings are not exceeded.
The AVX TPS and Kemet T495 series are surge rated. AVX
recommends derating capacitor operating voltage by 2:1
for high surge applications.
CATCH DIODE
Highest efciency operation requires the use of a Schottky
type diode. DC switching losses are minimized due to its
low forward voltage drop, and AC behavior is benign due
to its lack of a signicant reverse recovery time.
The use of so-called “ultrafast” recovery diodes is generally
not recommended. When operating in continuous mode,
the reverse recovery time exhibited by “ultrafast” diodes
will result in a slingshot type effect. The power internal
switch will ramp up VIN current into the diode in an at-
tempt to get it to recover. Then, when the diode has nally
turned off, some tens of nanoseconds later, the VSW node
voltage ramps up at an extremely high dV/dt, perhaps 5 to
even 10V/ns ! With real world lead inductances, the VSW
node can easily overshoot the VIN rail. This can result in
APPLICATIONS INFORMATION
相关PDF资料 |
PDF描述 |
|---|---|
| LT3430IFE-1 | 6.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3430EFE-1 | 6.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT3467AIDDB#PBF | 2.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3467AIDDB | 2.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3467IS6#TRM | 2.5 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3430EFEPBF | 制造商:Linear Technology 功能描述:LT3430 adj 3A Buck SD dc-dc converter |
| LT3430IFE | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3430IFE#PBF | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3430IFE#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LT3430IFE#TR | 功能描述:IC REG BUCK ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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