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参数资料
| 型号： | LT3724IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 16TSSOP |
| 标准包装： | 95 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 225kHz |
| 占空比： | 100% |
| 电源电压： | 4 V ~ 60 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
LT3724
APPLICATIONS INFORMATION
The desired soft-start rise time (t SS ) is programmed via
a programming capacitor C SS1 , using a value that cor-
responds to 2μA average current during the soft-start
interval. This capacitor value follows the relation:
V OUT
C SS1 =
2 ? 10 –6 ? t SS
V OUT
V OUT(SS)
V(V C )
R SS is typically set to 200k for most applications.
TIME, 250μs/DIV
3724 F05
R SS =
? L ?
? C OUT ? ?
ConsiderationsforLow-VoltageOutputApplications
The LT3724 C SS pin biases to 220mV during the soft-start
cycle, and this voltage is increased at Figure 4 node “A” by
the 2μA signal current through R SS , so the output has to
reach this value before the soft-start function is engaged.
The value of this output soft-start startup voltage offset
(V OUT(SS) ) follows the relation:
V OUT(SS) = 220mV + R SS ? 2 ? 10 – 6
Which is typically 0.64V for R SS = 200k.
In some low voltage output applications, it may be desir-
able to reduce the value of this soft-start startup voltage
offset. This is possible by reducing the value of R SS . With
reduced values of R SS , the signal component caused by
voltage ripple on the output must be minimized for proper
soft-start operation.
Peak-to-peak output voltage ripple (?V OUT ) will be imposed
on node “A” through the capacitor C SS1 . The value of R SS
can be set using the following equation:
? V OUT
1.3 ? 10 – 6
It is important to use low ESR output capacitors for LT3724
voltage converter designs to minimize this ripple voltage
component. A design with an excessive ripple component
can be evidenced by observing the V C pin during the start
cycle.
The soft-start cycle should be evaluated to verify that the
reduced R SS value allows operation without excessive
modulation of the V C pin before finalizing the design.
If V C pin has an excessive ripple component during the
soft-start cycle, converter output ripple should be reduced.
Figure 5. Soft-Start Characteristic
Showing Excessive Ripple Component
V OUT
V OUT(SS)
V(V C )
TIME, 250μs/DIV
3724F06
Figure 6. Desirable Soft-Start Characteristic
This is typically accomplished by increasing output capaci-
tance and/or reducing output capacitor ESR.
External Current Limit Foldback Circuit
An additional startup voltage offset can occur during the
period before the LT3724 soft-start circuit becomes ac-
tive. Before the soft-start circuit throttles back the V C pin
in response to the rising output voltage, current as high
as the peak programmed current limit (I MAX ) can flow in
the switched inductor. Switching will stop once the soft-
start circuit takes hold and reduces the voltage on the
V C pin, but the output voltage will continue to increase
as the stored energy in the inductor is transferred to the
output capacitor. With I MAX in the inductor, the resulting
leading-edge rise on V OUT due to energy stored in the
inductor follows the relation:
1/2
? V OUT = I MAX ? ?
3724fd
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3724IFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Current Mode Switching Regulator Controller |
| LT3724MPFE | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Up/Step Down 4V to 60V Input 16-Pin TSSOP EP |
| LT3724MPFE#PBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3724MPFE#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Step Up/Step Down 4V to 60V Input 16-Pin TSSOP EP T/R |
| LT3724MPFE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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