参数资料
| 型号： | LTC3813EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-SSOP |
| 标准包装： | 47 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 7 V ~ 75 V |
| 降压： | 无 |
| 升压： | 是 |
| 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： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
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LTC3813
APPLICATIONS INFORMATION
The basic LTC3813 application circuit is shown on the ?rst
page of this data sheet. External component selection is
primarily determined by the maximum input voltage and
load current and begins with the selection of the sense
resistance and power MOSFET switches. The LTC3813
uses either a sense resistor or the on-resistance of the
The current mode control loop will not allow the induc-
tor peak to exceed V SENSE(MAX) /R SENSE . In practice, one
should allow some margin for variations in the LTC3813
and external component values, and a good guide for
selecting the maximum sense voltage when V DS sensing
is used is:
synchronous power MOSFET for determining the induc-
tor current. The desired amount of ripple current and
operating frequency largely determines the inductor
V SENSE(MAX) =
1.7 ? R DS(ON) ?I O(MAX)
1 D MAX
value. Next, C OUT is selected for its ability to handle the
large RMS current and with low enough ESR to meet the
output voltage ripple and transient speci?cation. Finally,
loop compensation components are selected to meet the
required transient/phase margin speci?cations.
Duty Cycle Considerations
For a boost converter, the duty cycle of the main switch is:
V SENSE is set by the voltage applied to the V RNG pin. Once
V SENSE is chosen, the required V RNG voltage is calculated
to be:
V RNG = 5.78 ? (V SENSE(MAX) + 0.026)
An external resistive divider from INTV CC can be used
to set the voltage of the V RNG pin between 0.5V and 2V
resulting in nominal sense voltages of 60mV to 320mV.
D = 1
V IN
V OUT
; D MAX = 1
V IN(MIN)
V OUT
Additionally, the V RNG pin can be tied to SGND or INTV CC
in which case the nominal sense voltage defaults to 95mV
or 215mV, respectively.
The maximum V OUT capability of the LTC3813 is inversely
proportional to the minimum desired operating frequency
and minimum off-time:
Connecting the SENSE + and SENSE – Pins
The LTC3813 can be used with or without a sense resis-
V OUT(MAX) =
V IN(MIN)
f MIN ? t OFF(MIN)
100V
tor. When using a sense resistor, place it between the
source of the bottom MOSFET, M2, and PGND. Connect
the SENSE + and SENSE – pins to the top and bottom of
the sense resistor. Using a sense resistor provides a well
Maximum Sense Voltage and the V RNG Pin
The control circuit in the LTC3813 measures the input
current by using the R DS(ON) of the bottom MOSFET or
by using a sense resistor in the bottom MOSFET source,
so the output current needs to be re?ected back to the
input in order to dimension the power MOSFET properly
and to choose the maximum sense voltage. Based on the
fact that, ideally, the output power is equal to the input
power, the maximum average input current and average
inductor current is:
de?ned current limit, but adds cost and reduces ef?ciency.
Alternatively, one can eliminate the sense resistor and use
the bottom MOSFET as the current sense element by simply
connecting the SENSE + pin to the lower MOSFET drain
and SENSE – pin to the MOSFET source. This improves
ef?ciency, but one must carefully choose the MOSFET
on-resistance, as discussed in the following section.
I IN(MAX) = I L,AVG(MAX) =
I O(MAX)
1 D MAX
3813fb
13
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| LTC3813IG#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP 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 |
| LTC3813IG#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP 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 |
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