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| 型号： | LTM4603IV-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/26页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC UMODULE 6A 118-LGA |
| 产品培训模块： | Power Module vs. Discrete DC to DC |
| 软件下载： | LTM4603-1 Spice Model |
| 产品目录绘图： | LTM Series_15x15x2.8 |
| 设计资源： | LTM4603IV-1#PBF Footprint.bxl |
| 特色产品： | μModule Products |
| 标准包装： | 119 |
| 系列： | µModule® |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 4.5V |
| 电压 - 输入（最大）： | 20V |
| Voltage - Output 1： | 0.6 ~ 5 V |
| 电流 - 输出（最大）： | 6A |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 118-LGA |
| 尺寸/尺寸： | 0.59" L x 0.59" W x 0.11" H（15.0mm x 15.0mm x 2.8mm） |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 93% |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
LTM4603/LTM4603-1
APPLICATIONS INFORMATION
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
1-PHASE
2-PHASE
3-PHASE
4-PHASE
6-PHASE
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9
DUTY CYCLE (V O /V IN )
4603 F04
Figure 4. Normalized Output Ripple Current vs Duty Cycle, Dlr = V O T/L I
Figure 4 provides a ratio of peak-to-peak output ripple cur-
rent to the inductor current as a function of duty cycle and
the number of paralleled phases. Pick the corresponding
duty cycle and the number of phases to arrive at the correct
output ripple current ratio value. If a 2-phase operation
is chosen at a duty cycle of 21%, then 0.6 is the ratio.
This 0.6 ratio of output ripple current to inductor ripple
of 3A equals 8A of effective output ripple current. Refer
to Application Note 77 for a detailed explanation of output
ripple current reduction as a function of paralleled phases.
The output ripple voltage has two components that are
related to the amount of bulk capacitance and effective
series resistance (ESR) of the output bulk capacitance.
Therefore, the output ripple voltage can be calculated with
the known effective output ripple current. The equation:
Δ V OUT(P-P) ≈ ( Δ I L /(8 ? f ? m ? C OUT ) + ESR ? Δ I L ), where
f is frequency and m is the number of parallel phases.
This calculation process can be easily accomplished by
LTpowerCAD?.
Fault Conditions: Current Limit and Overcurrent
Foldback
The LTM4603 has a current mode controller which inher-
ently limits the cycle-by-cycle inductor current, not only in
steady-state operation but also in response to transients.
To further limit current in the event of an overload condi-
tion, the LTM4603 provides foldback current limiting. If the
output voltage falls by more than 50%, then the maximum
output current is progressively lowered to about one sixth
of its full current limit value.
Soft-Start and Tracking
The TRACK/SS pin provides a means to either soft-start
the regulator or track it to a different power supply. A
capacitor on this pin will program the ramp rate of the
output voltage. A 1.5μA current source will charge up the
external soft-start capacitor to 80% of the 0.6V internal
voltage reference plus or minus any margin delta. This will
4603fb
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM4603IV-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A DC/DC μModule with PLL, Output Tracking and Margining |
| LTM4603V | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A DC/DC μModule with PLL, Output Tracking and Margining |
| LTM4603V-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A DC/DC μModule with PLL, Output Tracking and Margining |
| LTM4604 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Voltage, 4A DC/DC μModuleTM with Tracking |
| LTM4604A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low Voltage, 4A DC/DC μModule with Tracking |
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