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| 型号： | LTM4601AHVEV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/30页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC UMODULE 12A 133-LGA |
| 产品培训模块： | Power Module vs. Discrete DC to DC |
| 软件下载： | LTM4601AHV Spice Model |
| 产品目录绘图： | LTM Series_15x15x2.8 |
| 设计资源： | DC1414B Design Files LTM4601AHVEV#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）： | 28V |
| Voltage - Output 1： | 0.6 ~ 5 V |
| 电流 - 输出（最大）： | 12A |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 133-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： | 95% |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
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LTM4601AHV
APPLICATIONS INFORMATION
Example for 5V Output
LTM4601AHV minimum on-time = 100ns
t ON = [(V OUT ? 10pF)/I fSET ], for V OUT > 4.8V use 4.8V
LTM4601AHV minimum off-time = 400ns
t OFF = t – t ON , where t = 1/Frequency
Duty Cycle = t ON /t or V OUT /V IN
Equations for setting frequency:
I fSET = [V IN /(3 ? R fSET )], for 28V operation, I fSET = 238μA,
t ON = [(4.8 ? 10pF)/I fSET ], t ON = 202ns, where the internal
R fSET is 39.2k. Frequency = [V OUT /(V IN ? t ON )] = [5V/(28 ?
202ns)] ~ 884kHz. The inductor ripple current begins to
get high at the higher input voltages due to a larger voltage
across the inductor. This is noted in the Inductor Ripple
Current vs Duty Cycle graph (Figure 3) where I L ≈ 10A at
20% duty cycle. The inductor ripple current can be lowered
at the higher input voltages by adding an external resistor
from f SET to ground to increase the switching frequency.
A 7A ripple current is chosen, and the total peak current
is equal to 1/2 of the 7A ripple current plus the output
current. The 5V output current is limited to 8A, so the
total peak current is less than 11.5A. This is below the
14A peak specified value. A 100k resistor is placed from
f SET to ground, and the parallel combination of 100k and
39.2k equates to 28k. The I fSET calculation with 28k and
28V input voltage equals 333μA. This equates to a t ON of
144ns. This will increase the switching frequency from
~884kHz to ~1.24MHz for the 28V to 5V conversion. The
minimum on time is above 100ns at 28V input. Since the
switching frequency is approximately constant over input
and output conditions, then the lower input voltage range
is limited to 10V for the 1.24MHz operation due to the
400ns minimum off time. Equation: t ON = (V OUT /V IN ) ? (1/
Frequency) equates to a 400ns on time, and a 400ns off
time. The V IN to V OUT Step-Down Ratio curves reflect an
operating range of 10V to 28V for 1.24MHz operation with
a 100k resistor to ground as shown in Figure 18, and an
8V to 16V operation for f SET floating. These modifications
are made to provide wider input voltage ranges for the 5V
output designs while limiting the inductor ripple current,
and maintaining the 400ns minimum off-time.
Example for 3.3V Output
LTM4601AHV minimum on-time = 100ns
t ON = [(V OUT ? 10pF)/I fSET ]
LTM4601AHV minimum off-time = 400ns
t OFF = t – t ON , where t = 1/Frequency
Duty Cycle (DC) = t ON /t or V OUT /V IN
Equations for setting frequency:
I fSET = [V IN /(3 ? R fSET )], for 28V operation, I fSET = 238μA,
t ON = [(3.3 ? 10pF)/I fSET ], t ON = 138.7ns, where the internal
R fSET is 39.2k. Frequency = [V OUT /(V IN ? t ON )] = [3.3V/(28 ?
138.7ns)] ~ 850kHz. The minimum on-time and minimum
off-time are within specification at 139ns and 1037ns. The
4.5V minimum input for converting 3.3V output will not
meet the minimum off-time specification of 400ns. t ON =
868ns, Frequency = 850kHz, t OFF = 315ns.
Solution
Lower the switching frequency at lower input voltages to
allow for higher duty cycles, and meet the 400ns minimum
off-time at 4.5V input voltage. The off-time should be about
500ns, which includes a 100ns guard band. The duty cycle
for (3.3V/4.5V) = ~73%. Frequency = (1 – DC)/t OFF or
(1 – 0.73)/500ns = 540kHz. The switching frequency
needs to be lowered to 540kHz at 4.5V input. t ON = DC/
frequency, or 1.35μs. The f SET pin voltage is 1/3 of V IN , and
the I fSET current equates to 38μA with the internal 39.2k.
The I fSET current needs to be 24μA for 540kHz operation.
As shown in Figure 19, a resistor can be placed from V OUT
to f SET to lower the effective I fSET current out of the f SET
pin to 24μA. The f SET pin is 4.5V/3 =1.5V and V OUT = 3.3V,
therefore 130k will source 14μA into the f SET node and
lower the I fSET current to 24μA. This enables the 540kHz
operation and the 4.5V to 28V input operation for down
converting to 3.3V output. The frequency will scale from
540kHz to 1.1 MHz over this input range. This provides
for an effective output current of 8A over the input range.
20
For more information www.linear.com/LTM4601AHV
4601ahvfc
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相关代理商/技术参数 |
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| LTM4601AHVEY#PBF | 功能描述:IC DC/DC UMODULE 12A 133-BGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:66V 电压 - 输入（最大）:160V Voltage - Output 1:12V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:50W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-FinMod 尺寸/尺寸:4.60" L x 1.86" W x 0.79" H（116.8mm x 47.2mm x 20.1mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:* |
| LTM4601AHVEY#PBF | 制造商:Linear Technology 功能描述:BUCK REGULATOR DC/DC UMODULE 12A BGA- |
| LTM4601AHVIV#PBF | 功能描述:IC DC/DC UMODULE 12A 133-LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:VI-200, VI-J00 Design Guide, Appl Manual 标准包装:1 系列:* 类型:隔离 输出数:1 电压 - 输入（最小）:21V 电压 - 输入（最大）:32V Voltage - Output 1:5V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:100W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:9-SlimMod 尺寸/尺寸:4.60" L x 1.80" W x 0.52" H（116.8mm x 45.7mm x 13.2mm） 包装:散装 工作温度:-25°C ~ 85°C 效率:* 电源（瓦特）- 最大:* |
| LTM4601AHVIV#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LTM4601AHVIV-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:12A, 28VIN DC/DC μModule with PLL, Output Tracking and Margining |
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