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参数资料
| 型号： | LTM4600HVIV#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC UMODULE 10A 104-LGA |
| 产品培训模块： | Power Module vs. Discrete DC to DC |
| 软件下载： | LTM4600HV Spice Model |
| 产品目录绘图： | LTM Series_15x15x2.8 |
| 设计资源： | DC823B-B Design Files LTM4600HVIV#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）： | 10A |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 104-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： | 92% |
| 产品目录页面： | 2711 (CN2011-ZH PDF) |
| 配用： | DC823B-B-ND - BOARD EVAL LTM4600HV |
LTM4600HV
APPLICATIO S I FOR ATIO
(DC) DUTY CYCLE = ON
DC = = OUT
V IN
t
t s
t s V IN
t ON V
C IN
t OFF
t ON
FREQ =
DC
t ON
4602 F25
PERIOD t s
PGND
The LTM4600HV has a minimum (t ON ) on time of 100
nanoseconds and a minimum (t OFF ) off time of 400
nanoseconds. The 2.4V clamp on the ramp threshold as
LOAD
V OUT
TOP LAYER
4600hv F20
a function of V OUT will cause the switching frequency to
increase by the ratio of V OUT /2.4V for 3.3V and 5V outputs.
This is due to the fact the on time will not increase as V OUT
increases past 2.4V. Therefore, if the nominal switch-
Figure 20. Recommended PCB Layout
LTM4600HV Frequency Adjustment
The LTM4600HV is designed to typically operate at 850kHz
across most input and output conditions. The control ar-
chitecture is constant on time valley mode current control.
The f ADJ pin is typically left open or decoupled with an
optional 1000pF capacitor. The switching frequency has
been optimized to maintain constant output ripple over the
operating conditions. The equations for setting the operat-
ing frequency are set around a programmable constant on
time. This on time is developed by a programmable current
into an on board 10pF capacitor that establishes a ramp
that is compared to a voltage threshold equal to the output
voltage up to a 2.4V clamp. This I ON current is equal to:
I ON = (V IN – 0.7V)/110k, with the 110k onboard resistor
from V IN to f ADJ . The on time is equal to t ON = (V OUT /I ON )
? 10pF and t OFF = t s – t ON . The frequency is equal to: Freq.
= DC/t ON . The I ON current is proportional to V IN , and the
regulator duty cycle is inversely proportional to V IN , there-
fore the step-down regulator will remain relatively constant
frequency as the duty cycle adjustment takes place with
lowering V IN . The on time is proportional to V OUT up to a
2.4V clamp. This will hold frequency relatively constant
with different output voltages up to 2.4V. The regulator
switching period is comprised of the on time and off time
as depicted in the following waveform. The on time is
equal to t ON = (V OUT /I ON ) ? 10pF and t OFF = t s – t ON . The
frequency is equal to: Frequency = DC/t ON ).
ing frequency is 850kHz, then the switching frequency
will increase to ~1.2MHz for 3.3V, and ~1.7MHz for 5V
outputs due to Frequency = (DC/t ON ) When the switching
frequency increases to 1.2MHz, then the time period t S is
reduced to ~833 nanoseconds and at 1.7MHz the switching
period reduces to ~588 nanoseconds. When higher duty
cycle conversions like 5V to 3.3V and 12V to 5V need to
be accommodated, then the switching frequency can be
lowered to alleviate the violation of the 400ns minimum
off time. Since the total switching period is t S = t ON + t OFF ,
t OFF will be below the 400ns minimum off time. A resistor
from the f ADJ pin to ground can shunt current away from
the on time generator, thus allowing for a longer on time
and a lower switching frequency. 12V to 5V and 5V to
3.3V derivations are explained in the data sheet to lower
switching frequency and accommodate these step-down
conversions.
Equations for setting frequency for 12V to 5V:
I ON = (V IN – 0.7V)/110k; I ON = 103μA
frequency = (I ON /[2.4V ? 10pF]) ? DC = 1.79MHz;
DC = duty cycle, duty cycle is (V OUT /V IN )
t S = t ON + t OFF , t ON = on-time, t OFF = off-time of the
switching period; t S = 1/frequency
t OFF must be greater than 400ns, or t S – t ON > 400ns.
t ON = DC ? t S
1MHz frequency or 1μs period is chosen for 12V to 5V.
4600hvfc
17
相关PDF资料 |
PDF描述 |
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| LTM4600IV#PBF | IC DC/DC UMODULE 10A 104-LGA |
| LTM4601AHVEV#PBF | IC DC/DC UMODULE 12A 133-LGA |
| LTM4601AIY#PBF | IC DC/DC UMODULE 12A 133-BGA |
| LTM4602IV#PBF | IC DC/DC UMODULE 6A 104-LGA |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTM4600HVIV-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:10A, 28VIN High Effi ciency DC/DC μModule |
| LTM4600HVMP | 制造商:LINER 制造商全称:Linear Technology 功能描述:Low VIN, 8A DC/DC Module Regulator with Tracking, Margining, and Frequency Synchronization |
| LTM4600HVMPV | 制造商:LINER 制造商全称:Linear Technology 功能描述:10A, 28VIN High Effi ciency DC/DC μModule |
| LTM4600HVMPV#PBF | 功能描述:IC DC/DC UMODULE 10A 104-LGA RoHS:是 类别:电源 - 板载 >> DC DC Converters 系列:µModule® 设计资源:Maxi/Mini/Micro Design Guide, Appl Manual 标准包装:1 系列:微型 类型:隔离 输出数:1 电压 - 输入（最小）:18V 电压 - 输入（最大）:36V Voltage - Output 1:48V 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:模块 尺寸/尺寸:2.28" L x 1.45" W x 0.62" H（57.9mm x 36.8mm x 15.7mm） 包装:散装 工作温度:-20°C ~ 100°C 效率:* 电源（瓦特）- 最大:* 其它名称:1102-1290V24C48C100BL-ND |
| LTM4600HVMPV#PBF | 制造商:Linear Technology 功能描述:IC, STEP-DOWN DC/DC MODULE, LGA-104 |
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