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参数资料
| 型号： | DC1669A |
| 厂商： | Linear Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM4627 |
| 软件下载： | LTM4627 Spice Model |
| 设计资源： | LTM4627 Gerber Files DC1669A Design Files |
| 标准包装： | 1 |
| 系列： | LTM®, uModule® |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1V，1.2V，1.5V，1.8V，2.5V，3.3V |
| 电流 - 输出： | 15A |
| 输入电压： | 4.5 ~ 20 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM4627 |
| 相关产品： | LTM4627IV#PBF-ND - IC UMODULE DC/DC 15A 133LGA LTM4627EV#PBF-ND - IC UMODULE DC/DC 15A 133LGA |
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LTM4627
APPLICATIONS INFORMATION
SLAVE OUTPUT
TIME
topfeedbackresistoroftheslaveregulatorinequalslew
rate or coincident tracking, then R TA is equal to R FB with
V FB = V TRACK . Therefore R TB = 60.4k, and R TA = 60.4k in
Figure 4.
In ratiometric tracking, a different slew rate maybe desired
for the slave regulator. R TB can be solved for when SR is
slower than MR. Make sure that the slave supply slew
rate is chosen to be fast enough so that the slave output
voltage will reach its final value before the master output.
For example, MR = 1.5V/ms, and SR = 1.2V/ms. Then R TB
= 75k. Solve for R TA to equal 51.1k.
For applications that do not require tracking or sequenc-
ing, simply tie the TRACK/SS pin to INTV CC to let RUN
control the turn on/off. When the RUN pin is below its
threshold or the V IN undervoltage lockout, then TRACK/
SS is pulled low.
MASTER OUTPUT
OUTPUT
VOLTAGE
4627 F05
Figure 5. Output Voltage Coincident Tracking
Overcurrent and Overvoltage Protection
The LTM4627 has overcurrent protection (OCP) in a
short circuit. The internal current comparator threshold
folds back during a short to reduce the output current.
An overvoltage condition (OVP) above 10% of the regu-
lated output voltage will force the top MOSFET off and
the bottom MOSFET on until the condition is cleared.
An input electronic circuit breaker or fuse can be sized to
be tripped or cleared when the bottom MOSFET is turned
on to protect against the overvoltage. Foldback current
limiting is disabled during soft-start or tracking start-up.
Run Enable
The RUN pin is used to enable the power module or
sequence the power module. The threshold is 1.25V, and
the pin has an internal 5.1V Zener to protect the pin. The
RUN pin can be used as an undervoltage lockout (UVLO)
function by connecting a resistor divider from the input
supply to the RUN pin:
V UVLO = ((R1+R2)/R2) ? 1.25V.
See the Block Diagram for the example of use.
INTV CC Regulator
The LTM4627 has an internal low dropout regulator from
V IN called INTV CC . This regulator output has a 4.7μF
ceramic capacitor internal. This regulator powers the
internal controller and MOSFET drivers. The gate driver
current is ~20mA for 750kHz operation. The regulator loss
can be calculated as:
(V IN – 5V) ? 20mA = P LOSS
EXTV CC external voltage source ≥ 4.7V can be applied to
this pin to eliminate the internal INTV CC LDO power loss and
increase regulator efficiency. A 5V supply can be applied
to run the internal circuitry and power MOSFET driver. If
unused, leave pin floating. EXTV CC must be less than V IN
at all times during power-on and power-off sequences.
Stability Compensation
The LTM4627 has already been internally compensated for
all output voltages. Table 4 is provided for most application
requirements. LTpowerCAD is available for other control
loop optimization.
4627fc
16
For more information www.linear.com/LTM4627
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC1669B | 制造商:Linear Technology 功能描述:LTM4627EV Demo Board 20V, 15A DC/DC 制造商:Linear Technology 功能描述:LTM4627EV Demo Board 20V, 15A DC/DC Module Regulator |
| DC16-73 | 制造商:Skyworks Solutions Inc 功能描述:DIRECTIONAL COUPLER 15DB P/N: N011 |
| DC16-73LF | 功能描述:信号调节 .3-2.7GHz Coupling 15.6dB and 14.8dB RoHS:否 制造商:EPCOS 产品:Duplexers 频率:782 MHz, 751 MHz 频率范围: 电压额定值: 带宽: 阻抗:50 Ohms 端接类型:SMD/SMT 封装 / 箱体:2.5 mm x 2 mm 工作温度范围:- 30 C to + 85 C 封装:Reel |
| DC16-73LF-B | 制造商:Skyworks Solutions Inc 功能描述:RF DIRECTIONAL COUPLER |
| DC1676A | 制造商:Linear Technology 功能描述:BOARD DEMO LTC4359 制造商:Linear Technology 功能描述:DEMO BOARD, LTC4359, IDEAL DIODE CONTROLLER; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC4359; Kit Application Type:Power Management; Application Sub Type:Ideal Diode; Kit Contents:Demo Board LTC4359 |
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