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参数资料
| 型号： | DC823B-A |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LTM4600 |
| 设计资源： | DC823B-A Design Files DC823B-A Schematic |
| 标准包装： | 1 |
| 系列： | µModule® |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 0.6V，1.2V，1.5V，1.8V，2.5V，3.3V，和 5V |
| 电流 - 输出： | 10A |
| 输入电压： | 4.5 ~ 20V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.35MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTM4600 |
| 相关产品： | LTM4600IV#PBF-ND - IC DC/DC UMODULE 10A 104-LGA LTM4600EV#PBF-ND - IC DC/DC UMODULE 10A 104-LGA |
LTM4600
APPLICATIONS INFORMATION
Output Voltage Tracking
For the applications that require output voltage tracking,
several LTM4600 modules can be programmed by the
power supply tracking controller such as the LTC2923.
Figure 6 shows a typical schematic with LTC2923. Coin-
cident, ratiometric and offset tracking for V O rising and
falling can be implemented with different sets of resistor
values. See the LTC2923 data sheet for more details.
1. EXTV CC grounded. Internal 5V LDO is always powered
from the internal 5V regulator.
2. EXTV CC connected to an external supply. Internal LDO
is shut off. A high ef?ciency supply compatible with the
MOSFET gate drive requirements (typically 5V) can im-
prove overall ef?ciency. With this connection, it is always
required that the EXTV CC voltage can not be higher than
V IN pin voltage.
V IN
5V
DC/DC
Q1
3.3V
Discontinuous Operation and FCB Pin
The FCB pin determines whether the internal bottom
V IN
V IN
MOSFET remains on when the inductor current reverses.
There is an internal 4.75k pull-down resistor connecting
R ONB
R ONA
V CC
ON
GATE
LTC2923
RAMP
FB1
LTM4600
V OSET V OUT
49.9k
1.8V
this pin to ground. The default light load operation mode
is forced continuous (PWM) current mode. This mode
provides minimum output voltage ripple.
R TB1
RAMPBUF
TRACK1
STATUS
SDO
V IN
V IN
In the application where the light load ef?ciency is im-
portant, tying the FCB pin above 0.6V threshold enables
R TA1
R TB2
R TA2
TRACK2
GND
FB2
LTM4600
V OSET V OUT
66.5k
1.5V
discontinuous operation where the bottom MOSFET turns
off when inductor current reverses. Therefore, the conduc-
tion loss is minimized and light load ef?ciency is improved.
4600 F06
Figure 6. Output Voltage Tracking with the LTC2923 Controller
EXTV CC Connection
An internal low dropout regulator produces an internal 5V
supply that powers the control circuitry and FET drivers.
Therefore, if the system does not have a 5V power rail,
the LTM4600 can be directly powered by V IN . The gate
driver current through LDO is about 18mA. The internal
LDO power dissipation can be calculated as:
P LDO_LOSS = 18mA ? (V IN – 5V)
The penalty is that the controller may skip cycle and the
output voltage ripple increases at light load.
Paralleling Operation with Load Sharing
Two or more LTM4600 modules can be paralleled to provide
higher than 10A output current. Figure 7 shows the neces-
sary interconnection between two paralleled modules. The
OPTI-LOOP ? current mode control ensures good current
sharing among modules to balance the thermal stress.
The new feedback equation for two or more LTM4600s
in parallel is:
+ R SET
The LTM4600 also provides an external gate driver volt-
age pin EXTV CC . If there is a 5V rail in the system, it is
recommended to connect EXTV CC pin to the external 5V
V OUT = 0.6V ?
100k
N
R SET
rail. Whenever the EXTV CC pin is above 4.7V, the internal
5V LDO is shut off and an internal 50mA P-channel switch
connects the EXTV CC to internal 5V. Internal 5V is supplied
from EXTV CC until this pin drops below 4.5V. Do not apply
where N is the number of LTM4600s in parallel.
OPTI-LOOP is a registered trademark of Linear Technology Corporation.
more than 6V to the EXTV CC pin and ensure that EXTV CC
< V IN . The following list summaries the possible connec-
tions for EXTV CC :
4600fc
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DC823B-B | 功能描述:BOARD EVAL LTM4600HV RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:µModule® 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| DC826A-B | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC2951-2 PUSH BUTTON ON/OFF CTRL, Silicon Manufacturer:Linear Techn |
| DC826B-A | 功能描述:BOARD EVAL LTC2950 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| DC826B-A | 制造商:Linear Technology 功能描述:EVAL BOARD, LTC2950-2 PUSH BUTTON ON/OFF |
| DC826B-B | 功能描述:BOARD EVAL LTC2950 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
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