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参数资料
| 型号： | LT1680C |
| 厂商： | Linear Technology Corporation |
| 英文描述： | High Power DC/DC Step-Up Controller |
| 中文描述： | 高功率DC / DC升压控制器 |
| 文件页数： | 15/16页 |
| 文件大小： | 322K |
| 代理商： | LT1680C |
15
LT1680
APPLICATIO
S I
N
FOR
ATIO
U
The input bypass capacitors generally have less ripple
current than the output bypass capacitors as the input
current in a boost converter is continuous. Input bypass
capacitor selection can be made using ripple current
ratings. Peak-to-peak ripple current is equal to the induc-
tor ripple current (
I
L
).
W
U
Efficiency Considerations and Heat Dissipation
High output power applications create an inherent con-
cern regarding power dissipation in regulator compo-
nents. Although high efficiencies are achieved using the
LT1680, the power dissipated in the regulator climbs to
relatively high values when the load draws large amounts
of power. Even at 90% efficiency, a 500W application has
conversion loss of 55W.
I
2
R dissipation in the MOSFET switch, sense resistor and
inductor series resistance can generate substantial con-
version loss under high current conditions. Generally, the
dominant I
2
R loss is evidenced in the FET switch, which is
proportional to the steady-state duty cycle, or conduction
time of the switch. For example, in a 5V to 48V boost
converter, the duty cycle is:
DC = 1 – (V
IN
/V
OUT
)
DC = 1 – 5/48
≈
90%
The FET switch conducts inductor current for almost 90%
of the cycle time, and thus may require increased consid-
eration for dissipating I
2
R power.
Gate Drive Buffer
The LT1680 is designed to drive relatively large capacitive
loads. However, in certain applications, efficiency im-
provements can be realized by adding an external buffer
stage to drive the gate of the FET switch. When the switch
gate loads the driver output such that rise/fall times
exceed 100ns, buffers can sometimes result in efficiency
gains. Buffers can also reduce effects of back injection into
the gate driver output due to coupling of switch node
transitions through the switch FET C
MILLER
.
Optimizing Transient Response–
Compensation Component Values
The dominant compensation point for an LT1680 con-
verter is the V
C
pin (Pin 5), or error amplifier output. This
pin connects to an external series RC network, R
VC
and
C
VC
. The infinite permutations of input/output filtering,
capacitor ESR, input voltage, load current, etc. make for an
empirical method of optimizing loop response for a spe-
cific set of conditions.
Loop response can be observed by injecting a step change
in load current. This can be achieved by using a switchable
load. With the load switching, the transient response of the
output voltage can be observed with an oscilloscope.
Iterating through RC combinations will yield optimized
response. Refer to Application Note 19 in the 1990 Linear
Applications Handbook, Volume 1for more information.
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
N
U
N Package
16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
N16 1197
0.009 – 0.015
(0.229 – 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.325–0.015
+0.889
–0.381
8.255
(
)
0.255
±
0.015*
(6.477
±
0.381)
0.770*
(19.558)
MAX
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0.020
(0.508)
MIN
0.125
(3.175)
MIN
0.130
±
0.005
(3.302
±
0.127)
0.065
(1.651)
TYP
0.045 – 0.065
(1.143 – 1.651)
0.018
±
0.003
(0.457
±
0.076)
0.100
±
0.010
(2.540
±
0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
相关PDF资料 |
PDF描述 |
|---|---|
| LT1680CN | High Power DC/DC Step-Up Controller |
| LT1680CSW | High Power DC/DC Step-Up Controller |
| LT1680I | High Power DC/DC Step-Up Controller |
| LT1680IN | High Power DC/DC Step-Up Controller |
| LT1680ISW | High Power DC/DC Step-Up Controller |
相关代理商/技术参数 |
参数描述 |
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| LT1680CN | 功能描述:IC REG CTRLR BST PWM CM 16-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1680CN#PBF | 功能描述:IC REG CTRLR BST PWM CM 16-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT1680CSW | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1680CSW#PBF | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT1680CSW#TR | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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