- 您现在的位置：买卖IC网 > PDF目录1827 > LTC1703IG#TRPBF (Linear Technology)IC REG SW DUAL SYNC VID 28SSOP PDF资料下载
参数资料
| 型号： | LTC1703IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 31/36页 |
| 文件大小： | 0K |
| 描述： | IC REG SW DUAL SYNC VID 28SSOP |
| 标准包装： | 2,000 |
| 应用： | 控制器，移动式 Intel Pentium? III |
| 输入电压： | 3 V ~ 7 V |
| 输出数： | 2 |
| 输出电压： | 0.9 V ~ 2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页当前第31页第32页第33页第34页第35页第36页
LTC1703
APPLICATIO S I FOR ATIO
specified tolerance, the output voltage will ride high when
I LOAD is low and will ride low when I LOAD is high. Compared
to a traditional regulator, a voltage positioning regulator
can theoretically stand as much as twice the ESR drop
across the output capacitor while maintaining output
voltage regulation. This means smaller, cheaper output
capacitors can be used while keeping the output voltage
within acceptable limits.
load which can dissipate 2.5W continuously or 50W if
pulsed with a 5% duty cycle, enough for most LTC1703
circuits. Solder the MOSFET and the resistor(s) as close to
the output of the LTC1703 circuit as possible and set up
the signal generator to pulse at a 100Hz rate with a 5% duty
cycle. This pulses the LTC1703 with 500 μ s transients
10ms apart, adequate for viewing the entire transient
recovery time for both positive and negative transitions
while keeping the load resistor cool.
Measurement Techniques
Measuring transient response presents a challenge in two
respects: obtaining an accurate measurement and gener-
LTC1703
V OUT
ating a suitable transient to use to test the circuit. Output
measurements should be taken with a scope probe
directly across the output capacitor. Proper high fre-
quency probing techniques should be used. In particular,
don’t use the 6" ground lead that comes with the probe!
Use an adapter that fits on the tip of the probe and has a
PULSE
GENERATOR
0V TO 10V
100Hz, 5%
DUTY CYCLE
R LOAD
IRFZ44 OR
EQUIVALENT
50 ?
LOCATE CLOSE
TO THE OUTPUT
1703 F18
short ground clip to ensure that inductance in the ground
path doesn’t cause a bigger spike than the transient signal
being measured. Conveniently, the typical probe tip ground
clip is spaced just right to span the leads of a typical output
capacitor. Make sure the bandwidth limit on the scope is
turned off, since a significant portion of the transient
energy occurs above the 20MHz cutoff.
Now that we know how to measure the signal, we need to
have something to measure. The ideal situation is to use
the actual load for the test, and switch it on and off while
watching the output. If this isn’t convenient, a current step
generator is needed. This generator needs to be able to
turn on and off in nanoseconds to simulate a typical
switching logic load, so stray inductance and long clip
leads between the LTC1703 and the transient generator
must be minimized.
Figure 18 shows an example of a simple transient genera-
tor. Be sure to use a noninductive resistor as the load
element —many power resistors use an inductive spiral
pattern and are not suitable for use here. A simple solution
is to take ten 1/4W film resistors and wire them in parallel
Figure 18. Transient Load Generator
Changing the Output Voltage on the Fly
The voltage at side 1 of the LTC1703 can be changed on the
fly by changing the VID code while the output is enabled,
but care must be taken to avoid tripping the overvoltage
fault circuit. Stepping the voltage upwards abruptly is safe,
but stepping down quickly by more than 15% can leave the
system in a state where the output voltage is still at the old
higher level, but the feedback node is set to expect a new,
substantially lower voltage. If this condition persists for
more than 10 μ s, the overvoltage fault circuitry will fire and
latch off the LTC1703.
The simplest solution is to disable the fault circuit by
grounding the FAULT pin. Systems that must keep the
fault circuit active should ensure that the output voltage is
never programmed to step down by more than 15% in any
single step. The safest strategy is to step the output down
by 10% or less at a time and wait for the output to settle
to the new value before taking subsequent steps.
to get the desired value. This gives a noninductive resistive
1703fa
31
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1707IS8#TRPBF | IC REG BUCK SYNC ADJ 0.6A 8SOIC |
| LTC1708EG-PG#TRPBF | IC REG CTRLR BUCK PWM CM 36-SSOP |
| LTC1709EG-7#TRPBF | IC REG CTRLR BUCK PWM CM 36-SSOP |
| LTC1709EG-8#TRPBF | IC REG CTRLR BUCK PWM CM 36-SSOP |
| LTC1709EG#PBF | IC REG CTRLR BUCK PWM CM 36-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1704BEGN | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC1704BEGN#PBF | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC1704BEGN#TR | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC1704BEGN#TRPBF | 功能描述:IC REG DL BUCK/LINEAR 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LTC1704EGN | 功能描述:IC REG DL BUCK/LINEAR 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
发布紧急采购，3分钟左右您将得到回复。