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| 型号： | LTC3828EG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 2,000 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 590kHz |
| 占空比： | 99.4% |
| 电源电压： | 4.5 V ~ 28 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： | -40°C ~ 85°C |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
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LTC3828
APPLICATIONS INFORMATION
By selecting different resistors, the LTC3828 can achieve
different modes of tracking including the two in Figure 4.
Figure 6 helps to explaining the tracking function. At the
input stage of an error ampli?er, two diodes are used to
clamp the equivalent reference voltage and an additional
diode is used to match the shifted common mode voltage.
The top two current sources are of the same value. When
the TRCKSS voltage is low, switch S1 is on and V OSENSE
follows the TRCKSS voltage. When the TRCKSS voltage
is close to 0.8V, the reference voltage, switch S1, is off
and V OSENSE follows the reference voltage. The regulation
for both channels’ outputs are not affected by the tracking
mode. In the ratiometric tracking mode, the two channels
do not exhibit cross talk.
The number of resistors in Figure 5a can be further reduced
with the scheme in Figure 7.
In a system that requires more than two tracked supplies,
multiple LTC3828s can be daisy-chained through the
TRCKSS1 pin. TRCKSS1 clamps channel 1’s reference in
the same manner TRCKSS2 clamps channel 2. To eliminate
the possibility of multiple LTC3828s coming on at different
times, only the master LTC3828’s TRCKSS1 pin should
be connected to a soft-start capacitor. Figure 8 shows the
circuit with four outputs. Three of them are programmed
in the coincident mode while the fourth one tracks ratio-
metrically. If output tracking is not needed, the TRCKSS pins
are used as soft start-up pins. The capacitors connected
to those pins set the soft-start ramping up speed.
Figure 15 is a basic LTC3828 application circuit. External
component selection is driven by the load requirement,
and begins with the selection of R SENSE and the inductor
value. Next, the power MOSFETs and D1 are selected.
Finally, C IN and C OUT are selected. The circuit shown in
Figure 15 is con?gured for operation up to an input voltage
of 28V (limited by the external MOSFETs).
R SENSE Selection For Output Current
R SENSE is chosen based on the required output current.
The current comparator has a maximum threshold of
75mV/R SENSE and an input common mode range of SGND
V OUT1
V OUT2
V OUT1
V OUT2
R3
R1
R3
R1
R3
TO
TO
TO
TO
TO
TO
TRCKSS2
PIN
R4
R2
V OSENSE1 V OSENSE2
PIN PIN
R4
TRCKSS2
PIN
R2
V OSENSE1
PIN
V OSENSE2
PIN
R4
3828 F05
(5a) Coincident Tracking Setup
(5b) Ratiometric Tracking Setup
? R 1 V OUT 1 R 3 V ?
? ? R 2 0 . 8 – 1 , R 4 0 . 8 – 1 ? ? T
Figure 5. Setup for Coincident and Ratiometric Tracking
= = OUT 2
V OUT1
V OUT2
I
I
R1
R4
S1
+
TO TRCKSS2 PIN
R2
R5
TO V OSENSE2 PIN
TRCKSS
0.8V
D1
D2
D3
–
EA
TO V OSENSE1 PIN
R3
V OSENSE
Figure 6. Equivalent Input Circuit of
3828 F06
3828 F07
Figure 7. Alternative Setup for Coincident Tracking
= OUT 1 – 1 ,
= = OUT 2 – 1 ?
Error Ampli?er of Channel 2
? R1 + R2 V
?
? R 3 0 . 8
R 1 R 4 V ?
R 2 + R 3 R 5 0 . 8 ?
3828fc
14
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相关代理商/技术参数 |
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| LTC3828EUH | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 4.5V to 28V Input 32-Pin QFN EP |
| LTC3828EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3828EUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3829EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
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