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參數資料
| 型號： | LTC3773EUHF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封裝： | 5 X 7 MM, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數： | 14/32頁 |
| 文件大?。?/td> | 461K |
| 代理商： | LTC3773EUHF |
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LTC3773
21
3773fa
VFB1
TRACK2
TRACK3
TRACK1
VFB2
VFB3
LTC3773
VOUT1
VOUT2
VOUT3
R12
R11
R22
R21
R32
R31
R22
R21
R32
R31
3773 F05b
1M
CSS
MASTER
VOUT
R12
R11
10k
CSLEW
RAMP
SOURCE
TRACK
DOWN
0V TO 2V
2.5V VOUT1 1V/DIV
1.8V VOUT2 1V/DIV
1.2V VOUT3 1V/DIV
TRACK 1
1V/DIV
0.1s/DIV
3773 F05b
Figure 5a. Ratiometric Tracking. TRACK1 Functions
as a Soft-Start Pin; VOUT2 and VOUT3 Track VOUT1
with Ratiometric Start-Up Slew Rate
Figure 5b. Coincident Tracking. TRACK1 Functions
as a Soft-Start Pin; VOUT2 and VOUT3 Track VOUT1
with the Same Start-Up Slew Rate
VFB1
TRACK2
TRACK3
TRACK1
VFB2
VFB3
LTC3773
VOUT1
1M
CSS
VOUT2
VOUT3
R12
R11
MASTER
VOUT
RM2
RM1
R22
R21
R32
R31
10k
3773 F04a
CSLEW
RAMP
SOURCE
TRACK
DOWN
0V TO 2V
2.5V VOUT1 1V/DIV
1.8V VOUT2 1V/DIV
1.2V VOUT3 1V/DIV
TRACK 1
0.5V/DIV
0.1s/DIV
3773 F05a
and the TRACK DOWN switch as shown in Figure 5a
and 5b.
With a simple conguration, TRACK allows VOUT start-
up to track the master channel as shown qualitatively
in Figures 5a and 5b. The LTC3773 can be congured
for two different up/down tracking modes:coincident or
ratiometric.
To implement the ratiometric tracking shown in Figure 5a,
no extra divider is needed; simply connect the TRACK2 and
TRACK3 pins to the VFB1 pin. With a ratiometric congura-
tion, the LTC3773 produces three different output slew
rates. Because each channel’s slew rate is proportional to
its corresponding output voltage, the three output voltages
reach their steady-state values at about the same time.
If a slave rail will be shut down with its SDB pin while
VOUT1 remains on, then connect the slave’s TRACK pin
to its own divider instead of VFB1. Otherwise, VOUT1 will
go up when the slave is turned off.
To implement coincident tracking, connect extra resistor
dividers to the output of channel 1. These resistor dividers
are selected to be the same as the VFB dividers across
the outputs of channels 2 and 3. TRACK2 and TRACK3
are connected to these extra resistor dividers as shown
in Figure 5b. In this tracking scheme, VOUT1 must be set
higher than VOUT2 and VOUT3. The coincident congura-
tion produces the same slew rate at the three outputs,
so that the lowest output voltage channel reaches its
steady state rst.
The TRACK pin 1A internal pull-up current performs the
soft-start action, but in tracking mode it introduces an
error term in the resistive divider. To minimize this error,
build the resistive divider with smaller value resistors, or
add an extra tracking resistive divider. When the tracking
resistive divider input is grounded, the pull-up current ow-
ing through the network could produce a small unwanted
offset at the TRACK pin, forcing the controller to create
APPLICATIONS INFORMATION
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| LTC3803IS6-3 | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
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相關代理商/技術參數 |
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| LTC3773EUHF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數:1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3774EUHE#PBF | 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, DFN-36 |
| LTC3774IUHE#PBF | 制造商:Linear Technology 功能描述:SWITCHING REG, BUCK, ADJ, 2.2MHZ, DFN-36 |
| LTC3775EMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 16-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數:1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
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