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参数资料
| 型号： | LTC3828 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | 16-Bit Bus Transceiver With 3-State Outputs 48-SSOP -40 to 85 |
| 中文描述： | 双2相降压型跟踪控制器 |
| 文件页数： | 15/32页 |
| 文件大小： | 396K |
| 代理商： | LTC3828 |
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LTC3828
3828f
15
Figure 8. Four Outputs with Tracking and Ratiometric Sequencing
.
.
V
OSENSE1
TRCKSS1
C
SS
R3
R1
R2
R5
V
OUT1
R2
R4
R2
R2
V
OSENSE2
V
OUT2
R5
R2
V
OUT4
R4
R2
V
OUT3
TRCKSS2
LTC3828
“MASTER”
TRCKSS1
V
OSENSE1
V
OSENSE2
TRCKSS2
LTC3828
“SLAVE”
(8a) Circuit Setup
TIME
3828 F08
(8b) Output Voltage
V
OUT1
V
OUT3
V
OUT4
V
OUT2
O
APPLICATIOU
W
U
U
R
R
V
R
R
V
R
R
V
R
R
V
OUT
0 8
OUT
0 8
OUT
0 8
.
OUT
0 8
.
1
2
1
3
2
14
2
1
5
2
1
1
2
3
4
=
=
=
=
– ,
–
– ,
–
peak of the inductor current, yielding a maximum average
output current I
MAX
equal to the peak value less half the
peak-to-peak ripple current,
I
L
.
Allowing a margin for variations in the IC and external
component values yields:
R
mV
I
SENSE
MAX
=
50
When using the controller in very low dropout conditions,
the maximum output current level will be reduced due to
the internal compensation required to meet stability crite-
rion for buck regulators operating at greater than 50%
duty factor. A curve is provided to estimate this reduction
in peak output current level depending upon the operating
duty factor.
Operating Frequency
The IC uses a constant frequency phase-lockable architec-
ture with the frequency determined by an internal capaci-
tor. This capacitor is charged by a fixed current plus an
additional current which is proportional to the voltage
applied to the PLLFLTR pin. Refer to Phase-Locked Loop
and Frequency Synchronization in the Applications Infor-
mation section for additional information.
A graph for the voltage applied to the PLLFLTR pin vs
frequency is given in Figure 9. As the operating frequency
is increased the gate charge losses will be higher, reducing
efficiency (see Efficiency Considerations). The maximum
switching frequency is approximately 550kHz.
Figure 9. PLLFLTR Pin Voltage vs Frequency
OPERATING FREQUENCY (kHz)
200
300
400
500
600
P
3828 F09
2.5
2.0
1.5
1.0
0.5
0
Inductor Value Calculation
The operating frequency and inductor selection are inter-
related in that higher operating frequencies allow the use
of smaller inductor and capacitor values. So why would
anyone ever choose to operate at lower frequencies with
larger components The answer is efficiency. A higher
frequency generally results in lower efficiency because of
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| LTC3828EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP 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 |
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| 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 |
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