参数资料
型号: LTC3828EUH#TRPBF
厂商: Linear Technology
文件页数: 15/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32-QFN
标准包装: 2,500
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:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 带卷 (TR)
LTC3828
APPLICATIONS INFORMATION
TRCKSS2
V OUT2
V OUT1
LTC3828
R4
R5
R1
“MASTER”
R3
V OSENSE1 V OSENSE2
V OUT1
R2
R2
R2
TRCKSS1
R2
C SS
V OUT3
V OUT3
TRCKSS1 TRCKSS2
V OUT4
V OUT4
LTC3828
R4
“SLAVE”
R5
V OUT2
V OSENSE1 V OSENSE2
R2
R2
TIME
3828 F08
(8a) Circuit Setup
(8b) Output Voltage
? R 1 V OUT 1 R 3 V OUT 2 R 4 V R 5 V ?
? ? R 2 0 . 8 – 1 , R 2 0 . 8 – 1 R 2 0 .88 – 1 , R 2 0 . 8 – 1 ? ?
Figure 8. Four Outputs with Tracking and Ratiometric Sequencing
= = = OUT 3 = OUT 4
to 1.1(INTV CC ). The current comparator threshold sets the
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, Δ I L .
Allowing a margin for variations in the IC and external
component values yields:
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
ef?ciency (see Ef?ciency Considerations). The maximum
switching frequency is approximately 550kHz.
2.5
R SENSE =
50mV
I MAX
2.0
1.5
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 criterion
for buck regulators operating at greater than 50% duty
factor. A curve is provided to estimate this reduction in
1.0
0.5
peak output current level depending upon the operating
duty factor.
0
200
300 400 500
OPERATING FREQUENCY (kHz)
600
3828 F09
Operating Frequency
The IC uses a constant frequency phase-lockable ar-
chitecture with the frequency determined by an internal
capacitor. This capacitor is charged by a ?xed 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.
Figure 9. PLLFLTR Pin Voltage vs Frequency
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 ef?ciency. A higher
frequency generally results in lower ef?ciency because
3828fc
15
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