参数资料
型号: LTC3865IFE#TRPBF
厂商: Linear Technology
文件页数: 20/38页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 38TSSOP
标准包装: 2,000
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 880kHz
占空比: 95%
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
包装: 带卷 (TR)
LTC3865/LTC3865-1
APPLICATIONS INFORMATION
V OUT1
V OUT2
V OUT1
V OUT2
TIME
TIME
3865 F05
(5a) Coincident Tracking
(5b) Ratiometric Tracking
Figure 5. Two Different Modes of Output Voltage Tracking
V OUT1
V OUT2
V OUT1
V OUT2
TO
TK/SS2
PIN
nR3
nR4
R1
R2
TO TO
EA1 EA2
R3
R4
TO
TK/SS2
PIN
nR1
nR2
R1
R2
TO TO
EA1 EA2
R3
R4
38551 F06
(6a) Coincident Tracking Setup
(6b) Ratiometric Tracking Setup
Figure 6. Setup for Coincident and Ratiometric Tracking
I
I
+
TK/SS2
0.6V
D1
D2
D3
EA2
3865 F07
V FB2
Figure 7. Equivalent Input Circuit of Error Ampli?er
shown in Figure 6a. In this tracking mode, V OUT1 must
be set higher than V OUT2 . To implement the ratiometric
tracking, the ratio of the V OUT2 divider should be exactly
the same as the master channel’s internal feedback divider.
By selecting different resistors, the LTC3865/LTC3865-1
can achieve different modes of tracking including the two
in Figure 5.
So which mode should be programmed? The coincident
mode offers better output regulation. This can be better
understood with the help of Figure 7. At the input stage
of the slave channel’s error ampli?er, two common an-
ode 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 magnitude. In coincident mode, the TK/SS
voltage is substantially higher than 0.6V at steady state and
effectively turns off D1. D2 and D3 will therefore conduct
the same current and offer tight matching between V FB2
and the internal precision 0.6V at steady state. In the
ratiometric mode, however, TK/SS equals 0.6V at steady
state. D1 will divert part of the bias current to make V FB2
slightly lower than 0.6V. Although this error is minimized
by the exponential I-V characteristics of the diode, it does
impose a ?nite amount of output voltage deviation.
3865fb
20
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