参数资料
型号: LTC3856EUH#PBF
厂商: Linear Technology
文件页数: 27/40页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32WFQFN
标准包装: 73
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 850kHz
占空比: 94%
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: 32-WFQFN 裸露焊盘
包装: 管件
LTC3856
APPLICATIONS INFORMATION
V OUT1
V OUT2
V OUT1
V OUT2
TIME
3856 F11a
TIME
3856 F11b
(11a) Coincident Tracking
(11b) Ratiometric Tracking
Figure 11. Two Different Modes of Output Voltage Tracking
V OUT1
V OUT2
V OUT1
V OUT2
TO
TK/SS2
PIN
R3
R4
R1
R2
TO
V FB1
PIN
TO
V FB2
PIN
R3
R4
TO
TK/SS2
PIN
R1
R2
TO
V FB1
PIN
TO
V FB2
PIN
R3
R4
3856 F12
(12a) Coincident Tracking Set-Up
(12b) Ratiometric Tracking Set-Up
Figure 12. Set-Up and Coincident and Ratiometric Tracking
is needed to supply the high transient currents required
by the MOSFET gate drivers and to prevent interaction
between the channels.
High input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the maxi-
mum junction temperature rating for the LTC3856 to be
exceeded. The INTV CC current, which is dominated by the
gate charge current, may be supplied by either the 5V LDO
or EXTV CC . When the voltage on the EXTV CC pin is less
than 4.7V, the LDO is enabled. Power dissipation for the
IC in this case is highest and is equal to V IN ? I INTVCC . The
gate charge current is dependent on operating frequency
as discussed in the Efficiency Considerations section.
The junction temperature can be estimated by using the
equations given in Note 3 of the Electrical Characteristics
table. For example, the LTC3856 INTV CC current is limited
to less than 42mA from a 38V supply in the UH package
and not using the EXTV CC supply:
T J = 70°C + (42mA)(38V)(34°C/W) = 125°C
To prevent the maximum junction temperature from be-
ing exceeded, the input supply current must be checked
while operating in continuous conduction mode (MODE
= SGND) at maximum V IN . When the voltage applied to
EXTV CC rises above 4.7V, the INTV CC LDO is turned off
and the EXTV CC is connected to the INTV CC . The EXTV CC
remains on as long as the voltage applied to EXTV CC remains
above 4.5V. Using the EXTV CC allows the MOSFET driver
and control power to be derived from one of switching
regulator outputs during normal operation and from the
INTV CC when the output is out of regulation (e.g., start-up,
3856f
  
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