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参数资料
| 型号： | LTC4416IMS#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 10/12页 |
| 文件大小： | 209K |
| 代理商： | LTC4416IMS#TR |
LTC4416/LTC4416-1
4416fa
OPERATIO
U
The band-gap reference provides internal bias currents
used by the channel 1 and channel 2 controllers. It also
provides a precision voltage reference, VREF,usedbycom-
parators C1 and C2. The band-gap reference is powered
as long as a minimum operational voltage is present on
either V1, V2, or VS.
The C1 and C2 comparators provide a fixed comparison
between the E1 and E2 inputs, respectively, and the in-
ternal VREF signal. The comparator outputs are directly
represented by the H1 and H2 open-drain outputs. The
output states of H1 and H2 are not dependent upon
the relative voltage difference between VV1 – VVS and
VV2 – VVS, respectively. If VE1 is less than VREF, the H1
open-drain output will be low impedance to GND. If VE2
is less than VREF, the H2 open-drain output will be low
impedance to GND.
The A1 and A2 circuits act both as a high side
transconductance amplifiers and as comparators. Both
A1 and A2 act identically when the analog controllers
are fully enabled. The relationship of the G1 current is
represented by Figure 1.
When VV1 – VVS < VRTO, the A1 activates the reverse turn-
off condition and the IG1 current is IG(OFF). When VRTO <
VV1 – VVS < VFR, the A1 acts as a class A output and the
IG1 current is fixed at IG(SRC). As the VV1 – VVS voltage
VV1 – VVS
4416 F01
IG1
VRTO
VFR
VFON
IGFON(SNK)
IG(SNK)
IG(SRC)
IG(OFF)
NOT DRAWN TO SCALE
Figure 1. IG1 vs VV1 – VVS
approachestheforwardregulationvoltage,VFR,theIG(SNK)
current will be proportional to VV1 – VVS. When VV1 – VVS
> VFON, the A1 activates the fast-on condition, tG(ON), and
the IG1 current is set to IGFON(SNK).
LTC4416 OPERATION
The interaction of the LTC4416 analog controllers distin-
guish the operation of the LTC4416 from a simple circuit
using two PowerPath controllers. Table 1 explains the
different operation modes of the analog controllers.
Table 1. LTC4416 Operational Modes
E1
E2
Operation Mode
IG(OFF)1
IG(OFF)2
1
0
Load Sharing
Enabled
1
Sense V1 is Less Than V2
Enabled
Sense
0
V1 is Greater Than V2
Enabled
0
X
Channel 1 Disabled.
Do Not Use
Disabled
X
1
Channel 2 Disabled.
Do Not Use
Disabled
0
1
Both Channels Disabled
Disabled
The LTC4416 has six modes of operation. Each mode of
operation is dependent upon the configuration of the E1
and E2 input pins.
Load Sharing Operation
The load sharing mode configures the LTC4416 into two
independent PowerPath controllers. This is accomplished
by fully enabling both the first analog controller and the
second analog controller. Both channels will implement
the gate drive outlined in Figure 1.
V1 is Less Than V2 Operation
Channel 1 is fully enabled. If VV1 – VVS < VRTO, channel 1
will implement all of the IG1 currents listed in Figure 1.
When VE2 is above the VREF threshold, channel 2 is in a
“soft-off mode”. This means that G2 will only provide an
IG(SRC) current instead of either an IG(SRC) or an IG(OFF)
current.
When VE2 is below the VREF threshold, channel 2 is fully
enabled, and G2 will become active implementing the IG
output current listed in Figure 1.
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| LTC4417CUF#TRPBF | 制造商:Linear Technology 功能描述:Prioritized PowerPath Controller 24-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC OR CTRLR SRC SELECT 24QFN |
| LTC4417HGN#PBF | 制造商:Linear Technology 功能描述:Prioritized PowerPath Controller 24-Pin SSOP N 制造商:Linear Technology 功能描述:IC OR CTRLR SRC SELECT 24SSOP 制造商:Linear Technology 功能描述:MS-Hot Swap/Low Voltage, 2.5V to 36V Prioritized Triple PowerPath Controller |
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