参数资料
型号: ISL6146CFRZ-T
厂商: Intersil
文件页数: 20/28页
文件大小: 0K
描述: IC OR CONTROLLER
标准包装: 6,000
系列: *
ISL6146
prevents that when Q1 is on regardless of the V BATT voltage.
The ISL6146 bias is pulled from the common drain node to
ensure an always adequate bias from either source when the
other is absent
Q1
V EXT SWITCHED
3.3V - 24V OUTPUT
All of the scope shots were taken with a 5A load and 100μF of
bulk load capacitance.
Figure 52 is a ISL6146A switchover circuit to use where the
preferred V EXT source is always greater than the V BATT . Because
this is so, there is no need for a 3rd FET for blocking as in
Figure 50. Additionally, the preferred V EXT source when present
or at a programmed minimum threshold voltage via R1 and R2
divider will turn on Q2/turn-off Q1 but when absent or not
V BATT
3.3V-20V
Q2
Q3
Use when V BATT > V EXT
Q3 disconnects V BATT from
output when GATE is off.
minimally adequate, will do the opposite. In this circuit, with the
ISL6146A not connected to the battery, and thus no constant I VIN
load on it, which allows for longer battery life.
Bias voltage is pulled from the common output to ensure an
always adequate IC bias from either source.
VIN
GATE
VOUT
R1
BIAS
EN
ISL6146B
GND
FLT
ADJ
R3
V BATT
Q1
SWITCHED
OUTPUT
R2
V EXT
Q2
Use when V BATT < V EXT
FIGURE 50. ISL6146B EXTERNAL SWITCHOVER SCHEMATIC
Figure 51 shows operational scope shots of the above circuit.
VIN
BIAS
GATE
VOUT
FLT
BATT SUPPLY
EXT SUPPLY
R1
EN
ISL6146A
GND
ADJ
R2
VOUT
FIGURE 53. ISL6146A EXTERNAL SWITCHOVER SCHEMATIC
GATE
BATT SUPPLY
FIGURE 51. EXTERNAL SUPPLY < BATT SUPPLY CONNECTED
BATT SUPPLY
EXT SUPPLY
VOUT
EXT SUPPLY
GATE
VOUT
FIGURE 54. EXTERNAL SUPPLY > BATT SUPPLY CONNECTED
GATE
FIGURE 52. EXTERNAL SUPPLY < BATT SUPPLY DISCONNECTED
20
FN7667.4
April 26, 2013
相关PDF资料
PDF描述
ISL6146CFRZ IC OR CONTROLLER
ISL6146BFRZ-TK IC OR CONTROLLER
ISL6146BFRZ-T IC INTERFACE
ISL6146BFRZ IC INTERFACE
ISL6146AFRZ-TK IC INTERFACE
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