ISL6292EVAL2 Просмотр технического описания (PDF) - Renesas Electronics
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ISL6292EVAL2 Datasheet PDF : 20 Pages
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ISL6292
VIN
VPACK
VIN
VPACK
VIN
VPACK
Power
Const. Cur
Charge
Current
Constant Voltage
TIME
Power
Const. Cur
Res
Limit
Charge
Current
Constant Voltage
TIME
Power
Const. Cur
Charge
Current
Constant Voltage
FIGURE 27A.
FIGURE 27B.
FIGURE 27C.
FIGURE 27. THE OPERATING CURVES WITH THREE DIFFERENT CURRENT LIMITED ADAPTERS
TIME
IREF Programming Using Current-Limited Adapter
The ISL6292 has 10% tolerance for the charge current.
Typically the current-limited adapter also has 10% tolerance. In
order to guarantee proper operation, it is recommended that
the nominal charge current be programmed at least 30%
higher than the nominal current limit of the adapter.
Board Layout Recommendations
The ISL6292 internal thermal foldback function limits the
charge current when the internal temperature reaches
approximately +100°C. In order to maximize the current
capability, it is very important that the exposed pad under the
package is properly soldered to the board and is connected to
other layers through thermal vias. More thermal vias and more
copper attached to the exposed pad usually result in better
thermal performance. On the other hand, the number of vias is
limited by the size of the pad. The exposed pads for the 5x5
and 4x4 QFN packages are able to have 9 and 5 vias
respectively. The 3x3 DFN package allows 8 vias be placed in
two rows. Since the pins on the 3x3 DFN package are on only
two sides, as much top layer copper as possible should be
connected to the exposed pad to minimize the thermal
impedance. Refer to the ISL6292 evaluation boards for layout
examples.
CV Mode
CC Mode
Resistance Limit Mode
FIGURE 28. SCOPE CAPTURED WAVEFORMS SHOWING THE
THREE MODES
FN9105 Rev.9.00
December 17, 2007
1 hour
FIGURE 29. SCOPE CAPTURED WAVEFORMS SHOWING THE
CASE THAT THE FULL-LOAD ADAPTER
VOLTAGE IS HIGHER THAN THE CRITICAL
VOLTAGE
Page 17 of 20
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