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参数资料
| 型号： | LT3585EDDB-3#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.85 A BATTERY CHARGE CONTROLLER, PDSO10 |
| 封装： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10 |
| 文件页数： | 10/20页 |
| 文件大小： | 423K |
| 代理商： | LT3585EDDB-3#PBF |
LT3585-0/LT3585-1
LT3585-2/LT3585-3
18
3585f
TYPICAL APPLICATIO S
U
5
4
6
1
2
3
U1
VIN
3585 F15
TO
DONE
R3
100k
1/10W
0402
R1
5k
1/10W
0402
RT
100k
CT
0.1
mF
ENABLE
TO
CHRG/IADJ
U1: PANASONIC UP04979 COMPOSITE TRANSISTORS
Figure 15. Auto Refresh Application
VOUT
100V/DIV
CHRG/IADJ
2V/DIV
ENABLE
2V/DIV
2sec/DIV
LT3585-1
COUT = 50F
ENABLE < 0.3V
ENABLE > 1.1V
NORMAL OP.
AUTO
REFRESH
AUTO
REFRESH
ENABLE
<0.3V
ENABLE
>1.1V
ENABLE < 0.3V
3585 F16
VOUT
2V/DIV
AC RIPPLE
CHRG/IADJ
2V/DIV
200ms/DIV
LT3585-1
COUT = 50F
3585 F17
Figure 16. Auto Refresh Basic Operation
Figure 17. VOUT AC Ripple in Auto Refresh Mode
The LT3585 series can be auto-refreshed using the addi-
tional circuitry shown in Figure 15 with its basic operation
shown in Figure 16. The ENABLE pin is used to enable
or disable the auto-refresh charging mode. Without an
auto-refresh circuit, the output voltage will droop due to
output capacitor and output diode leakage currents. The
circuit in Figure 15 uses the DONE and CHRG/IADJ pins
to form an open-loop control scheme. The output voltage
target is sensed through the DONE pin with the PFET of
U1, Panasonic UP04979 composite transistor. When the
DONE pin goes low during the VOUT trip condition, the
PFET charges the auto-refresh timing node comprised
of RT and CT, and in turn, pulls the CHRG/IADJ pin low
through a NFET and disables the LT3585 series part. The
DONE pin immediately goes high in shutdown, releasing
the timing node and allowing the voltage at Pins 2 and 3
to decay. After approximately a RTCT time constant, the
CHRG/IADJ pin is released and the LT3585 series part is
enabled. This cycle is repeated to maintain a constant DC
output voltage. The open-loop control method places a
constraint on the control loop dominant time constant,
RT CT, given by:
RC
IL
IV
TT
PK
PRI
LK
BAT
>
2
where ILK is the known leakage current, IPK is the trans-
former peak primary current, and LPRI is the transformer
primary inductance. If this condition is not met, a runaway
condition could occur. The LT3585 series part would
continue to charge the output voltage past the internal
output trip voltage. Figure 17 shows the AC ripple of a
typical auto-refresh circuit with the proper selection of
RT and CT.
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