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參數(shù)資料
| 型號(hào)： | LTC4000EUFD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220WXXX-X, QFN-28 |
| 文件頁數(shù)： | 22/40頁 |
| 文件大小： | 428K |
| 代理商： | LTC4000EUFD#PBF |
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LTC4000
29
4000f
applicaTions inForMaTion
With CC = 1F, RC = 10k at VIN = 20V, VBAT = 7V, VCSP
regulated at 9.8V and a 0.2A output load condition at
CSP, the transient response for a 100mA charge current
step observed at IBMON is shown in Figure 16.
The transient response now indicates an overall under
dampedsystem.Asnotedintheempiricalloopcompensa-
tion section, the value of RC is now increased iteratively
until RC = 20k. The transient response of the same loop
with CC = 22nF and RC = 20k is shown in Figure 18.
Figure 16. Transient Response of Charge Current Regulation Loop
Observed at IBMON When VOFB is Regulated to VOUT(INST_ON) with
CC = 1F, RC = 10k for a 100mA Charge Current Step
5ms/DIV
–20
V IBMON
(mV)
5mV
/DIV
15
–10
–5
0
5
10
–15
10
5
15
4000 F16
25
20
0
–10 –5
–15
The transient response shows a small overshoot with slow
settling indicating a fast minor loop within a well damped
overall loop. Therefore, the value of CC is reduced itera-
tively until CC=22nF. The transient response of the same
loop with CC = 22nF and RC = 10k is shown in Figure 17.
Figure 17. Transient Response of Charge Current Regulation Loop
Observed at IBMON When VOFB is Regulated to VOUT(INST_ON) with
CC = 22nF, RC = 10k for a 100mA Charge Current Step
Figure 18. Transient Response of Charge Current Regulation Loop
Observed at IBMON When VOFB is Regulated to VOUT(INST_ON) with
CC = 22nF, RC = 20k for a 100mA Charge Current Step
5ms/DIV
–20
V IBMON
(mV)
5mV
/DIV
15
–10
–5
0
5
10
–15
10
5
15
4000 F17
25
20
0
–10 –5
–15
5ms/DIV
–20
V IBMON
(mV)
5mV
/DIV
15
–10
–5
0
5
10
–15
10
5
15
4000 F18
25
20
0
–10 –5
–15
Note that the transient response is close to optimum
with some overshoot and fast settling. If after iteratively
increasing the value of RC, the transient response again
indicates an over damped system, the step of reducing
CC can be repeated. These steps of reducing CC followed
by increasing RC can be repeated continuously until one
arrives at a stable loop with the smallest value of CC and
the largest value of RC. In this particular example, these
values are found to be CC = 22nF and RC = 20kΩ.
AfterarrivingatthesefinalvaluesofRCandCC,thestability
margin is checked by varying the values of both RC and
CC by 2:1 in all four possible combinations. After which
the setup condition is varied, including varying the input
voltage level and the output load level and the transient
response is checked at these different setup conditions.
Once the desired responses on all different conditions are
obtained, the values of RC and CC are noted.
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