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参数资料
| 型号： | ISL6292-1CR5-T |
| 厂商： | INTERSIL CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-TSSOP -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封装： | 5 X 5 MM, PLASTIC, MO-220VHHB, QFN-16 |
| 文件页数： | 8/20页 |
| 文件大小： | 550K |
| 代理商： | ISL6292-1CR5-T |
16
FN9105.9
December 17, 2007
If the battery pack voltage reaches 4.2V (or 4.1V) before the
adapter reaches point B in Figure 24, a voltage step is
expected at the adapter output when the pack voltage
reaches the final charge voltage. As a result, the charger
power dissipation is also expected to have a step rise. This
condition, the worst case thermal dissipation in the charger
happens when the charger enters the constant voltage
mode.
If the adapter voltage reaches the full-load voltage before the
pack voltage reaches 4.2V (or 4.1V), the charger will
experience the resistance-limit situation. In this situation, the
ON-resistance of the charger is in series with the adapter
output resistance. The equivalent circuit for the resistance-limit
region is shown in Figure 25B. Eventually, the battery pack
voltage will reach 4.2V (or 4.1V) because the adapter no-load
voltage is higher than 4.2V (or 4.1V), then Figure 25C becomes
the equivalent circuit until charging ends. In this case, the
worst-case thermal dissipation also occurs in the constant-
current charge mode. Figure 26B shows the I-V curves of the
adapter output, the battery pack voltage and the cell voltage for
the case VFL = 4V. In the case, the full-load voltage is lower
than the final charge voltage (4.2V), but the charger is still able
to fully charge the battery as long as the no-load voltage is
above 4.2V. Figure 26B illustrates the adapter voltage, battery
pack voltage, the charge current and the power dissipation in
the charger respectively in the time domain.
Based on the previous discussion, the worst-case power
dissipation occurs during the constant-current charge mode
if the adapter full-load voltage is lower than the critical
voltage given in Equation 14. Even if that is not true, the
power dissipation is still much less than the power
dissipation in the traditional linear charger. Figures 28 and
29 are scope-captured waveforms to demonstrate the
operation with a current-limited adapter.
The waveforms in Figure 28 are the adapter output voltage
(1V/div), the battery voltage (1V/div), and the charge current
(200mA/div) respectively. The time scale is 1ks/div. The
adapter current is limited to 600mA and the charge current is
programmed to 1A. Note that the voltage difference is only
approximately 200mV and the adapter voltage tracks the
battery voltage in the CC mode. Figure 28 also shows the
resistance-limit mode before entering the CV mode.
Figure 29 shows the actual captured waveforms depicted in
Figure 27C. The constant charge current is 750mA. A step in
the adapter voltage during the transition from CC mode to
CV mode is demonstrated.
FIGURE 25A. THE EQUIVALENT CIRCUIT IN
THE CONSTANT CURRENT
REGION
FIGURE 25B. THE EQUIVALENT CIRCUIT IN
THE RESISTANCE-LIMIT
REGION
FIGURE 25C. THE EQUIVALENT CIRCUIT WHEN
THE PACK VOLTAGE REACHES
THE FINAL CHARGE VOLTAGE
FIGURE 25. THE EQUIVALENT CIRCUIT OF THE CHARGING SYSTEM WORKING WITH CURRENT LIMITED ADAPTERS
V
ADAPTER
V
PACK
V
CELL
R
DS(ON)
R
PACK
Charger
I
Adapter
I
LIM
Battery
Pack
V
ADAPTER
V
PACK
V
CELL
R
PACK
Charger
I
r
O
Adapter
V
NL
Battery
Pack
R
DS(ON)
V
ADAPTER
V
PACK
V
CELL
R
PACK
Charger
I
r
O
Adapter
V
NL
Battery
Pack
4.2V DC
Output
FIGURE 26A.
FIGURE 26B.
FIGURE 26. THE I-V CHARACTERISTICS OF THE CHARGER
WITH DIFFERENT CURRENT LIMITED ADAPTERS
0.75A
4.4625V
5.9V
4.2V
4.05V
4.2V
V
ADAPTER
V
CELL
V
PACK
0.75A
4.0V
V
NL
0.55A
4.2V
3.625V
3.775V
V
ADAPTER
V
CELL
V
PACK
4.2V
ISL6292
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