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参数资料
| 型号： | L6920 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, PDSO8 |
| 封装： | 4.40 MM, TSSOP-8 |
| 文件页数： | 9/12页 |
| 文件大小： | 162K |
| 代理商： | L6920 |
L6920
6/12
Figure 5.1. 1 PFM mode Condition: Vout = 5V; Vin
=1.5V. Trace1: Vout (50mV~/div) Trace
4: IL (100mA/div) Time div.: 5
s/div
Figure 5.2. Heavier load - Train pulses overlapping.
Trace1: Vout (100mV~/div) Trace 4: IL
(200mA/div) Time div.: 10
s/div
When Iload is heavier, then train pulses are over-
lapped. Figures 5.2 - 5.4 show some possible behav-
iors.
Figure 5.3. Heavy load - Inductor current ripples
below Ilim Trace1: Vout (100mV~/div)
Trace 4: IL (200mA/div) Time div.: 20 s/div
Figure 5.4. Heavy load and High ESR. Regulation
falls in continuous mode of operation.
Trace1: Vout (100mV~/div) Trace 4: IL
(200mA/div). Time div.: 5
s/div
Considering that current in the inductor is limited to
1A, the maximum load current is defined by the fol-
lowing relationship:
eq. (1)
Where h is the efficiency and Ilim =1A.
Of course, if Iload is greater than Iload_lim the regu-
lation is lost (figure 6).
I
lo ad_lim
V
in
V
out
-----------
I
lim
V
out
V
in
–
2L
--------------------------
–
η
=
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| L6920DCTR | 功能描述:直流/直流开关调节器 Sync Rectifier Step Up Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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