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| 型號： | S-8521F32MC-BPR-T2G |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | LEAD FREE, SOT-23, 5 PIN |
| 文件頁數(shù)： | 6/44頁 |
| 文件大小： | 511K |
| 代理商： | S-8521F32MC-BPR-T2G |
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STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8520/8521 Series
Rev.9.0_00
Seiko Instruments Inc.
14
2.
Soft start function
The S-8520/8521 Series has a built-in soft start-circuit. This circuit enables the output voltage (VOUT) to rise
gradually over the specified soft start time (t), when power-on or when the ON/OFF
______
pin is at the “H” level. This
prevents the output voltage from overshooting.
However, the soft-start function of this IC is not able to perfectly prevent a rush current from flowing to the load
(Refer to Figure 8). Since this rush current depends on the input voltage and load conditions, Perform sufficient
evaluation with actual device for design.
S-8520A33MC (VIN: 0 V→4.0 V)
t [1 ms/div]
VOUT
[1 V/div]
Rush current
[0.5 A/div]
0 A
1.5 A
3 V
0 V
Figure 8
Waveforms of output voltage and rush current at soft start
3.
ON/OFF
_______
pin (Shutdown pin)
The ON/OFF
______
pin stops or starts step-up operation.
Setting the ON/OFF
______
pin to the “L” level stops operation of all the internal circuits and reduces current consumption
significantly. The EXT pin’s voltage is set to the VIN voltage level so that the switching transistor is turned off.
Do not use the ON/OFF
______
pin in a floating state because it has the structure shown in Figure 9 and is not pulled up
or pulled down internally. Do not apply a voltage of between 0.3 V and 1.8 V to the ON/OFF
______
pin because applying
such a voltage increases the current consumption. When not using the ON/OFF
______
pin, connect it to the VIN pin.
Table 8
ON/OFF
______
pin
CR Oscillation Circuit
Output voltage
“H”
Operation
Set value
“L”
Stop
VSS
VIN
VSS
ON/OFF
______
Figure 9
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