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參數資料
| 型號： | LA5681FN |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 520 kHz SWITCHING FREQ-MAX, QCC48 |
| 封裝： | 7 X 7 MM, VQFN-48 |
| 文件頁數： | 9/19頁 |
| 文件大?。?/td> | 308K |
| 代理商： | LA5681FN |
LA5681FN
No.A0374-17/19
CT1 and CT2
CT1 and CT2 are of the waveform displaced in the phase by 180 degrees. The frequency cannot be set independently.
Set capacitors CT1 and CT2 to be connected to the same value.
Oscillation frequency setting
(1) The oscillation frequency can be set on the basis of the capacitance connected to CT1 and CT2 pins.
(See Fig. 1)
(2) The oscillation frequency can be set on the basis of the resistance connected to the RT pin.
Sample circuit using VBIAS1 (similar in the case of VBIAS2)
As shown below is possible because power supply at the output stage is provided by VBIAS1.
The voltage of 5V stepped up in CH6 is applied to VBIAS1 to obtain VO1 = 1.8V.
For the change of VBATT = 1.5 to 3.2V, VO1 = 1.8V is either stepped up or stepped down.
Sample VBIAS1 circuit application
To IN1-
VBIAS1
OUT1
OC
VBATT
VBATT = 1.5 to 3.2V
CAPH
CAPL
START-UP
V
O
1 = 1.8V
To IN6-
To OUT6
To V
CC
Note) Use the external Nch_MOS source and VBIAS1 on the same potential.
V
O
6 = 5V
0
800
1000
1200
400
600
200
1400
0
800
1000
1200
1400
1600
1800
400
600
200
2000
110
7
5
3
27
5
3
2
100
1k
7
5
3
27
5
3
2
10k
Setting resistance, RT – k
Ω
Oscillation
frequency
,f
–
kHz
Oscillation frequency – timing capacitance characteristic
Capacitor, CT – pF
Oscillation
frequency
,f
–
kHz
Oscillation frequency – timing resistance characteristic
Ta = 25°C
VCC = 3.0V
CT1/CT2 = 560pF
Reference data
Ta = 25°C
VCC = 3.0V
RT = 5.6k
Ω
(CT1 and CT2 have
the same capacitance)
Reference data
Fig. 1
Fig. 2
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