- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375327 > AN8011S (PANASONIC CORP) 2-channel step-down, step-up, or inverting use DC-DC converter control IC PDF資料下載
參數(shù)資料
| 型號： | AN8011S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2-channel step-down, step-up, or inverting use DC-DC converter control IC |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.225 INCH, PLASTIC, SOP-16 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 161K |
| 代理商： | AN8011S |
13
Voltage Regulators
AN8011S
I
Application Notes (continued)
[5] Triangular wave oscillation circuit
Oscillation frequency setting method
The waveform of triangular wave oscillation is obtained by charging and discharging of the constant current I
O
from the external timing capacitor C
T
which is connected to CT terminal. The constant current is set by the externally
attached timing resistor R
T
.
The peak value of the wave V
CTH
and the trough
value of the wave V
CTL
are fixed at approximately 1.4 V
typical and 0.4 V typical respectively.
The oscillation frequency f
OSC
is obtained by the
following formula;
OSC
=
1
I
O
f
1
+
t
2
2
×
C
T
×
(V
CTH
V
CHL
)
Where I
V
RT
0.67
R
T
R
T
Because V
CTH
V
CTL
=
1V
OSC
=
0.67 [Hz]
f
T
×
R
T
The ouput frequency f
OUT
is equal to f
OSC
since it is PWM-controlled.
[6] Dead-time (maximum duty) setting method
The setting of the dead-time is conducted by adjusting the DTC terminal voltage V
DTC
as shown in figure 6. Since
the DTC terminal provides a constant current output through the resistor R
T
, V
DTC
is adjusted by attaching the external
resistor R
DTC
.
The output duty ratio Du and the DTC terminal voltage V
DTC
are expressed by the following formula. When the
oscillation frequency f
OSC
is 200 kHz, the output duty ratio is 0% at V
DTC
=
0.42 V, and 100% at V
DTC
=
1.35 V.
Pay attention to the peak volue and the trough value of triangular wave because the overshoot and undershoot
voltages depend on the frequency.
t
1
T
Figure 5. Triangular wave oscillation waveform
V
CTH
=
1.4 V typ.
V
CTL
=
0.4 V typ.
t
2
Charging
Discharging
t
OFF
V
CTH
V
DTC
DTC waveform
Out waveform
C
T
waveform
V
CTL
t
ON
Off
Off
On
V
REF
V
RT
R
T
I
DTC
Figure 6. Dead-time setting method
R
DTC
C
DTC
DTC
I
DTC
=
CT
FB
PWM
=
V
CTH
V
DTC
V
CTH
V
CTL
=
V
RT
×
×
1.04 [V]
V
=
I
DTC
×
R
DTC
(typ.)
R
DTC
R
T
100 [%]
×
1.04 [A]
×
Du
=
(typ.)
t
ON
t
ON
+
t
OFF
100 [%]
×
ex.) When f
OSC
=
200 kHz (R
T
=
20 k
, C
T
=
150 pF),
V
CTH
≈
1.4 V(typ.)
V
CTL
≈
0.4 V(typ.)
V
RT
≈
0.67 V(typ.)
I
DTL
≈
35
μ
A(typ.)
When the capacitor C
DTC
is added in parallel with the external resistor R
DTC
, the soft start function gradually extends
the on-period of the output pulse when the power supply is turned on. This prevents the overshoot of the DC-DC
converter output.
相關PDF資料 |
PDF描述 |
|---|---|
| AN8013SH | Single-channel step-up or step-down DC-DC converter control IC |
| AN8016 | Single-channel 1.8-volt step-up DC-DC converter control IC |
| AN8016NSH | Single-channel 1.8-volt step-up DC-DC converter control IC |
| AN8017SA | 1.8-volt 2-channel step-up DC-DC converter control IC |
| AN8021SB | AC-DC switching power supply control IC |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AN8011S-E1V | 功能描述:IC REG BUCK BST INV 2.5V DL SO16 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 產(chǎn)品培訓模塊:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):2 輸出電壓:3.3V，0.8 V ~ 2.5 V 輸入電壓:4.5 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關:1MHz 電流 - 輸出:1.5A 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:VQFN020V4040 產(chǎn)品目錄頁面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR |
| AN8013 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| AN8013D1 | 制造商:AN# - MILITARY 功能描述: |
| AN8013SH | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Single-channel step-up or step-down DC-DC converter control IC |
| AN8013SH-E1 | 功能描述:IC REG BUCK BST ADJ 0.1A 10SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 產(chǎn)品培訓模塊:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標準包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:兩者兼有 輸出數(shù):2 輸出電壓:3.3V，0.8 V ~ 2.5 V 輸入電壓:4.5 V ~ 5.5 V PWM 型:電流模式 頻率 - 開關:1MHz 電流 - 輸出:1.5A 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 包裝:帶卷 (TR) 供應商設備封裝:VQFN020V4040 產(chǎn)品目錄頁面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR |
發(fā)布緊急采購，3分鐘左右您將得到回復。