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參數(shù)資料
| 型號(hào)： | AN8015SH |
| 廠商： | PANASONIC CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Single-channel step-down, step-up, or inverting use DC-DC converter control IC |
| 中文描述： | 0.1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | SSOP-10 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大小： | 131K |
| 代理商： | AN8015SH |
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10
AN8015SH
Voltage Regulators
I
Application Notes (continued)
[3] Function descriptions (continued)
5. Low input voltage malfunction prevention circuit (U.V.L.O.)
This circuit protects the system from destruction or deterioration due to control malfunction when the supply
voltage is low in the transient state of power on/off.
The low input voltage malfunction prevention circuit detects the internal reference voltage which changes
according to the supply voltage level. Until the supply voltage reaches 3.1 V during its rise time, it cuts off the the
output drive transistor, sets the dead-time at 100% and holds the S.C.P. terminal (pin 3) to low level. During the
fall time of the power supply voltage, it has hysteresis width of 200 mV and operates 2.9 V or less.
6. PWM comparator block
The PWM comparator controls the on-period of the output pulse according to the input voltage. It turns on the
output transistor during the period when the triangular wave of CT terminal (pin 1) of noninverted input is lower
than any one of the following voltages : the voltage of the error amplifier output (pin 10) of the inverted input, S.C.P.
terminal (pin 3), and the voltage for dead-time which is fixed inside the IC.
The S.C.P. terminal voltage is kept at 1.25 V in the state in which DC-DC converter output is stabilized.
However, when the power supply is turned on, the soft start is activated, which gradually extends on-period
according to the time constant determined by the capacitance of externally attached capacitor and the charge current.
The maximum duty ratio is fixed at approximately 90% by the voltage for dead-time.
7. Output block
The output drive transistor is of open-collector type output connected in darlington circuit of emitter common
GND. The breakdown voltage of collector output terminal (pin 5) is 34 V and it is possible to obtain up to 100 mA
output current.
[4] Triangular wave oscillation circuit
1. 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 (pin 1). 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 0.37 V typical respectively.
The oscillation frequency f
OSC
is obtained by the
following formula;
1
=
t
1
+ t
2
2
×
C
T
×
(V
CTH
V
CHL
)
I
O
=
2
×
V
RT
=
2
×
0.5
R
T
R
T
because
V
CTH
V
CTL
=
0.83 V
1
1.66
×
C
T
×
R
T
The output frequency f
OUT
is equal to f
OSC
since it is PWM-controlled.
f
OSC
=
I
O
whereas
f
OSC
=
t
2
t
1
T
V
CTH
=
1.4 V typ.
V
CTL
=
0.37 V typ.
Figure 4. Triangular wave oscillation waveform
Charging Discharging
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相關(guān)代理商/技術(shù)參數(shù) |
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| AN8015SH-E1 | 功能描述:IC REG CTRLR BST INV PWM 10-SSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無(wú) 升壓:無(wú) 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF) |
| AN8015SH-E1V | 功能描述:IC REG CTRLR BST INV PWM SSOP10 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無(wú) 升壓:無(wú) 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF) |
| AN8016 | 制造商:PANASONIC 制造商全稱(chēng):Panasonic Semiconductor 功能描述:Single-channel 1.8-volt step-up DC-DC converter control IC |
| AN8016NSH | 制造商:PANASONIC 制造商全稱(chēng):Panasonic Semiconductor 功能描述:Single-channel 1.8-volt step-up DC-DC converter control IC |
| AN8016NSHAVF | 功能描述:IC REG CTRLR BST PWM SSOP10 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無(wú) 升壓:是 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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