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參數(shù)資料
| 型號： | AN8049 |
| 廠商： | Panasonic Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC |
| 中文描述： | 1.8伏3通道升壓，降壓，和極性倒轉(zhuǎn)DC - DC轉(zhuǎn)換器控制IC |
| 文件頁數(shù)： | 16/23頁 |
| 文件大?。?/td> | 170K |
| 代理商： | AN8049 |
AN8049FHN
Voltage Regulators
16
I
Application Notes (continued)
[4] Function descriptions (continued)
4. Error amplifier 2
This circuit is an npn-transistor input error
amplifier that detects and amplifies the DC-DC
converter output voltage, and inputs that signal to
a PWM comparator. The 1.26 V internal reference
voltage is applied to the noninverting input. Arbi-
trary gain and phase compensation can be set up
by inserting a resistor and capacitor in series be-
tween the FB2 pin (pin 20) and the IN
2 pin (pin
19). The output voltage V
OUT2
can be set using the
circuit shown in the figure.
5. Error amplifier 3
This circuit is a pnp-transistor input error amplifier that detects and amplifies the DC-DC converter output
voltage and inputs that signal to a PWM comparator. Arbitrary gain and phase compensation can be set up by
inserting a resistor and capacitor in series between the FB3 pin (pin 18) and the IN
3 pin (pin 17). The output voltage
V
OUT3
can be set using the circuit shown in the figure.
Step-down output
Inverting output
Figure 4. Connection method of error amplifier 3
6. Timer latch short-circuit protection circuit
This circuit protects the external main switching elements, flywheel diodes, choke coils, and other components
against degradation or destruction if an excessive load or a short circuit of the power supply output continues for
longer than a certain fixed period.
The timer latch short-circuit protection circuit detects the output of the error amplifiers. If the DC-DC converter
output voltage drops and an FB pin (pins 18, 20, or 22) voltage exceeds 0.9 V, the S.C.P. comparator outputs a low
level and the timer circuit starts. This starts charging the external protection circuit delay time capacitor.
If the error amplifier output does not return to the normal voltage range before that capacitor reaches 1.26 V,
the latch circuit latches, the output drive transistors are turned off, and the dead-time is set to 100%.
Figure 3. Connection method of error amplifier 2 (Step-up output)
19
20
1.26 V
IN
2
To the PWN
comparator input
R2
R1
FB2
V
OUT2
Error
amplifier 2
V
OUT2
=
1.26
×
R
1
+
R
2
R
2
IN
3
IN
+
3
To the PWM
comparator input
R4
R3
R2
R1
FB3
V
OUT3
V
REF
Error
amplifier 3
V
OUT3
=
R
1
+R
2
×
R
3
+
R
4
×
V
REF
R
4
R
2
16
17
18
IN
3
IN
+
3
To the PWM
comparator input
R2
R1
FB3
V
REF
V
OUT3
Error
amplifier 3
V
OUT3
=
V
REF
×
R
2
R
1
16
17
18
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相關(guān)代理商/技術(shù)參數(shù) |
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| AN8049FHN | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC |
| AN8049FHN-EB | 功能描述:IC REG BUCK BOOST INV 40MA 24QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標(biāo)準(zhǔn)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(guān):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(yīng)商設(shè)備封裝:VQFN020V4040 產(chǎn)品目錄頁面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR |
| AN8049FHNEBV | 功能描述:IC REG BUCK BOOST INV 40MA 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:升壓（升壓） 輸出類型:兩者兼有 輸出數(shù):1 輸出電壓:5V，2 V ~ 16.5 V 輸入電壓:2 V ~ 16.5 V PWM 型:- 頻率 - 開關(guān):45kHz 電流 - 輸出:50mA 同步整流器:無 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:8-PDIP |
| AN8049SH | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC |
| AN8049SH-E1 | 功能描述:IC REG BUCK BST INV 40MA 24SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:High Efficiency Current Mode Switching Regulators CMOS LDO Regulators 特色產(chǎn)品:BD91x Series Step-Down Regulators 標(biāo)準(zhǔn)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(guān):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(yīng)商設(shè)備封裝:VQFN020V4040 產(chǎn)品目錄頁面:1373 (CN2011-ZH PDF) 其它名稱:BD9152MUV-E2TR |
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