參數(shù)資料
型號(hào)： AN8018
廠商： Panasonic Corporation
元件分類(lèi)： DC/DC變換器
英文描述： 1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC
中文描述： 1.8伏雙通道升壓，降壓，或倒轉(zhuǎn)DC - DC轉(zhuǎn)換器控制IC
文件頁(yè)數(shù)： 16/26頁(yè)
文件大小： 268K
代理商： AN8018
16
AN8018SA
Voltage Regulators
I
Application Notes (continued)
[6] Time constant setting method for timer latch short-circuit protection circuit
The constructional block diagram of protection latch circuit is shown in figure 6. The comparator for short-circuit
protection compares the error amplifier 1 output FB1 with the reference voltage of 0.9 V for channel 1 side, and the
error amplifier 2 output FB2 with the reference voltage of 0.22 V for channel 2 side at all the time.
When the load conditions of DC-DC converter output is stabilized, there is no fluctuation of error amplifier
output and the short-circuit protection comparator also keeps the balance. At this moment, the output transistor Q1 is
in the conductive state and the S.C.P. terminal is held to approximately 60 mV.
When the load conditions for channel 1 side suddenly change and high-level signal (0.9 V or more) is input from
the error amplifier 1 block to the short-circuit protection comparator, the short-circuit protection comparator outputs
the low-level signal to cut off the output transistor Q1. Also, when the load conditions for channel 2 side suddenly
change and low-level signal (0.22 V or less) is inputted from the error amplifier 2 block to the short-circuit protection
comparator, the short-circuit protection comparator outputs the low-level signal to cut off the output transistor Q1.
The capacitor C
SCP
connected to the S.C.P. terminal starts charging. When the external capacitor C
SCP
has been charged
to approximately 1.19 V with the constant current of approximately 1.1
μ
A, the latch circuit is set, the output terminal
is fixed to low level, and the dead-time is set to 100%. Once the latch circuit is set, the S.C.P. terminal is discharged
to approximately 40 mV, However, the latch circuit is not reset unless the power for the latch circuit is turned off or
restarted by the on/off control.
t
PE
C
SCP
1.19 V
=
I
CHG
×
∴
t
PE
[s]
=
1.08
×
C
SCP
When the power supply is turned on, the output is
considered to be short-circuited state so that the S.C.P.
terminal voltage starts charging. It is necessary to set the
external capacitor so as to start up the DC-DC converter
output voltage before setting the latch circuit in the later
stage. Especially, pay attention to the delay of the start-up
time when applying the soft-start.
Figure 5. S.C.P. terminal charging waveform
V
SCP
[V]
t [s]
Short-circuit detection time t
PE
0.06
1.19
FB2 13
1.19 V
Q1
Error amp.2
S.C.P.
comp.
IN
+
2 14
S
0.22 V
High-level detection comp.
1.19 V
FB1 5
3Error amp.1
IN
+
1
4
IN
1
0.9 V
1.1
μ
A
U.V.L.O.
Q
R
S
On/off
control
Figure 6. Short-circuit protection circuit
Internal
reference
Latch
Output cut-off
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參數(shù)描述
AN8018SA 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC
AN8018SA-E1 功能描述:IC REG CTRLR BST INV PWM 16-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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 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:40-VFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
AN8018SA-E1V 功能描述:IC REG CTRLR BST INV PWM 16-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)
AN8019 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
AN-8019 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Reliable USB Modem Design Using the Combination of an Integrated Load Switch and a Buck Converter
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