參數(shù)資料
型號(hào)： AN8016
廠商： Panasonic Corporation
元件分類(lèi)： DC/DC變換器
英文描述： Single-channel 1.8-volt step-up DC-DC converter control IC
中文描述： 單聲道1.8伏升壓型DC - DC轉(zhuǎn)換器控制IC
文件頁(yè)數(shù)： 13/17頁(yè)
文件大?。?/td> 134K
代理商： AN8016
Voltage Regulators
AN8016NSH
13
I
Application Notes (continued)
[5] Time constant setup for the timer latch short-circuit protection circuit
Figure 4 shows the structure of the timer latch short-circuit protection circuit. The short-circuit protection
comparator continuously compares a 1.27 V reference voltage with the error amplifier output V
FB
.
When the DC-DC converter output load conditions are stable, the short-circuit protection comparator holds its
average value, since there are no fluctuations in the error amplifier outputs. At this time, the output transistor Q1
will be in the conducting state, and the S.C.P. pin will be held at about 60 mV.
If the output load conditions change rapidly and a high-level signal (1.27 V or higher) is input to the short-
circuit protection comparator's non-inverting input from the error amplifier, the short-circuit protection comparator
will output a low level and the output transistor Q1 will shut off. Then, the external capacitor C
S
connected to the
S.C.P. pin will start to charge. When the external capacitor C
S
is charged to about 1.27 V, the latch circuit will latch
and the off-period will be set to 100% with the output held fixed at the low level. Once the latch circuit has latched,
the S.C.P. pin capacitor will be discharged to about 40 mV, but the latch circuit will not reset unless either power
is turned off or the power supply is restarted using on/off control.
The capacitor C
S
is charged from 60 mV to about 230 mV with a time constant determined by a resistor of 6 k
,
and is charged from 230 mV to 1.26 V by a constant current of about 1.3
μ
A.
1) 0.06
≤
V
SCP
[V]
≤
0.23
V
SCP
=
(0.23
0.06)
×
{1
exp(
t
PE1
6k · C
S
)} [V]
t
PE1
[s]
≈
0.017
×
C
S
[mF]
2) 0.23
≤
V
SCP
[V]
≤
1.26
1.27 V = 0.23 V
+
I
CHG
×
t
PE2
C
S
t
PE2
[s]
≈
0.80
×
C
S
[
μ
F]
∴
t
PE
[s]
≈
t
PE1
+
t
PE2
≈
0.817
×
C
S
[
μ
F]
At power supply startup, the output appears to be in the shorted state, the error amplifier output goes to the high
level, and the IC starts to charge the S.C.P. pin capacitor. Therefore, users must select an external capacitor that allows
the DC-DC converter output voltage to rise before the latch circuit in the later stage latches. In particular, care is
required if the soft start function is used, since that function makes the startup time longer.
Figure 3. S.C.P. pin charging waveform
t
PE1
t
PE2
V
SCP
[V]
t [s]
Short-circuit detection time t
PE
0.06
0.23
1.27
FB 10
1.27 V
Q1
Error amp.
S.C.P. comp.
IN
1
S
Figure 4. Short-circuit protection circuit
1.27 V
High level detection comparator
1.27 V
3 k
3 k
1
μ
A
0.23 V
Internal reference
Output
shutoff
V
CC
C
S
U.V.L.O.
Q
R
S
Latch
On/off
control
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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)
AN8016NSH-E1 功能描述:IC REG CTRLR BST PWM 10-SSOP 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: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)
AN8016NSHE1V 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: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)
AN8016SHAE1V 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:75 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.3 V ~ 13.5 V 降壓:是 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:0°C ~ 70°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:管件 產(chǎn)品目錄頁(yè)面:1051 (CN2011-ZH PDF) 其它名稱(chēng):296-2543-5
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