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參數(shù)資料
| 型號： | AN8014S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Step-down, step-up, or inverting DC-DC converter control IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 151K |
| 代理商： | AN8014S |
Voltage regulators
AN8014S
9
I
Application Notes (continued)
[1] Function descriptions (continued)
4. Timer latch short-circuit protection circuit
This circuit protects external main switching devices, flywheel diodes, choke coils and so forth from breakdown
or deterioration when overload or short-circuit of power supply lasts a certain time.
Figure 3 shows the short-circuit protection circuit. The timer latch short-circuit protection circuit detects the
output level of the error amplifier.
If the output voltage of the DC-DC converter is stable, the output of the error amplifier from the FB pin is stable
and the short-circuit protection comparator is well balanced.
In that case, the transistor Q1 is conductive and the S.C.P. pin voltage is approximately 30 mV constantly.
If the load condition changes radically and output signal voltage of the error amplifier (FB) is 1.87 V or
higher, the short-circuit protection comparator outputs low-level voltage. Then, by cutting off the transistor Q1,
the external capacitor C
S
of S.C.P. pin (pin 5) starts charging with the current I
CHG
which is obtained from the
following formulas.
t
PE
[V]
C
S
t
PE
C
S
t
PE
[F]
0.72
I
CHG
is constant current which is determined by the timing resistor R
T
.
If R
T
is 15 k
, I
CHG
will be approximately 2.3
μ
A.
V
RT
×
[A]
R
T
11
When the external capacitor C
S
is charged up to approximately 0.75 V, the latch circuit will be turned on. Then
the totem-pole output pin will be set to low level and the dead-time will be set to 100%.
When the latch circuit is turned on, the S.C.P. pin will discharge electricity till the voltage on the S.C.P. pin
reduces to approximately 30 mV. The latch circuit cannot be, however, reset until power supply to the AN8014S
is turned off.
V
PE
=
V
STBY
+
I
CHG
×
0.75 V
=
0.03 V
+
I
CHG
×
C
S
=
I
CHG
×
I
CHG
=
1
Error amp.
Cut output off
6
7
8
Latch
Figure 3. Short-circuit protection circuit
S
Q
R
Q
S.C.P.
comp.
1.82 V
5
Q1
Q2
S.C.P.
I
CHG
C
S
V
REF
IN
IN
+
FB
5. Low input voltage malfunction prevention circuit (U.V.L.O.)
This circuit protects system from breakdown or deterioration caused by malfunction in control circuit when
supply voltage is dropped during transient time at power on or off.
The low input voltage malfunction prevention circuit detects internal reference voltage which changes in
accordance with the supply voltage level. When the supply voltage is turned on, it sets the dead-time of Out pin
(pin 13) to 100% and keeps the DTC pin (pin 4) and S.C.P. pin (pin 5) low level until the supply voltage reaches
3.1 V. When the supply voltage falls, it will operate even below 2.96 V because of its hysteresis width of 140 mV.
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| AN8014S-E1 | 功能描述:IC REG CTRLR BST INV PWM SO16 RoHS:否 類別: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 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 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)品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Single-channel step-down, step-up, or inverting use DC-DC converter control IC |
| AN8015SH-E1 | 功能描述:IC REG CTRLR BST INV PWM 10-SSOP RoHS:否 類別: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 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 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)品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8015SH-E1V | 功能描述:IC REG CTRLR BST INV PWM SSOP10 RoHS:是 類別: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 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 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)品目錄頁面:1316 (CN2011-ZH PDF) |
| AN8016 | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Single-channel 1.8-volt step-up DC-DC converter control IC |
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