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參數資料
| 型號： | NCP1562A |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Performance Active Active Clamp/Reset PWM Controller Controller(高性能有效Clamp/Reset PWM控制器) |
| 中文描述： | 高性能主動有源鉗位/復位PWM控制器控制器（高性能有效鉗位/復位的PWM控制器） |
| 文件頁數： | 18/26頁 |
| 文件大小： | 277K |
| 代理商： | NCP1562A |
NCP1562A, NCP1562B
http://onsemi.com
18
Figure 40. Startup Circuit Waveforms
V
AUX(off1)
V
AUX(on)
V
AUX
V
inhibit
V
UVOV
V
REF
V
SS
V
out1
The startup regulator is disabled by biasing V
AUX
above
V
AUX(on)
. This feature allows the NCP1562 to operate from
an independent 12 V supply. If operating from an
independent supply, the V
in
and V
AUX
pins should be
connected together. The independent supply should
maintain V
AUX
above V
AUX(on)
. Otherwise, the Output
Latch will not be SET and the outputs will remain OFF after
a fault condition is removed.
The startup circuit sources current into the V
AUX
pin. It
is recommended to place a diode between C
AUX
and the
auxiliary supply as shown in Figure 41. This allows the
NCP1562 to charge C
AUX
while preventing the startup
regulator from sourcing current into the auxiliary supply.
Disable
V
in
I
start
V
AUX
I
AUX
C
AUX
I
supply
Auxiliary Supply or
Independent Supply
Figure 41. Recommended V
AUX
Configuration
C
AUX
provides power to the controller while operating
in the self-bias or DSS mode. During the converter
powerup, C
AUX
must be sized such that a V
AUX
voltage
greater than V
AUX(off2)
is maintained while the auxiliary
supply voltage is building up. Otherwise, V
AUX
will
collapse and the controller will turn OFF. Also, the V
AUX
discharge time (from 10.3 V to 7.0 V) must be greater that
the soft-start charge period to assure the converter turns
ON. The IC bias current, gate charge load on the outputs,
and the 5.0 V reference load must be considered to
correctly size C
AUX
. The current consumption due to
external gate charge is calculated using Equation 1.
IAUX(gatecharge)
f
QG
(eq. 1)
where, f is the operating frequency and Q
G
is the gate
charge.
An internal supervisory circuit monitors V
AUX
and
prevents excessive power dissipation if the V
AUX
pin is
accidentally shorted. While V
AUX
is below 1.2 V, the
startup circuit is disabled and a current source (I
inhibit
)
charges V
AUX
with a minimum current of 50 A. Once
V
AUX
reaches 1.2 V the startup circuit is enabled.
Therefore it is imperative that V
AUX
is not loaded (driver,
resistor divider, etc.) with more than 50 A while V
AUX
is
below 1.2 V. Otherwise, V
AUX
will not charge. If a load
greater than 50 A is present, a resistor can be placed
between the V
in
and V
AUX
pins to help charge V
AUX
to
1.2 V.
The startup circuit is rated at a maximum voltage of
100 V. If the device operates in the DSS mode, power
dissipation should be controlled to avoid exceeding the
maximum power dissipation of the controller. If dissipation
on the controller is excessive, a resistor can be placed in
series with the V
in
pin. This will reduce power dissipation
on the controller and transfer it to the series resistor.
Line Under/Overvoltage Detector
The same pin is used for both line undervoltage (UV) and
overvoltage (OV) detection using a novel architecture
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1562A WAF | 制造商:ON Semiconductor 功能描述: |
| NCP1562ADBR2G | 功能描述:電壓模式 PWM 控制器 HI PERF RESET PWM CONTLR RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| NCP1562ADR2G | 功能描述:電壓模式 PWM 控制器 HI PERF RESET PWM CONTLR RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| NCP1562BDBR2G | 功能描述:電壓模式 PWM 控制器 HI PERF RESET PWM CONTLR RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| NCP1562BDR2G | 功能描述:電壓模式 PWM 控制器 HI PERF RESET PWM CONTLR RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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