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參數(shù)資料
| 型號： | NCP1207APG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PWM Current−Mode Controller for Free Running Quasi−Resonant Operation |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大小： | 334K |
| 代理商： | NCP1207APG |
NCP1207A
http://onsemi.com
8
APPLICATION INFORMATION
Introduction
The NCP1207A implements a standard current mode
architecture where the switch
off time is dictated by the
peak current setpoint whereas the core reset detection
triggers the turn
on event. This component represents the
ideal candidate where low part
count is the key parameter,
particularly in low
cost AC/DC adapters, consumer
electronics, auxiliary supplies, etc. Thanks to its
high
performance
High
Voltage
NCP1207A incorporates all the necessary components /
features needed to build a rugged and reliable Switch
Mode
Power Supply (SMPS):
Transformer core reset detection:
borderline / critical
operation is ensured whatever the operating conditions
are. As a result, there are virtually no primary switch
turn
on losses and no secondary diode recovery losses.
The converter also stays a first
order system and
accordingly eases the feedback loop design.
Quasi
resonant operation:
by delaying the turn
on
event, it is possible to re
start the MOSFET in the
minimum of the drain
source wave, ensuring reduced
EMI / video noise perturbations. In nominal power
conditions, the NCP1207A operates in Borderline
Conduction Mode (BCM) also called Critical
Conduction Mode.
Dynamic Self
Supply (DSS):
due to its Very High
Voltage Integrated Circuit (VHVIC) technology,
ON Semiconductor’s NCP1207A allows for a direct pin
connection to the high
voltage DC rail. A dynamic
current source charges up a capacitor and thus provides
a fully independent V
CC
level to the NCP1207A. As a
result, there is no need for an auxiliary winding whose
management is always a problem in variable output
voltage designs (e.g. battery chargers).
Overvoltage Protection (OVP):
by sampling the plateau
voltage on the demagnetization winding, the
NCP1207A goes into latched fault condition whenever
an over
voltage condition is detected. The controller
stays fully latched in this position until the V
CC
is
cycled down 4.0 V, e.g. when the user un
plugs the
power supply from the mains outlet and re
plugs it.
External latch trip point:
by externally forcing a level
on the OVP greater than the internal setpoint, it is
possible to latchoff the IC, e.g. with a signal coming
from a temperature sensor.
Adjustable skip cycle level:
by offering the ability to
tailor the level at which the skip cycle takes place, the
designer can make sure that the skip operation only
technology,
the
occurs at low peak current. This point guarantees a
noise
free operation with cheap transformer. This
option also offers the ability to fix the maximum
switching frequency when entering light load
conditions.
Overcurrent Protection (OCP):
by continuously
monitoring the FB line activity, NCP1207A enters burst
mode as soon as the power supply undergoes an
overload. The device enters a safe low power operation
which prevents from any lethal thermal runaway. As
soon as the default disappears, the power supply
resumes operation. Unlike other controllers, overload
detection is performed independently of any auxiliary
winding level. In presence of a bad coupling between
both power and auxiliary windings, the short circuit
detection can be severely affected. The DSS naturally
shields you against these troubles.
Dynamic Self
Supply
The DSS principle is based on the charge/discharge of the
V
CC
bulk capacitor from a low level up to a higher level. We
can easily describe the current source operation with some
simple logical equations:
POWER
ON: IF V
CC
< VCC
OFF
THEN Current Source
is ON, no output pulses
IF V
CC
decreasing > VCC
ON
THEN Current Source is
OFF, output is pulsing
IF V
CC
increasing < VCC
OFF
THEN Current Source is
ON, output is pulsing
Typical values are: VCC
OFF
= 12 V, VCC
ON
= 10 V
To better understand the operational principle, Figure 12’s
sketch offers the necessary light.
Figure 12. The Charge/Discharge Cycle Over a 10 F
V
CC
Capacitor
V
C
C
S
V
RIPPLE
= 2 V
ON
OFF
VCC
OFF
= 12 V
VCC
ON
= 10 V
Output Pulses
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1207B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Free Running Quasi-Resonant Operation |
| NCP1207BDR2G | 功能描述:電流型 PWM 控制器 ANA QUASI RESNT SMPS RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1207-D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Free Running Quasi-Resonant Operation |
| NCP1207DR2 | 功能描述:IC CTRLR PWM CM OVP OCP HV 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:- 標準包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
| NCP1207DR2G | 功能描述:IC CTRLR PWM CM OVP OCP HV 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開關(guān) 系列:- 標準包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱:FSL206MRBNFSDKR |
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