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參數(shù)資料
| 型號： | MC33260DR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 372K |
| 描述： | IC PFC CONTROLLER DCM 8SOIC |
| 產(chǎn)品變化通告： | Reactivation Notice 08/Apr/2011 Product Discontinuation 27/Jan/2012 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | GreenLine™ |
| 模式： | 間歇導(dǎo)電（DCM） |
| 電流 - 啟動： | 100µA |
| 電源電壓： | 11 V ~ 16 V |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 剪切帶 (CT) |
| 其它名稱： | MC33260DR2GOSCT |
MC33260
http://onsemi.com
13
Pin Numbers are Relevant to the PDIP- -8 Version
In particular, a 11 V Zener diode is internally connected
between the terminal and ground on the following pins:
Feedback, V
control
, Oscillator, Current Sense, and
Synchronization.
Figure 31. Synchronization Arrangement
S2
R2
Q2
S1
R2
Q1
&
2 ms
R
sync
--
+
Sync
5
1 V
UVLO
1 V
Output_Ctrl
PWM
Set
Q1 High <=>
Synchronization Mode
SYNCHRONIZATION BLOCK
The MC33260 features two modes of operation:
?nbsp FreeRunningDiscontinuousMode:Thepowerswitch
is turned on as soon as there is no current left in the
inductor (Zero Current Detection). This mode is
simply obtained by grounding the synchronization
terminal (Pin 5).
?nbsp Synchronization Mode: This mode is set as soon as a
signal crossing the 1.0 V threshold, is applied to the
Pin 5. In this case, operation in free running can only
be recovered after a new circuit startup. In this mode,
the power switch cannot turn on before the two
following conditions are fulfilled.
- - Still, the zero current must have been detected.
- - The precedent turn on must have been followed by (at
least) one synchronization raising edge crossing the
1.0 V threshold.
In other words, the synchronization acts to prolong the
power switch off time.
Consequently, a proper synchronized operation requires
thatthecurrentcycle(on- -time+inductordemagnetization)
is shorter than the synchronization period. Practically, the
inductormustbechosenaccordingly.Otherwise,thesystem
will keep working in free running discontinuous mode.
Figure 36 illustrates this behavior.
It must be noticed that whatever the mode is, a 2.0 ms
minimumoff- -timeisforced.Thisdelaylimitstheswitching
frequency in light load conditions.
OUTPUT SECTION
The output stage contains a totem pole optimized to
minimize the cross conduction current during high speed
operation.Thegatedriveiskeptinasinkingmodewhenever
the Undervoltage Lockout is active. The rise and fall times
have been controlled to typically equal 50 ns while loaded
by 1.0 nF.
REFERENCE SECTION
Aninternalreferencecurrentsource(I
ref
)istrimmedtobe
?% accurate over the temperature range (the typical value
is 200 mA). I
ref
is the reference used for the regulation
(I
regH
= I
ref
).
UNDERVOLTAGE LOCKOUT SECTION
An Undervoltage Lockout comparator has been
implemented to guarantee that the integrated circuit is
operatingonlyif itssupplyvoltage(V
CC
) ishigh enoughto
enable a proper working. The UVLO comparator monitors
the Pin 8 voltage and when it exceeds 11 V, the device gets
active. To prevent erratic operation as the threshold is
crossed, 2.5 V of hysteresis is provided.
Thecircuitoffstateconsumptionisverylow:intherange
of 100 mA @ V
CC
= 5.0 V. This consumption varies versus
V
CC
as the circuit presents a resistive load in this mode.
THERMAL SHUTDOWN
An internal thermal circuitry is provided to disable the
circuit gate drive and then to prevent it from oscillating, if
the junction temperature exceeds 150癈 typically.
The output stage is again enabled when the temperature
drops below 120癈 typically (30癈 hysteresis).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC33260P | 功能描述:功率因數(shù)校正 IC Critical Conduction RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC33260PG | 功能描述:功率因數(shù)校正 IC Critical Conduction Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| MC33261 | 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 16.7/W 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 16.7C/W 制造商:SPC Multicomp 功能描述:HEAT SINK; Packages Cooled:TO-218 / TO-220; Thermal Resistance:16.7C/W; External Height - Imperial:1"; External Height - Metric:25.4mm; External Width - Imperial:0.654"; External Width - Metric:16.6mm; Heat Sink Material:Aluminium ;RoHS Compliant: Yes |
| MC33261P | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC33262 | 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 12.9/W 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 12.9C/W 制造商:SPC Multicomp 功能描述:HEAT SINK; Packages Cooled:TO-218 / TO-220; Thermal Resistance:12.9C/W; External Height - Imperial:1.5"; External Height - Metric:38.1mm; External Width - Imperial:0.654"; External Width - Metric:16.6mm; Heat Sink Material:Aluminium;RoHS Compliant: Yes |
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