|
|
PDF MC33260 Data sheet ( Hoja de datos )
| Número de pieza | MC33260 | |
| Descripción | GreenLine Compact Power Factor Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MC33260 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
MC33260
Product Preview
GPoreweenrLFinaec™toCr oCmonptarcotller:
Innovative Circuit for
Cost Effective Solutions
The MC33260 is a controller for Power Factor Correction
preconverters meeting international standard requirements in
electronic ballast and off–line power conversion applications.
Designed to drive a free frequency discontinuous mode, it can also be
synchronized and in any case, it features very effective protections that
ensure a safe and reliable operation.
This circuit is also optimized to offer extremely compact and cost
effective PFC solutions. While it requires a minimum number of
external components, the MC33260 can control the follower boost
operation that is an innovative mode allowing a drastic size reduction
of both the inductor and the power switch. Ultimately, the solution
system cost is significantly lowered.
Also able to function in a traditional way (constant output voltage
regulation level), any intermediary solutions can be easily
implemented. This flexibility makes it ideal to optimally cope with a
wide range of applications.
General Features
• Standard Constant Output Voltage or “Follower Boost” Mode
• Switch Mode Operation: Voltage Mode
• Latching PWM for Cycle–by–Cycle On–Time Control
• Constant On–Time Operation That Saves the Use of an Extra Multiplier
• Totem Pole Output Gate Drive
• Undervoltage Lockout with Hysteresis
• Low Start–Up and Operating Current
• Improved Regulation Block Dynamic Behavior
• Synchronization Capability
• Internally Trimmed Reference Current Source
Safety Features
• Overvoltage Protection: Output Overvoltage Detection
• Undervoltage Protection: Protection Against Open Loop
• Effective Zero Current Detection
• Accurate and Adjustable Maximum On–Time Limitation
• Overcurrent Protection
• ESD Protection on Each Pin
D1...D4
Filtering
Capacitor
Vcontrol
Rcs ROCP
TYPICAL APPLICATION
L1 D1
1
2
3
4
CT
8 VCC
7
6
5
Sync
M1
+ C1
LOAD
(SMPS, Lamp
Ballast,...)
Ro
http://onsemi.com
8
1
DIP–8
P SUFFIX
CASE 626
PIN CONNECTIONS AND
MARKING DIAGRAM
Feedback Input 1
8 VCC
Vcontrol
Oscillator
Capacitor (CT)
Current Sense
Input
2
3
4
7 Gate Drive
6 Gnd
5
Synchronization
Input
AWL = Manufacturing Code
YYWW = Date Code
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
MC33260P
Plastic DIP–8 50 Units / Rail
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 1999
November, 1999 – Rev. 1
1
Publication Order Number:
MC33260/D
1 page  
MC33260
1.6
1.4
1.2
1.0
0.8
0.6 – 40°C
0.4 25°C
0.2 105°C
0
0 20 40 60 80 100 120 140 160 180 200 220 240
Ipin1: FEEDBACK CURRENT (µA)
Figure 1. Regulation Block Output versus
Feedback Current
1.6
1.4 – 40°C
25°C
1.2
105°C
1.0
0.8
0.6
0.4
0.2
0
185
190 195 200 205
Ipin1: FEEDBACK CURRENT (µA)
210
Figure 2. Regulation Block Output versus
Feedback Current
1.340
1.335
1.330
1.325
1.320
1.315
1.310
1.305
1.300
–40
–20
0 20 40 60 80
JUNCTION TEMPERATURE (°C)
100
Figure 3. Maximum Oscillator Swing versus
Temperature
3.5
3.0
2.5
2.0
1.5
1.0 – 40°C
25°C
0.5 105°C
0
0 20 40 60 80 100 120 140 160 180 200 220 240
Ipin1: FEEDBACK CURRENT (µA)
Figure 4. Feedback Input Voltage versus
Feedback Current
500
450
400
350
300
250
200
150
100
50
0
0
20 40
– 40°C
25°C
105°C
60 80 100 120 140 160 180 200 220 240
Ipin1: FEEDBACK CURRENT (µA)
Figure 5. Oscillator Charge Current versus
Feedback Current
410
Ipin1 = 200 mA
405
400
395
390
385
–40 –20
0 20 40 60
JUNCTION TEMPERATURE (°C)
80
100
Figure 6. Oscillator Charge Current versus
Temperature
http://onsemi.com
5
5 Page 
MC33260
ǂ ǃ +ton max
Cpin3
Kosc
R2o
V2o
This equation shows that the maximum on–time is
inversely proportional to the squared output voltage. This
property is used for follower boost operation (refer to
Follower Boost section).
CURRENT SENSE BLOCK
The inductor current is converted into a voltage by
inserting a ground referenced resistor (Rcs) in series with the
input diodes bridge (and the input filtering capacitor).
Therefore a negative voltage proportional to the inductor
current is built:
+ * ǂ ǃVcs
Rcs IL
where:
IL is the inductor current,
Rcs is the current sense resistor,
Vcs is the measured Rcs voltage.
Zero Current Detection
The Zero Current Detection function guarantees that the
MOSFET cannot turn on as long as the inductor current
hasn’t reached zero (discontinuous mode).
The pin 4 voltage is simply compared to the (–60 mV)
threshold so that as long as Vcs is lower than this threshold,
the circuit gate drive signal is kept in low state.
Consequently, no power MOSFET turn on is possible until
the inductor current is measured as smaller than (60 mV/Rcs)
that is, the inductor current nearly equals zero.
D1...D4
1
ROCP
4
Rcs VOCP
Iocp (205 mA)
Output_Ctrl
–60 mV
0
+
–
LEB
S
PWM
Latch
R
Output_Ctrl
Q
R
To Output Buffer
(Output_Ctrl Low <=> Gate Drive in Low State)
Figure 25. Current Sense Block
Time
VOCP
–60 mV
Zero Current Detection
VOCP = ROCP IOCP
An overcurrent is detected if Vpin4 crosses the threshold (–60 mV)
during the Power Switch on state
Figure 24. Current Sensing
The negative signal Vcs is applied to the current sense
through a resistor ROCP. The pin is internally protected by a
negative clamp (–0.7 V) that prevents substrate injection.
As long as the pin 4 voltage is lower than (–60 mV), the
Current Sense comparator resets the PWM latch to force the
gate drive signal low state. In that condition, the power
MOSFET cannot be on.
During the on–time, the pin 4 information is used for the
overcurrent limitation while it serves the zero current
detection during the off time.
Overcurrent Protection
During the power switch conduction (i.e. when the Gate
Drive pin voltage is high), a current source is applied to the
pin 4. A voltage drop VOCP is then generated across the
resistor ROCP that is connected between the sense resistor
and the Current Sense pin (refer to Figure 25). So, instead of
Vcs, the sum (Vcs + VOCP) is compared to (–60 mV) and the
maximum permissible current is the solution of the
* ǂ ǃ ) + *following equation:
Rcs Ipkmax
VOCP
60 mV
where:
Ipkmax is maximum allowed current,
Rcs is the sensing resistor.
+ ǂ ǃ )The overcurrent threshold is then:
Ipkmax
ROCP IOCP
Rcs
60
where:
*10 3
ROCP is the resistor connected between the pin and the
sensing resistor (Rcs),
IOCP is the current supplied by the Current Sense pin
when the gate drive signal is high (power switch
conduction phase). IOCP equals 205 µA typically.
Practically, the VOCP offset is high compared to 60 mV
and the precedent equation can be simplified. The maximum
current is then given by the following equation:
[Ipkmax
RORCcsP<<Wk>W>
0.205 <A>
Consequently, the ROCP resistor can program the OCP
level whatever the Rcs value is. This gives a high freedom in
the choice of Rcs. In particular, the inrush resistor can be
utilized.
http://onsemi.com
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MC33260.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MC33260 | GreenLine Compact Power Factor Controller | ON Semiconductor |
| MC33261 | POWER FACTOR CONTROLLERS |  Motorola Semiconductors |
| MC33261 | (MC33261 / MC34261) POWER FACTOR CONTROLLERS | Motorola Semiconductors |
| MC33261 | (MC33261 / MC34261) Power Factor Controllers | ON Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |