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PDF MC34261 Data sheet ( Hoja de datos )
| Número de pieza | MC34261 | |
| Descripción | (MC33261 / MC34261) Power Factor Controllers | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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MC34261, MC33261
Power Factor Controllers
The MC34261/MC33261 are active power factor controllers
specifically designed for use as a preconverter in electronic ballast and
in off−line power converter applications. These integrated circuits
feature an internal startup timer, a one quadrant multiplier for near
unity power factor, zero current detector to ensure critical conduction
operation, high gain error amplifier, trimmed internal bandgap
reference, current sensing comparator, and a totem pole output ideally
suited for driving a power MOSFET.
Also included are protective features consisting of input
undervoltage lockout with hysteresis, cycle−by−cycle current limiting,
and a latch for single pulse metering. These devices are available in
dual−in−line and surface mount plastic packages.
• Internal Startup Timer
• One Quadrant Multiplier
• Zero Current Detector
• Trimmed 2% Internal Bandgap Reference
• Totem Pole Output
• Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
• Pinout Equivalent to the SG3561
• Functional Equivalent to the TDA4817
Simplified Block Diagram
http://onsemi.com
POWER FACTOR
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO−8)
Zero Current Detector
Zero Current
5 Detect Input
PIN CONNECTIONS
2.5V
Reference
Undervoltage
Lockout
Multiplier
Input 3
Gnd 6
Multiplier,
Latch,
PWM,
Timer,
&
Logic
Multiplier
Error Amp Vref
Compensation 2
VCC
8
Drive Output
7
Current Sense
4 Input
Voltage
Feedback
1 Input
Voltage Feedback
Input
1
Compensation 2
8 VCC
7 Drive Output
Multiplier Input 3
Current Sense
Input
4
6 Gnd
5
Zero Current
Detect Input
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC34261D
MC34261P
TA = 0° to +70°C
SO−8
Plastic DIP
MC33261D
MC33261P
TA = − 40° to +85°C
SO−8
Plastic DIP
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 3
1
Publication Order Number:
MC34261/D
1 page  
MC34261, MC33261
Figure 9. Zero Current Detector Input Threshold
Voltage Change versus Temperature
40
0
20
0
Upper Threshold
(Vin Increasing)
VCC = 12 V
−20
−40
−55
Lower Threshold
(Vin Decreasing)
−25 0
25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
−2.0
−4.0
−6.0
4.0
2.0
0
125 0
Figure 10. Output Saturation Voltage
versus Load Current
VCC
VCC = 12 V
80 μs Pulsed Load
120 Hz Rate
Source Saturation
(Load to Ground)
Sink Saturation
(Load to VCC)
Gnd
80 160 240
IO, OUTPUT LOAD CURRENT (mA)
320
Figure 11. Drive Output Waveform
VCC = 12 V
90 CL = 1.0 nF
% TA = 25°C
Figure 12. Drive Output Cross Conduction
VCC = 12 V
CL = 15 pF
TA = 25°C
10
%
100 ns/DIV
100 ns/DIV
Figure 13. Supply Current versus Supply Voltage
16
Figure 14. Undervoltage Lockout Thresholds
versus Temperature
12
11
12
Startup Threshold
(VCC Increasing)
10
8.0 9.0
4.0
VFB = 0 V
Current Sense = 0 V
Multiplier = 0 V
CL = 1.0 nF
8.0
7.0
Minimum Operating Threshold
(VCC Decreasing)
f = 50 kHz
TA = 25°C
0
0
10
20
30
40
6.0
−55
−25 0
25 50 75 100 125
VCC, SUPPLY VOLTAGE (V)
TA, AMBIENT TEMPERATURE (°C)
http://onsemi.com
5
5 Page 
MC34261, MC33261
Figure 20. Printed Circuit Board and Component Layout
(Circuits of Figures 15 and 16)
http://onsemi.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MC34261.PDF ] | |
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