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PDF MC33261 Data sheet ( Hoja de datos )
| Número de pieza | MC33261 | |
| Descripción | POWER FACTOR CONTROLLERS | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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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
Order this document by MC34261/D
MC34261
MC33261
POWER FACTOR
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
Simplified Block Diagram
Zero Current Detector
2.5V
Reference
Undervoltage
Lockout
Zero Current
5 Detect Input
VCC
8
PIN CONNECTIONS
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)
Multiplier
Input 3
Gnd 6
Multiplier,
Latch,
PWM,
Timer,
&
Logic
Drive Output
7
Current Sense
4 Input
Multiplier
Error Amp Vref
Compensation 2
Voltage
Feedback
1 Input
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC34261D
MC34261P
TA = 0° to +70°C
SO–8
Plastic DIP
MC33261D
TA = – 40° to +85°C
MC33261P
SO–8
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1
1 page  
MC34261 MC33261
Figure 9. Zero Current Detector Input Threshold
Voltage Change versus Temperature
40
0
–2.0
20
VCC = 12 V
–4.0
0
Upper Threshold
(Vin Increasing)
–6.0
4.0
–20
Lower Threshold
(Vin Decreasing)
2.0
–40
–55
–25 0
25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
0
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
90
VCC = 12 V
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
12
8.0
VFB = 0 V
Current Sense = 0 V
4.0 Multiplier = 0 V
CL = 1.0 nF
f = 50 kHz
TA = 25°C
0
0 10 20 30 40
VCC, SUPPLY VOLTAGE (V)
Figure 14. Undervoltage Lockout Thresholds
versus Temperature
12
11
Startup Threshold
(VCC Increasing)
10
9.0
8.0
Minimum Operating Threshold
(VCC Decreasing)
7.0
6.0
–55
–25 0
25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page 
MC34261 MC33261
Figure 20. Printed Circuit Board and Component Layout
(Circuits of Figures 15 and 16)
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MC33261.PDF ] | |
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