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PDF CS52843 Data sheet ( Hoja de datos )
| Número de pieza | CS52843 | |
| Descripción | Current Mode PWM Control Circuit | |
| Fabricantes | ON Semiconductor | |
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CS52843
Current Mode
PWM Control Circuit
The CS52843 provides all the necessary features to implement
off−line fixed frequency current−mode control with a minimum
number of external components.
The CS52843 incorporates a new precision temperature−controlled
oscillator to minimize variations in frequency. An undervoltage
lockout ensures that VREF is stabilized before the output stage is
enabled. In the CS52843 turn on is at 8.4 V and turn off at 7.6 V.
Other features include low start−up current, pulse−by−pulse current
limiting, and a high−current totem pole output for driving capacitive
loads, such as gate of a power MOSFET. The output is low in the off
state, consistent with N−channel devices.
Features
• Optimized for Off−Line Control
• Internally Temperature Compensated Oscillator
• VREF Stabilized before Output Stage is Enabled
• Very Low Start−Up Current 300 μA (typ)
• Pulse−by−Pulse Current Limiting
• Improved Undervoltage Lockout
• Double Pulse Suppression
• 2.0% 5.0 Volt Reference
• High Current Totem Pole Output
http://onsemi.com
8
1
SO−8
D SUFFIX
CASE 751
14
1
SO−14
D SUFFIX
CASE 751A
PIN CONNECTIONS AND
MARKING DIAGRAMS
COMP 1
VFB
Sense
OSC
VREF
VCC
VOUT
GND
1
COMP
NC
VFB
NC
Sense
NC
OSC
14
VREF
NC
VCC
VCC Pwr
VOUT
Pwr GND
GND
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
ORDERING INFORMATION
Device
Package
Shipping
CS52843ED8
CS52843EDR8
CS52843ED14
CS52843EDR14
SO−8
SO−8
SO−14
SO−14
95 Units/Rail
2500 Tape & Reel
55 Units/Rail
2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
CS52843/D
1 page  
CS52843
TYPICAL PERFORMANCE CHARACTERISTICS
900
800
700 RT = 680 Ω
600
500
400 RT = 1.5 kΩ
300
200 RT = 10 kΩ
100
.0005
.001 .002
.003 .005 .01 .02 .03 .04 .05
CT (μF)
Figure 2. Oscillator Frequency vs CT
100
90
80
70
60
50
40
30
20
10
RT (Ω)
Figure 3. Oscillator Duty Cycle vs RT
4.7 kΩ
1.0 kΩ
Error Amp
Adjust
4.7 kΩ
2N2222
100 kΩ
5.0 kΩ
Sense
Adjust
RT
COMP
VFB
Sense
OSC
VREF
VCC
VOUT
A
0.1 μF
0.1 μF
1.0 kΩ
1.0 W
GND
VREF
VCC
VOUT
CT
Figure 4. Test Circuit Open Loop Laboratory Test Fixture
GND
CIRCUIT DESCRIPTION
http://onsemi.com
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet CS52843.PDF ] | |
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