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PDF CS2841B Data sheet ( Hoja de datos )
| Número de pieza | CS2841B | |
| Descripción | Automotive Current Mode PWM Control Circuit | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CS2841B
Automotive Current Mode
PWM Control Circuit
The CS2841B provides all the necessary features to implement
off−line fixed frequency current−mode control with a minimum
number of external components.
The CS2841B (a variation of the CS2843A) is designed specifically
for use in automotive operation. The low start threshold voltage of 8.0 V
(typ), and the ability to survive 40 V automotive load dump transients
are important for automotive subsystem designs. The CS2841 series
has a history of quality and reliability in automotive applications.
The CS2841B incorporates a precision temperature−controlled
oscillator with an internally trimmed discharge current to minimize
variations in frequency. Duty−cycles greater than 50% are also
possible. On board logic ensures that VREF is stabilized before the
output stage is enabled. Ion implant resistors provide tighter control of
undervoltage lockout.
Features
• Optimized for Off−Line Control
• Internally Trimmed Temperature Compensated Oscillator
• Maximum Duty−Cycle Clamp
• VREF Stabilized Before Output Stage Enabled
• Low Start−Up Current
• Pulse−By−Pulse Current Limiting
• Improved Undervoltage Lockout
• Double Pulse Suppression
• 1.0 % Trimmed Bandgap Reference
• High Current Totem Pole Output
• Pb−Free Packages are Available*
http://onsemi.com
8
1
14
1
PDIP−8
N SUFFIX
CASE 626
SOIC−14
D SUFFIX
CASE 751A
PIN CONNECTIONS AND
MARKING DIAGRAM
COMP
VFB
Sense
OSC
PDIP−8
VREF
VCC
VOUT
GND
COMP
NC
VFB
NC
Sense
NC
OSC
SOIC−14
VREF
NC
VCC
VCC PWR
VOUT
PWR GND
GND
CS2841B = Device Code
A = Assembly Location
WL = Wafer Lot
YY, Y
= Year
WW = Work Week
G = Pb−Free Package
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
September, 2005 − Rev. 7
1
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
Publication Order Number:
CS2841B/D
1 page  
CS2841B
TYPICAL PERFORMANCE CHARACTERISTICS
900
800
RT = 680 W
700
600
500 RT = 1.5 kW
400
300
200 RT = 10 kW
100
.0005
.001 .002 .003 .005 .01
CT (mF)
.02 .03 .04 .05
Figure 2. Oscillator Frequency vs. CT
100
90
80
70
60
50
40
30
20
10
RT (W)
Figure 3. Oscillator Duty Cycle vs. RT
4.7 kW
1.0 kW
Error Amp
Adjust
4.7 kW
2N2222
100 kW
5.0 kW
Sense
Adjust
RT
COMP
VREF
VFB VCC
CS2841B
Sense
VOUT
OSC
GND
A
0.1 mF
0.1 mF
1.0 kW
1.0 W
CT
Figure 4. Test Circuit
VREF
VCC
VOUT
GND
http://onsemi.com
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet CS2841B.PDF ] | |
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