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PDF CS3843A Data sheet ( Hoja de datos )
| Número de pieza | CS3843A | |
| Descripción | (CS3842A / CS3843A) Off-Line Current Mode PWM Control Circuit | |
| Fabricantes | ON Semiconductor | |
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CS2842A, CS3842A,
CS2843A, CS3843A
Off−Line Current Mode
PWM Control Circuit with
Undervoltage Lockout
The CS284XA, CS384XA provides all the necessary features to
implement off−line fixed frequency current−mode control with a
minimum number of external components.
The CS384XA family incorporates a new precision
temperature−controlled oscillator with an internally trimmed
discharge current to minimize variations in frequency. A precision
duty−cycle clamp eliminates the need for an external oscillator when a
50% duty−cycle is used. 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.
Other features include low startup current, pulse−by−pulse current
limiting, and a high−current totem pole output for driving capacitive
loads, such as the gate of power MOSFET. The output is LOW in the
off state, consistent with N−channel devices.
The CS384XA series of current−mode control ICs are available in
8 and14 lead packages for surface mount (SO) applications as well as
8 lead PDIP packages.
Features
• Optimized for Off−line Control
• Internally Trimmed Temperature Compensated Oscillator
• Maximum Duty−Cycle Clamp
• VREF Stabilized Before Output Stage is Enabled
• Low Startup Current
• Pulse−By−Pulse Current Limiting
• Improved Undervoltage Lockout
• Double Pulse Suppression
• 1.0% Trimmed Bandgap Reference
• High Current Totem Pole Output
http://onsemi.com
MARKING
DIAGRAM
8
8
1
8
1
DIP−8
N SUFFIX
CASE 626
SO−8
D SUFFIX
CASE 751
x84yA
AWL
YYWW
1
8
x84yA
ALYWX
14
1
SO−14
D SUFFIX
CASE 751A
1
14
CSx84yA
AWLYWW
1
x = 2 or 3
y = 2 or 3
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
CS2842A/D
1 page  
CS2842A, CS3842A, CS2843A, CS3843A
ELECTRICAL CHARACTERISTICS (continued) (−25° ≤ TA ≤ 85° for CS2842A/CS2843A, 0° ≤ TA ≤ 70° for CS3842A/CS3843A.
VCC = 15 V*; RT = 680 Ω, CT = 0.022 μF for triangular mode, RT = 10 kΩ, CT = 3.3 nF for sawtooth mode (see Figure 7);
unless otherwise stated.)
CS2842A
CS3842A
CS2843A/CS3843A
Characteristic
Test Conditions
Undervoltage Lockout Section
Start Threshold
−
Min Typ Max Min Typ Max Min Typ Max Unit
15 16 17 14.5 16 17.5 7.8 8.4 9.0 V
Min. Operating Voltage After Turn On
9.0 10
11 8.5 10 11.5 7.0 7.6 8.2
V
*Adjust VCC above the start threshold before setting at 15 V.
PACKAGE PIN DESCRIPTION
Package Pin Number
DIP−8
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ2
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ3
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ4
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ5
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ−
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ6
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ−
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ7
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ8
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ−
SO−8
1
2
3
4
5
−
6
−
7
8
−
SO−14
1
3
5
7
8
9
10
11
12
14
2, 4, 6, 13
Symbol
COMP
VFB
Sense
OSC
GND
Pwr GND
VOUT
VCC Pwr
VCC
VREF
NC
Description
Error amp output, used to compensate error amplifier.
Error amp inverting input.
Noninverting input to Current Sense Comparator.
Oscillator timing network with capacitor to ground, resistor to VREF.
Ground.
Output driver ground.
Output drive pin.
Output driver positive supply.
Positive power supply.
Output of 5.0 V internal reference.
No connection.
TYPICAL PERFORMANCE CHARACTERISTICS
900
800
700
RT = 680 Ω
600
500 RT = 1.5 kΩ
400
300
200 RT = 10 kΩ
100
.0005
.001 .002 .003 .005 .01
CT (μF)
.02 .03 .04 .05
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
http://onsemi.com
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet CS3843A.PDF ] | |
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