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PDF CS3845 Data sheet ( Hoja de datos )
| Número de pieza | CS3845 | |
| Descripción | Current Mode PWM Control Circuit | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CS2844, CS3844, CS2845,
CS3845
Current Mode PWM
Control Circuit with
50% Max Duty Cycle
The CS3844/45 provides all the necessary features to implement
off–line fixed frequency current–mode control with a minimum
number of external components.
The CS3844 family incorporates a new precision
temperature–controlled oscillator to minimize variations in frequency.
An internal toggle flip–flop, which blanks the output every other clock
cycle, limits the duty–cycle range to less than 50%. An undervoltage
lockout ensures that VREF is stabilized before the output stage is
enabled. In the CS2844/CS3844 turn on occurs at 16 V and turn off at
10 V. In the CS2845/CS3845 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
• Temp. Compensated Oscillator
• 50% Max Duty–Cycle Clamp
• VREF Stabilized Before Output Stage Is 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
http://onsemi.com
MARKING
DIAGRAMS
8
8
1
8
1
14
1
16
1
DIP–8
N SUFFIX
CASE 626
SO–8
D SUFFIX
CASE 751
CSx84yN
AWL
YYWW
1
8
384yD
ALYW
SO–14
D SUFFIX
CASE 751A
1
14
CSx84yD14
AWLYWW
1
16
SO–16L
DW SUFFIX
CASE 751G
CSx84yDW
AWLYYWW
1
x = 2 or 3
y = 4 or 5
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 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2001
June, 2001 – Rev. 3
1
Publication Order Number:
CS2844/D
1 page  
CS2844, CS3844, CS2845, CS3845
ELECTRICAL CHARACTERISTICS (continued) (–25° ≤ TA ≤ 85° for CS2844/2845, 0° ≤ TA ≤ 70° for CS3844/CS3845.
VCC = 15 V*; RT = 10 kΩ, CT = 3.3 nF for sawtooth mode; unless otherwise stated.)
CS2844
CS3844
CS2845/CS3845
Characteristic
Test Conditions
Undervoltage Lockout Section
Start Threshold
–
Min Typ Max Min Typ Max Min Typ Max
15 16 17 14.5 16 17.5 7.8 8.4 9.0
Min. Operating Voltage After Turn On
9.0 10 11 8.5 10 11.5 7.0 7.6 8.2
*Adjust VCC above the start threshold before setting at 15 V.
Unit
V
V
PACKAGE PIN DESCRIPTION
Package Pin Number
DIP–8 & SO–8 SO–14
Symbol
1 13
2 34
3 55
4 76
5 9 11
– 8 10
6 10 12
– 11 13
7 12 14
8 14 15
– 2, 4, 6, 13 1, 2, 7, 8,
9, 16
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.
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
0.1 µF
VOUT
GND
A
1.0 kΩ
1.0 W
0.1 µF
VREF
VCC
VOUT
CT
Figure 2. Test Circuit Open Loop Laboratory Test Fixture
GND
http://onsemi.com
5
5 Page 
Notes
CS2844, CS3844, CS2845, CS3845
http://onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CS3845.PDF ] | |
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