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CS3845GDR14 Datasheet(PDF) 5 Page - ON Semiconductor

No. de Pieza. CS3845GDR14
Descripción  Current Mode PWM Control Circuit
Descarga  12 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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CS3845GDR14 Datasheet(HTML) 5 Page - ON Semiconductor

 
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CS2844, CS3844, CS2845, CS3845
http://onsemi.com
5
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
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Unit
Undervoltage Lockout Section
Start Threshold
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 & SO–8
SO–14
Symbol
Symbol
Description
1
1
3
COMP
Error amp output, used to compensate error amplifier.
2
3
4
VFB
Error amp inverting input.
3
5
5
Sense
Noninverting input to Current Sense Comparator.
4
7
6
OSC
Oscillator timing network with capacitor to ground, resistor to VREF.
5
9
11
GND
Ground.
8
10
Pwr GND
Output driver ground.
6
10
12
VOUT
Output drive pin.
11
13
VCC Pwr
Output driver positive supply.
7
12
14
VCC
Positive power supply.
8
14
15
VREF
Output of 5.0 V internal reference.
2, 4, 6, 13
1, 2, 7, 8,
9, 16
NC
No connection.
Figure 2. Test Circuit Open Loop Laboratory Test Fixture
VREF
VCC
VOUT
GND
COMP
VFB
Sense
OSC
0.1
µF
0.1
µF
RT
1.0 k
1.0 W
2N2222
100 k
VCC
VREF
VOUT
GND
A
5.0 k
Sense
ADJUST
CT
4.7 k
4.7 k
1.0 k
ERROR AMP
ADJUST


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