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參數(shù)資料
| 型號： | CS2843ALN8 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 273K |
| 代理商： | CS2843ALN8 |
CS2842A, CS3842A, CS2843A, CS3843A
http://onsemi.com
5
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.)
Characteristic
Test Conditions
CS2842A
CS3842A
CS2843A/CS3843A
Unit
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
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
Symbol
Description
DIP8
SO8
SO14
1
1
1
COMP
Error amp output, used to compensate error amplifier.
2
2
3
VFB
Error amp inverting input.
3
3
5
Sense
Noninverting input to Current Sense Comparator.
4
4
7
OSC
Oscillator timing network with capacitor to ground, resistor to VREF.
5
5
8
GND
Ground.
9
Pwr GND
Output driver ground.
6
6
10
VOUT
Output drive pin.
11
VCC Pwr
Output driver positive supply.
7
7
12
VCC
Positive power supply.
8
8
14
VREF
Output of 5.0 V internal reference.
2, 4, 6, 13
NC
No connection.
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 2. Oscillator Frequency vs. CT
Figure 3. Oscillator Duty Cycle vs. RT
900
800
700
600
500
Frequency
(kHz)
.0005
.001
.002
.04 .05
CT (μF)
400
300
200
100
.03
.02
.01
.003 .005
RT = 680 Ω
RT = 1.5 kΩ
RT = 10 kΩ
100
90
80
70
50
Duty
Cycle
(%)
RT (Ω)
40
30
20
10
60
100
200
300
400 500
700
1k
2k
3k
4k 5k
7k
10
k
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