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CS3844GDW16 参数 Datasheet PDF下载

CS3844GDW16图片预览
型号: CS3844GDW16
PDF下载: 下载PDF文件 查看货源
内容描述: 电流模式PWM控制电路与50 %最大占空比 [Current Mode PWM Control Circuit with 50% Max Duty Cycle]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
文件页数/大小: 6 页 / 159 K
品牌: CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
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Electrical Characteristics: -25TA85˚C for CS2844/2845, 0TA70˚C for CS3844/3845. VCC=15V (Note 1); RT=10k,  
CT=3.3nF for sawtooth mode., unless otherwise stated.  
CS2844/CS2845  
CS3844/CS3845  
PARAMETER  
TEST CONDITIONS  
MIN TYP MAX MIN TYP MAX UNITS  
Total Standby Current  
Start-Up Current  
0.5  
11  
34  
1.0  
17  
0.5  
11  
34  
1.0 mA  
Operating Supply Current  
VCC Zener Voltage  
VFB=VSense=0V RT=10k, CT=3.3nF  
17  
mA  
V
ICC=25mA  
PWM Section  
Maximum Duty Cycle  
Minimum Duty Cycle  
46  
48  
50  
0
46  
48  
50  
0
%
%
CS2844  
CS3844  
CS2845/CS3845  
PARAMETER  
TEST CONDITIONS  
MIN  
TYP MAX MIN TYP MAX MIN TYP MAX UNITS  
Under-Voltage Lockout Section  
Start Threshold  
15  
9
16  
10  
17  
11  
14.5  
8.5  
16  
10  
17.5  
11.5  
7.8  
7.0  
8.4  
7.6  
9.0  
8.2  
V
V
Min. Operating After Turn On  
Voltage  
Notes:  
1. Adjust Vcc above the start threshold before setting at 15V.  
3. Parameter measured at trip point of latch with VFB=0.  
4. Gain defined as:  
2.These parameters, although guaranteed, are not 100% tested in production.  
VCOMP  
A =  
; 0 VSense 0.8V.  
VSense  
Package Pin Description  
PACKAGE PIN #  
14L  
PIN SYMBOL  
FUNCTION  
8L  
16L  
PDIP/SO SO Narrow SO Wide  
1
2
3
4
1
3
5
7
3
4
5
6
COMP  
VFB  
Error amp output, used to compensate error amplifier.  
Error amp inverting input.  
Sense  
OSC  
Noninverting input to Current Sense Comparator.  
Oscillator timing network with Capacitor to Ground, resis-  
tor to VREF  
.
5
6
9
8
11  
Gnd  
Pwr Gnd  
VOUT  
Ground.  
10  
Output driver Ground.  
Output drive pin.  
10  
12  
11  
13  
14  
V
CCPwr  
VCC  
Output driver positive supply.  
Positive power supply.  
Output of 5V internal reference.  
No Connection.  
7
8
12  
14  
15  
VREF  
NC  
2,4,6,13  
1,2,7,8,9,16  
3
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