参数资料
型号: KA3842BD
厂商: Fairchild Semiconductor
文件页数: 4/10页
文件大小: 0K
描述: IC REG CTRLR PWM CM 14-SOP
标准包装: 4,860
PWM 型: 电流模式
输出数: 1
频率 - 最大: 500kHz
占空比: 100%
电源电压: 10 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 14-SOIC(0.154",3.90mm 宽)
包装: 管件
KA3842B/KA3843B/KA3844B/KA3845B
Electrical Characteristics (Continued)
(V CC =15V, R T =10K ? , C T =3.3nF, T A = 0 ° C to +70 ° C unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
PWM SECTION
Max. Duty Cycle
Min. Duty Cycle
D (Max)
D (MAX)
D (MIN)
KA3842B/KA3843B
KA3844B/KA3845B
-
95
47
-
97
48
-
100
50
0
%
%
%
TOTAL STANDBY CURRENT
Start-Up Current
Operating Supply Current
Zener Voltage
I ST
I CC(OPR)
V Z
-
V pin3 =V pin2 =ON
I CC = 25mA
-
-
30
0.45
14
38
1
17
-
mA
mA
V
Adjust V CC above the start threshould before setting at 15V
Note:
1. Parameter measured at trip point of latch
2. Gain defined as:
? V pin1
? V pin3
A = ------------------
,0 ≤ V pin3 ≤ 0.8V
3. These parameters, although guaranteed, are not 100 tested in production.
Figure 1. Open Loop Test Circuit
High peak currents associated with capacitive loads necessitate careful grounding techniques Timing and bypass capacitors
should be connected close to pin 5 in a single point ground. The transistor and 5K ? potentiometer are used to sample the
oscillator waveform and apply an adjustable ramp to pin 3.
4
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