參數(shù)資料
型號(hào): KA3845BD
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: SMPS Controller
中文描述: 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
封裝: SOP-14
文件頁(yè)數(shù): 4/12頁(yè)
文件大小: 91K
代理商: KA3845BD
KA3842B/KA3843B/KA3844B/KA3845B
4
Electrical Characteristics (Continued)
(V
CC
=15V, R
T
=10K
, C
T
=3.3nF, T
A
= 0
°
C to +70
°
C unless otherwise specified)
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
1
V
3
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.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
PWM SECTION
Max. Duty Cycle
D
(max)
D
D
(MIN)
KA3842B/KA3843B
KA3844B/KA3845B
95
47
-
97
48
-
100
50
0
%
%
%
Min. Duty Cycle
TOTAL STANDBY CURRENT
Start-Up Current
Operating Supply Current
Zener Voltage
-
I
ST
-
-
-
0.45
14
38
1
17
-
mA
mA
V
I
CC(OPR)
V
Z
V
3
=V
2
=ON
I
CC
= 25mA
30
A
----------
=
,0
V3
0.8V
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