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參數(shù)資料
| 型號： | UC3845DX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | SOP-14 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 249K |
| 代理商： | UC3845DX |
UC3842/UC3843/UC3844/UC3845
4
Electrical Characteristics (Continued)
(VCC=15V, RT=10k
, CT=3.3nF, TA= 0°C to +70°C, unless otherwise specified)
Adjust VCC above the start threshould before setting at 15V
Note:
1. Parameter measured at trip point of latch
2. Gain defined as:
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)
UC3842/UC3843
95
97
100
%
D(Max)
UC3844/UC3845
47
48
50
%
Min. Duty Cycle
D(MIN)
-
--
0
%
TOTAL STANDBY CURRENT
Start-Up Current
IST
-
-0.45
1
mA
Operating Supply Current
ICC(OPR)
Vpin3=Vpin2=ON
-
14
17
mA
Zener Voltage
VZ
ICC = 25mA
30
38
-
V
A
V
pin1
V
pin3
------------------
=
UC3842
,0
≤ Vpin3 ≤ 0.8V
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