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UC3842 Datasheet(PDF) 4 Page - Fairchild Semiconductor

Part No. UC3842
Description  SMPS Controller
Download  12 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

UC3842 Datasheet(HTML) 4 Page - Fairchild Semiconductor

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UC3842/UC3843/UC3844/UC3845
4
Electrical Characteristics (Continued)
(VCC=15V, RT=10k
Ω, 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
Ω 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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