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UCC1809J-1 Datasheet(PDF) 6 Page - Texas Instruments

Part # UCC1809J-1
Description  Economy Primary Side Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC1809J-1 Datasheet(HTML) 6 Page - Texas Instruments

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UCC1809-1/-2
UCC2809-1/-2
UCC3809-1/-2
The recommended value for CT is 1nF for frequencies in
the 100 kHz or less range and smaller CT for higher fre-
quencies. The minimum recommended values of RT1
and RT2 are 10k
Ω and 4.32kΩ, respectively. Using these
values maintains a ratio of at least 20:1 between the
RDS(on) of the internal FETs and the external timing resis-
tors, resulting in minimal change in frequency over tem-
perature. Because of the oscillator's susceptibility to
capacitive coupling, examine the oscillator frequency by
looking at the common RT1-RT2-CT node on the circuit
board as opposed to looking at pins 3 and 4 directly. For
good noise immunity, RT1 and RT2 should be placed as
close to pins 3 and 4 of the IC as possible. CT should be
returned directly to the ground pin of the IC with minimal
stray inductance and capacitance.
10
100
1000
100
1000
10000
CT [pF]
Figure 4. Oscillator frequency vs. CT (RT1 = 10k,
RT2 = 4.32k)
CT
S(OSC)
R(OSC)
Q(OSC)=CLK
=S(PWM)
FB
R(PWM)
Q(PWM)
OUT
CT
CHARGING
CT
DISCHARGING
3.33V
1.67V
1V
70%
ON
30%
OFF
FB SIGNAL DOMINANT
MAX. DUTY CYCLE DOMINANT
Figure 3. Waveforms associated with the oscillator latch and the PWM latch.
APPLICATION INFORMATION (cont.)
UDG-99037


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