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參數(shù)資料
| 型號： | UCC1809-2 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Economy Primary Side Controller |
| 中文描述： | 經(jīng)濟(jì)初級側(cè)控制器 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大小： | 131K |
| 代理商： | UCC1809-2 |
6
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
and 4.32k
, respectively. Using these
values maintains a ratio of at least 20:1 between the
R
DS(on)
of the internal FETs and the external timing re-
sistors, resulting in minimal change in frequency over
temperature. 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.
Figure 4. Oscillator frequency vs. C
T
(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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UCC2809 | Economy Primary Side Controller |
| UCC1809-x | Economy Primary Side Controller |
| UCC1810 | Dual Channel Synchronized Current Mode PWM |
| UCC1837 | RSO-S_D(Z) Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 1W; 2:1 and 4:1 Wide Input Voltage Ranges; 1kVDC, 2kVD & 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protectionwith Current Foldback; Low Noise; No External Capacitor needed; Efficiency to 83% |
| UCC1839 | RSO-S_D(Z) Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 05V; Power: 1W; 2:1 and 4:1 Wide Input Voltage Ranges; 1kVDC, 2kVD & 3kVDC Isolation; UL94V-0 Package Material; Continuous Short Circuit Protectionwith Current Foldback; Low Noise; No External Capacitor needed; Efficiency to 83% |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UCC1809J-1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Economy Primary Side Controller |
| UCC1809J-2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Economy Primary Side Controller |
| UCC1809-X | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Economy Primary Side Controller |
| UCC1810 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual Channel Synchronized Current Mode PWM |
| UCC1810J | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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