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參數(shù)資料
| 型號： | UCCX809-1 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Economy Primary Side Controller |
| 中文描述： | 經(jīng)濟初級側控制器 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 168K |
| 代理商： | UCCX809-1 |
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 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
CT [pF]
10000
F
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
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UCCX809-2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Economy Primary Side Controller |
| UC-D | 制造商:Banner Engineering 功能描述:Cover, Flat Vinyle, Models, SBD1, SBED1, SBEXD1, SBRXD1, & 2SBD1 |
| UCD0J101MCL1GS | 功能描述:鋁質電解電容器-SMD 6.3volts 100uF 105C RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
| UCD0J101MCL6GS | 功能描述:鋁質電解電容器-SMD 6.3volts 100uF 105C RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
| UCD0J102MNL1GS | 功能描述:鋁質電解電容器-SMD 6.3volts 1000uF 105c RoHS:否 制造商:Vishay/BC Components 電容:2200 uF 容差:20 % 電壓額定值:16 V ESR: 工作溫度范圍:- 55 C to + 150 C 尺寸:16 mm W x 16 mm L x 21 mm H 產(chǎn)品:High Temp Electrolytic Capacitors |
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