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參數(shù)資料
| 型號： | CS51221EDR16 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Enhanced Voltage Mode PWM Controller |
| 中文描述： | 增強(qiáng)的電壓模式PWM控制器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 164K |
| 代理商： | CS51221EDR16 |
C
Application Information: continued
9
Figure 6: The Sync pin generates a sync pulse at the beginning of each
switching cycle. CH2: GATE Pin, CH3: R
T
C
T,
CH4: SYNC pin.
The bi-directional SYNC pin can also receive an external
sync signal of a greater frequency. As show in Fig.7, when
the SYNC pin is triggered by an incoming signal, the IC
immediately discharges C
T
. The GATE signal is turned on
once the R
T
C
T
pin reaches the valley voltage. Because of
the steep falling edge, this valley voltage falls below the
regular 1V threshold. However, the R
T
C
T
pin voltage is
then quickly raised by a clamp. When the R
T
C
T
pin reaches
the 0.95V(typ) Valley Clamp Voltage, the clamp is discon-
nected after a brief delay and C
T
is charged through R
T
.
Figure 7: Operation with external sync. CH 2: SYNC pin, CH3: Gate pin,
G4: R
T
C
T
pin.
Switch Frequency and Maximum Duty Cycle Calculations
Oscillator timing capacitor, C
T
, is charged by V
REF
through
R
T
and discharged by an internal current source. During
the discharge time, the internal clock signal sets the Gate
output to the low state, thus providing a user selectable
maximum duty cycle clamp. Charge and discharge times
are determined by following general formulas;
t
C
= R
T
C
T
ln
t
d
= R
T
C
T
ln
,
where
t
C
= charging time;
t
d
= discharging time;
V
VALLEY
= valley voltage of the oscillator;
V
PEAK
= peak voltage of the oscillator.
Substituting in typical values for the parameters in the
above formulas:
V
REF
= 3.3V, V
VALLEY
= 1V, V
PEAK
= 2V, I
d
= 1mA
t
C
= 0.57R
T
C
T
t
d
= R
T
C
T
ln
D
max
=
0.57
1.3- 0.001R
T
2.3- 0.001R
T
0.57+ In
It is noticed from the equation that for the oscillator to
function properly, R
T
has to be greater than 2.3k.
)
(
)
1.3- 0.001R
T
2.3- 0.001R
T
(
)
(V
REF
- V
PEAK
- I
d
R
T
)
(V
REF
- V
VALLEY
- I
d
R
T
)
(
)
(V
REF
- V
VALLEY
)
(V
REF
- V
PEAK
)
(
Design Guidelines
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CS51221EDR16G | 功能描述:電壓模式 PWM 控制器 Enhanced Current Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| CS51221EDTB16G | 功能描述:電壓模式 PWM 控制器 ANA PWM CTR TSSOP RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| CS51221EDTB16R2G | 功能描述:電壓模式 PWM 控制器 ANA PWM CTR TSSOP RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| CS51221EN16 | 制造商:CHERRY 制造商全稱:CHERRY 功能描述:Enhanced Voltage Mode PWM Controller |
| CS51227/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Enhanced Voltage Mode PWM Controller |
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