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參數資料
| 型號： | UCC35705DGKTR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH - SPEED VOLTAGE MODE PULSE MODE WIDTH MODULATOR |
| 中文描述： | 高-高速電壓模式脈沖寬度調制模式 |
| 文件頁數： | 5/18頁 |
| 文件大?。?/td> | 353K |
| 代理商： | UCC35705DGKTR |
SLUS473A
–
NOVEMBER 1999
–
REVISED MARCH 2001
5
www.ti.com
pin descriptions (continued)
7
2
5
8
OUT
VDD
6
GND
S
Q
Q
RD
RD
1
ILIM
200 mV
CURRENT LIMIT
1 pF
20 k
30 k
+
0.7 V
PWM
S
Q
Q
RD
CLK
PWM
LATCH
100 mV
2 * I (MODE=1)
0 (MODE = 0)
LOW LINE
1.0 V
30 * I (MODE=1)
80
(MODE = 0)
I
RC
VFF
FB
3
DISCH
4
50 mV
VDD
MODE
UCC35705 (8.8 V/8 V)
UCC35706 (12 V/8 V)
UVLO
+
–
+
–
+
–
+
–
+
–
+
–
Figure 1. Block Diagram
FUNCTIONAL DESCRIPTION
oscillator and PWM
The oscillator can be programmed to provide a duty cycle clamp or be configured to run at the maximum possible
duty cycle.
The PWM latch is set during the oscillator discharge and is reset by the PWM comparator when the C
T
waveform
is greater than the feedback voltage. The voltage at the FB pin is attenuated before it is applied to the PWM
comparator. The oscillator ramp is shifted by approximately 0.65-V at room temperature at the PWM comparator. The
offset has a temperature coefficient of approximately
–
2 mV/
°
C.
The ILIM comparator adds a pulse by pulse current limit by resetting the PWM latch when V
ILIM
> 200 mV. The PWM
latch is also reset by a low line condition (V
FF
<1.0 V).
All reset conditions are dominant; asserting any output will force a zero duty cycle output.
oscillator with duty cycle clamp (MODE = 1)
The timing capacitor CT is charged from ground to VFF through RT. The discharge path is through an on-chip current
sink that has a value of 30
×
I
DISCH
, where I
DISCH
is the current through the external resistor RDISCH. Since the
charge and discharge currents are both proportional to VIN, their ratio, and the maximum duty cycle remains constant
as VIN varies.
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相關代理商/技術參數 |
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| UCC35705DGKTRG4 | 功能描述:電壓模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 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 |
| UCC35705DR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SMPS Controller |
| UCC35705DTR | 功能描述:電壓模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 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 |
| UCC35705DTRG4 | 功能描述:電壓模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 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 |
| UCC35705EVM | 功能描述:EVAL MODULE FOR UCC35705 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產零件編號 系列:- 標準包裝:1 系列:* |
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