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参数资料
| 型号： | UCC35706DTR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.02 A SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOP-8 |
| 文件页数： | 17/21页 |
| 文件大小： | 604K |
| 代理商： | UCC35706DTR |
UCC25705, UCC25706, UCC35705, UCC35706
HIGH-SPEED VOLTAGE MODE PULSE WIDTH MODULATOR
SLUS473B -- NOVEMBER 1999 -- REVISED OCTOBER 2010
5
www.ti.com
pin descriptions (continued)
7
2
5
8
OUT
VDD
6GND
SQ
Q
RD
1ILIM
200 mV
CURRENT LIMIT
1pF
20 k
30 k
+
0.7 V
PWM
S
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 CT 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 VILIM > 200 mV. The PWM
latch is also reset by a low line condition (VFF <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 × IDISCH, where IDISCH 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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相关代理商/技术参数 |
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|---|---|
| UCC35706DTRG4 | 功能描述:电压模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| UCC35706P | 功能描述:电压模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| UCC35706PG4 | 功能描述:电压模式 PWM 控制器 High Speed Vltg Mode RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| UCC3570D | 功能描述:电压模式 PWM 控制器 Lo Pwr PWM RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| UCC3570DG4 | 功能描述:电压模式 PWM 控制器 Lo Pwr PWM RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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