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参数资料
| 型号： | UCC38501DWTR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, SOIC-20 |
| 文件页数： | 32/34页 |
| 文件大小： | 758K |
| 代理商： | UCC38501DWTR |
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UCC28500, UCC28501, UCC28502, UCC28503
UCC38500, UCC38501, UCC38502, UCC38503
SLUS419C AUGUST 1999 REVISED NOVEMBER 2001
7
www.ti.com
pin assignments (continued)
SS2: (soft-start for PWM) SS2 is at ground for either enable low or OVP/ENBL below the UVLO2 threshold
conditions. When enabled, SS2 charges an external capacitor with a current source. This voltage is used as
the voltage error signal during start-up, enabling the PWM duty cycle to increase slowly. In the event of a disable
command or a UVLO2 dropout, SS2 quickly discharges to disable the PWM.
VAOUT: (voltage amplifier output) This is the output of the operational amplifier that regulates output voltage.
The voltage amplifier output is internally limited to approximately 5.5 V to prevent overshoot.
VCC: (positive supply voltage) Connect to a stable source of at least 20 mA between 12 V and 17 V for normal
operation. Bypass VCC directly to GND to absorb supply current spikes required to charge external MOSFET
gate capacitances. To prevent inadequate gate drive signals, the output devices are inhibited unless VCC
exceeds the upper under-voltage lockout threshold and remains above the lower threshold.
VERR: (voltage amp error signal for the second stage) The error signal is generated by an external amplifier
which drives this pin. This pin has an internal 4.5-V voltage clamp that limits GT2 to less than 50% duty cycle
to ensure transformer reset in the typical application.
VFF: (RMS feed forward signal) VFF signal is generated at this pin by mirroring one-half of IAC into a single pole
external filter. At low line, the VFF voltage should be 1.4 V.
VSENSE: (voltage amplifier inverting input) This is normally connected to a compensation network and to the
boost converter output through a divider network.
VREF: (voltage reference output) VREF is the output of an accurate 7.5-V voltage reference. This output is
capable of delivering 10 mA to peripheral circuitry and is internally short-circuit current limited. VREF is disabled
and remains at 0 V when VCC is below the UVLO threshold. Bypass VREF to GND with a 0.1-
F or larger
ceramic capacitor for best stability.
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相关代理商/技术参数 |
参数描述 |
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| UCC38501DWTRG4 | 功能描述:功率因数校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| UCC38501N | 功能描述:功率因数校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| UCC38501NG4 | 功能描述:功率因数校正 IC BiCMOS PFC/PWM Combo Cntrlr RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| UCC38502 | 制造商:TI 制造商全称:Texas Instruments 功能描述:BICMOS PFC/PWM COMBINATION CONTROLLER |
| UCC38502DW | 功能描述:功率因数校正 IC BiCMOS PFC/PWM Comb Controller RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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