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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： | 31/34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
6
www.ti.com
pin assignments
CAOUT: (current amplifier output) This is the output of a wide bandwidth operational amplifier that senses line
current and commands the PFC pulse width modulator (PWM) to force the correct duty cycle. This output can
swing close to GND, allowing the PWM to force zero duty cycle when necessary.
CT: (oscillator timing capacitor) A capacitor from CT to GND sets the oscillator frequency according to:
f
+
0.725
R
T
C
T
GND: (ground) All voltages measured with respect to ground. VCC and VREF should be bypassed directly to
GND with a 0.1-
F or larger ceramic capacitor. The timing capacitor discharge current also returns to this pin,
so the lead from the oscillator timing capacitor to GND should be as short and direct as possible.
GT1: (gate drive) The output drive for the PFC stage is a totem pole MOSFET gate driver on GT1. Use a series
gate resistor of at least 10.5
to prevent interaction between the gate impedance and the GT1 output driver
that might cause the GT1 to overshoot excessively. Some overshoot of the GT1 output is always expected when
driving a capacitive load. Refer to Figure 4 for gate drive resistor selections.
GT2: (gate drive) Same as output GT1 for the second stage output drive. Limited to 50% maximum duty cycle.
IAC: (input ac current) This input to the analog multiplier is a current. The multiplier is tailored for very low
distortion from this current input (IAC) to MOUT, so this is the only multiplier input which should be used for
sensing instantaneous line voltage. Recommended maximum IAC is 500 A.
ISENSE1: (current sense) This is the non-inverting input to the current amplifier. This input and the inverting
input MOUT remain functional down to and below GND.
ISENSE2: (current sense) A resistor from the source of the lower FET to ground generates the input signal for
the peak limit control of the second stage. The oscillator ramp can also be summed into this pin, for slope
compensation.
MOUT: (multiplier output and current sense amplifier inverting input) The output of the analog multiplier and the
inverting input of the current amplifier are connected together at MOUT. As the multiplier output is a current, this
is a high impedance input so the amplifier can be configured as a differential amplifier to reject ground noise.
Multiplier output current is given by:
I
MOUT +
V
VAOUT *
1.0
I
IAC
K
V
VFF
2
Connect current loop compensation components between MOUT and CAOUT.
OVP/ENBL: (over-voltage/enable) A window comparator input which disables the PFC output driver if the boost
output is 6.67% above nominal or disables both the PFC and second stage output drivers and reset SS2 if pulled
below 1.9 V. This input is also used to determine the active range of the second stage PWM.
PKLMT: (PFC peak current limit) The threshold for peak limit is 0 V. Use a resistor divider from the negative side
of the current sense resistor to VREF to level-shift this signal to a voltage corresponding to the desired
overcurrent threshold across the current sense resistor.
PWRGND: Ground for totem pole output drivers.
RT: (oscillator charging current) A resistor from RT to GND is used to program oscillator charging current. A
resistor between 10 k
and 100 k is recommended. Nominal voltage on this pin is 3 V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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