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參數資料
| 型號： | IRS2500SPBF |
| 廠商： | International Rectifier |
| 文件頁數： | 14/22頁 |
| 文件大小： | 419K |
| 描述： | IC PFC |
| 產品培訓模塊： | IRS2500 PFC Control IC Overview |
| 標準包裝： | 95 |
| 系列： | * |
IRS2500S
www.irf.com
?2012 International Rectifier
14
I
LPFC
OUT
ZX
OC
VOCTH
. . .
. . .
. . .
. . .
Figure 12: Inductor current, OUT pin, ZX pin and
OC pin timing diagram.
On-time Modulation Circuit
A fixed on-time of MPFC over an entire cycle of the
line input voltage produces a peak inductor current
which naturally follows the sinusoidal shape of the
line input voltage. The smoothed, averaged line
input current is in phase with the line input voltage
for high power factor but a high total harmonic
distortion (THD), as well as individual higher
harmonics, of the current are still possible. This is
mostly due to cross-over distortion of the line
current near the zero-crossings of the line input
voltage. To achieve low harmonics that are
acceptable for compliance with international
standards and general market requirements, an
additional on-time modulation circuit has been
added to the PFC control. This circuit dynamically
increases the on-time of MPFC as the line input
voltage nears the zero-crossings (Figure 13). This
causes the peak LPFC current, and therefore the
smoothed line input current, to increase near the
zero-crossings of the line input voltage. This
reduces the amount of cross-over distortion in the
line input current which reduces the THD and
higher harmonics. The on time modulation function
is controlled via the VDC input. The full wave
rectified voltage from the bridge rectifier is divided
down by RIN and RDC to provide an input with a
peak voltage of approximately 1V at 90VAC input
and 3V at 277VAC. CDC is added to remove noise
from the signal, the value is typically 10nF. The on
time modulation function is not required in some
applications. In such cases the VDC input should
be tied to VCC through a 10K resistor.
0
0
I
LPFC
OUT
pin
near peak region of
rectified AC line
near zero-crossing region
of rectified AC line
Figure 13: On-time modulation circuit timing
diagram.
Output Over-voltage Protection
The IRS2500 incorporates both static and dynamic
overvoltage protection. Static over voltage
protection monitors the feedback voltage at the
VBUS pin and disables the gate drive output if this
voltage exceeds the target voltage by 8%. This is
activated by an internal comparator set to detect a
threshold of 2.7V, which is 8% above the regulation
threshold of 2.5V.
However, under startup condition or when a load is
removed from the output the error amplifier output
voltage at the COMP pin swings low. Since the
compensation capacitor CCOMP is connected from
this output back to the VBUS input a current will
flow during the COMP voltage transition. This pulls
down the VBUS voltage, which allows the output
voltage to exceed the desired regulation level
during the transition and results in an overshoot
before the voltage at the VBUS input exceeds the
regulation threshold.
In order to compensate for this effect, the IRS2500
includes dynamic detection of the error amplifier
output current. During a swing in the negative
direction the error amplifier output current peaks at
a much high level than the level during steady state
operation. This higher current is internally detected
and triggers the overvoltage protection circuitry
disabling the PWM output until the error amplifier
output has settled to a new level. This prevents the
output voltage from overshooting the desired level
by a significant amount under the transient
conditions described. For this reason the loop
should be designed such that voltage ripple at
COMP is minimized during steady state operation.
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相關代理商/技術參數 |
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| IRS2500STRPBF | 功能描述:功率因數校正 IC PFC controller IC RoHS:否 制造商:Fairchild Semiconductor 開關頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| IRS2500STRPBF-CUT TAPE | 制造商:IR 功能描述:IRS2500 Series Fully Integrated Fully Protected PFC SMPS Control IC - SOIC-8 |
| IRS2505LPBF | 制造商:IRF 制造商全稱:International Rectifier 功能描述:SOT-23 Boost PFC Control IC |
| IRS2505LTRPBF | 制造商:International Rectifier 功能描述:PFC BOOST IC - Tape and Reel 制造商:International Rectifier 功能描述:IC PFC MOSFET SOT-23-5 制造商:International Rectifier 功能描述:IRS2505 Series 14 V 10 mA 20.8 VCLAMP 250 mW Boost PFC Control IC - SOT-23-5 制造商:International Rectifier 功能描述:Power Factor Correction - PFC CTRL IC Boost PFC 20.8V VCC 25mA 250mW 制造商:International Rectifier 功能描述:T&R / PFC Boost IC |
| IRS25091SPBF | 功能描述:功率驅動器IC Half-Bridge Driver 600V 10V to 20V RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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