IRS2505LPBF 查看數據表（PDF） - Infineon Technologies

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比赛名单

IRS2505LPBF

Boost PFC and SMPS Control IC

Infineon Technologies 

IRS2505LPBF

V, I

AC Line Voltage

Inductor Current

AC Line Current

Cross-over

distortion

time

Figure 2: PFC inductor current during the rectified AC line voltage cycle.

The IRS2505 internal control circuit blocks shown in figure 3 include; the feedback error amplifier controlling

on-time via timing capacitor (CT), zero-crossing (ZX) detection and off-time control, gate drive output, over-voltage

protection (OVP) and over-current protection (OCP). The PFC pin is a multi-function input/output pin used for driving

the external PFC MOSFET gate and also for sensing the PFC inductor current zero-crossing during the off-time. The

VBUS pin is also a multi-function pin used for monitoring the DC bus voltage through an external divider network and

also measuring the MOSFET (MPFC) source current. An internal OTA compares the voltage feedback with an

accurate internal voltage reference (VBUSREG) to control the CMP pin voltage by charging and discharging the

external compensation capacitor (CCMP). The voltage level at the CMP pin determines the on-time to control power

transfer to the output. The MOSFET current is measured with a current-sensing resistor and then AC-coupled onto

the VBUS pin through an external series resistor and capacitor.

RECT (+)

VBUS (+)

(+)

9...19.8V

(-)

VCC

3

2

COM

UVLO

OFF

Time

OCP

OVP

VBUS

5

+

4.1V

PFC

4

PFC

Logic

ON

Time

CMP

1

CT

RECT (-)

Figure 3: PFC control circuitry

11

VBUS (-)

2015-9-2

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