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IR3507MPBF Datasheet(PDF) 11 Page - International Rectifier |
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IR3507MPBF Datasheet(HTML) 11 Page - International Rectifier |
11 / 19 page IR3507PbF Page 11 of 19 IR Confidential April 2, 2009 NOT RECOMMENDED FOR NEW DESIGNS REPLACEMENT PRODUCT – IR3507ZPBF share loop is much slower than that of the voltage loop and the two loops do not interact. For proper current sharing the output of current sense amplifier should note exceed (VCCL-1.4V) under all operating condition. IR3507 THEORY OF OPERATION Block Diagram The Block diagram of the IR3507 is shown in Figure 5, and specific features are discussed in the following sections. 500K ANTI-BIAS LATCH + - 200mV PSI 550mV 620mV 1V PSI COMPARATOR PSI ASSERT CLK D Q NEGATIVE CURRENT LATCH RESET DOMINANT + S R Q PWMQ VCCL EAIN CLK D Q Q 3K + - S R Q + - + - CLK D Q + - + - + - EAIN + - S R Q VCC LGND IOUT EAIN VCCL CSIN- GATEL PGND BOOST CLKIN DACIN PHSOUT SW GATEH CSIN+ PHSIN VCC CALIBRATION RMPOUT DACIN CALIBRATION CSAOUT PWM RESET SHARE_ADJ PHSIN DACIN CALIBRATION VCCL IROSC IROSC DEBUG OFF PWM COMPARATOR PWM LATCH SHARE ADJUST AMPLIFIER DACIN-SHARE_ADJ - 1V X32.5 CURRENT SENSE AMPLIFIER BODY BRAKING COMPARATOR 1V SYNCHRONOUS RECTIFICATION DISABLE COMPARATOR + PWM RAMP GENERATOR OVP COMPARATOR GATEL NON- OVERLAP COMPARATOR + GATEL NON- OVERLAP LATCH GATEH NON- OVERLAP LATCH GATEL DRIVER GATEH DRIVER X 0.75 DEBUG COMPARATOR SET DOMINANT SET DOMINANT NEGATIVE CURRENT COMPARATOR 0.8V (LOW=OPEN) RESET DOMINANT 0.15V GATEH NON- OVERLAP COMPARATOR 200mV 100mV CLK D Q PHSIN VCCL 8CLK VCCL CLK D Q PWM_CLK . . . Q_100%DUTY (CLKIN IF 1-PHASE) + - RMPOUT 100% DUTY LATCH PWMQ Q_100%DUTY PWM_CLK CLK D Q Figure 5: Block diagram Tri-State Gate Drivers The gate drivers can deliver up to 2A peak current (4A sink current for bottom driver). An adaptive non-overlap circuit monitors the voltage on the GATEH and GATEL pins to prevent MOSFET shoot-through current while minimizing body diode conduction. The non-overlap latch is added to eliminate the error triggering caused by the switching noise. An enable signal is provided by the control IC to the phase IC without the addition of a dedicated signal line. The error amplifier output of the control IC drives low in response to any fault condition such as VCCL under voltage or output overload. The IR3507 Body Braking TM comparator detects this and drives bottom gate output low. This tri-state operation prevents negative inductor current and negative output voltage during power- down. |
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