ISL6341 INTERSIL [Intersil Corporation], ISL6341 Datasheet
ISL6341
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ISL6341 Summary of contents
Page 1
... Voltage-Mode PWM Control - Drives N-Channel MOSFETs • Fast Transient Response - High-Bandwidth Error Amplifier - 0% to 85% Max Duty Cycle for ISL6341, ISL6341C - 0% to 75% Max Duty Cycle for ISL6341A, ISL6341B • Lossless, Programmable Overcurrent Protection - Uses Lower MOSFET’s r See Table 1. - Latch off mode (ISL6341, ISL6341B) - Infinite Retry (Hiccup) Mode (ISL6341A) - Infinite Retry (Hiccup) Mode ...
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... ISL6341, ISL6341A, ISL6341B, ISL6341C Pinout Block Diagram SAMPLE AND HOLD 10µA TO LGATE/OCSET FB 5V INT. 20µA COMP/EN VOS 2 ISL6341, ISL6341A, ISL6341B, ISL6341C (10 LD 3x3 TDFN) TOP VIEW BOOT 1 10 PHASE 2 9 UGATE 3 8 LGATE/OCSET 4 7 GND 5 6 POR AND + SOFT-START - OC COMPARATOR 5V INT. ...
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... ISL6341, ISL6341A, ISL6341B, ISL6341C Typical Application TYPE II COMPENSATION SHOWN OFFSET 12V DCPL 5V TO 12V VCC BOOT 6 PGOOD BOOT PHASE 2 COMP/EN ISL6341x 7 UGATE LGATE/OCSET VOS GND R OCSET R R VOS1 S R VOS2 V IN 1.5V TO 12V ...
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... Operating Conditions BOOT <36V) BOOT-GND Supply Voltage Range, V Ambient Temperature Range ISL6341xCRZ (Commercial 0°C to +70°C ISL6341xIRZ (Industrial .-40°C to +85°C Junction Temperature Range .-40°C to +125°C = 12V 0°C to +85°C, Unless Otherwise Noted. Parameters with MIN and/or MAX CC J SYMBOL ...
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... NOTES: 3. Limits should be considered typical and are not production tested. 4. Limits established by characterization and are not production tested. 5. The UVP is disabled on the ISL6341C; no trip point is measured. Functional Pin Description VCC (Pin 6) This pin provides the bias supply for the ISL6341x, as well as the lower MOSFET’ ...
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... When the pull-down device is released, the COMP/EN pin will start to rise rate determined by the 20µA charging up the capacitance on the COMP/EN pin. When the COMP/EN pin rises above the V trip point, the ISL6341x will begin a ENABLE new initialization and soft-start cycle. LGATE/OCSET (Pin 4) Connect this pin to the gate of the lower MOSFET ...
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... If the output is pre-biased to a voltage less than the expected OCSET value (as shown by the magenta curve), the ISL6341x will detect that condition. Neither MOSFET will turn-on until the soft-start ramp voltage exceeds the output; V seamlessly ramping from there. There is a restriction for the pre-bias case ...
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... This minimum width will also act as a boot-refresh function. If the boot capacitor loses any charge while UGATE is high, it will be refreshed each cycle while LGATE is high. The ISL6341x share most of the detection circuitry; the main difference among them is what happens after detection. ISL6341, ISL6341B ...
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... OCP tripping. It would also be very sensitive to system noise and in-rush current spikes should be avoided. The maximum setting is 550mV, but most of the recommended MOSFETs for the ISL6341x are not expected to handle the power of the maximum trip point. There is no way to disable the OCP, but setting it above the maximum value (> ...
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... V is pulled low by the disturbance, as well as the OUT load rate determine by the conditions, and the output components. The ISL6341C version does not have UVP; it relies on the OCP for shorted loads. The PGOOD UV comparator is separate, and is still active (0.25V/DIV) ...
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... PGOOD (OV; +10%) PGOOD (OCP) Switching Frequency The switching frequency is a fixed 300kHz for the ISL6341, ISL6341C and 600kHz for the ISL6341A, ISL6341B. It cannot be adjusted externally, and the various soft-start delays and ramps are fixed at the same times for either frequency. Output Voltage Selection The output voltage can be programmed to any level between the 0 ...
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... COMP/EN pin should be used to disable V supplies are ready. Figure 10 shows a simple sequencer for this situation powers up first, Q will be off and on, keeping the ISL6341x in shut-down. When V 2 on, the resistor divider R and R determines when on, which will turn off Q , and release the shut-down ...
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... Please note that the capacitors C represent numerous physical capacitors. For best results, locate the ISL6341x within 1 inch of the MOSFETs, Q The circuit traces for the MOSFET gate and source connections from the ISL6341x must be sized to handle peak current BOOT ...
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... ISL6341, ISL6341A, ISL6341B, ISL6341C The compensation network consists of the error amplifier (internal to the ISL6341x) and the external R components. The goal of the compensation network is to provide a closed loop transfer function with high 0dB crossing frequency (F ; typically 0 margin (better than 45°). Phase margin is the difference ...
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... Given a sufficiently fast control loop design, the ISL6341x will provide either 0% or 100% duty cycle in response to a load transient. The response time is the time required to slew the inductor current from an initial current value to the transient current level ...
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... N-MOSFETs. Look for r should be exercised with devices exhibiting very low V GS(ON) present aboard the ISL6341x may be circumvented by these MOSFETs if they have large parasitic impedences and/or capacitances that would inhibit the gate of the MOSFET from being discharged below its threshold level before the complementary MOSFET is turned on ...
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... ISL6341, ISL6341A, ISL6341B, ISL6341C Thin Dual Flat No-Lead Plastic Package (TDFN INDEX AREA TOP VIEW C SIDE VIEW SEATING PLANE D2 7 (DATUM B) D2 INDEX AREA (DATUM N (Nd-1)Xe REF. BOTTOM VIEW C L (A1 SECTION "C-C" ...