isl6228 Intersil Corporation, isl6228 Datasheet
isl6228
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isl6228 Summary of contents
Page 1
... PWM controllers. Unlike a conventional hysteretic converter, each channel of the ISL6228 has an error amplifier that provides ±1% voltage regulation at the FB pin. The ISL6228 has a 1.5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL6228 ...
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Block Diagram VO2 PWM FREQUENCY FSET2 CONTROL − − R PWM − COMP + − EN2 BOOT2 POR UGATE2 DRIVER DIGITAL SOFT- START PHASE2 SHOOT THROUGH PROTECTION LGATE2 DRIVER ...
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... BOTTOM2 R FSET2 3 ISL6228 R VCC2 VCC2 VCC1 PVCC2 PVCC1 C VCC2 PGOOD2 PGOOD1 VIN2 VIN1 UGATE1 UGATE2 BOOT2 BOOT1 C BOOT2 PHASE2 PHASE1 ISL6228 LOW_SIDE2 LGATE2 LGATE1 PGND2 PGND1 OCSET2 OCSET1 VO2 VO1 O2 FB1 FB2 FSET2 FSET1 C FSET2 EN1 EN2 GND PGOOD1 VCC1 ...
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... Regulation Accuracy PWM Frequency Range Frequency-Set Accuracy VO Range VO Input Leakage 4 ISL6228 Thermal Information Thermal Resistance (Typical, Notes 1, 2) θ TQFN Package . . . . . . . . . . . . . . . . . . Junction Temperature Range .-55°C to +150°C Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www ...
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... OCSET 10µA Current Source OCSET 10µA Current Source Impedance R UVP Threshold OVP Rising Threshold OVP Falling Threshold OTP Rising Threshold (Note 3) OTP Hysteresis (Note 3) 5 ISL6228 = -10°C to +100°C, unless otherwise stated +25°C, VCC = 5V, PVCC = 5V. (Continued) A SYMBOL TEST CONDITIONS 0.60V ...
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... FB1 to GND is 600mV when the converter output voltage is at the programmed regulation value. 6 ISL6228 VO1 (Pin 9) The VO1 pin measures the Channel 1 converter output voltage and is used as an input to the Channel 1 R modulator. It also serves as part of Channel 1 inductor current sensing and the OCP overcurrent fault protection circuit ...
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... Connect the PGOOD2 pin to +5V through a pull-up resistor. Theory of Operation Two Separate Channels The ISL6228 is a dual channel controller. Pins 4~17 are dedicated to Channel 1, and pins 1~3 and pins 18~28 are dedicated to Channel 2. The two channels are identical and almost entirely independent, with the exception of sharing the GND pin ...
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... FIGURE 2. MODULATOR WAVEFORMS DURING LOAD TRANSIENT Power-On Reset The ISL6228 is disabled until the voltage at the VCC pin has increased above the rising power-on reset (POR) V threshold voltage. The controller will be disabled when the voltage at the VCC pin decreases below the falling POR V threshold voltage ...
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... MOSFET once the phase voltage turns positive, indicating negative inductor current. The 9 ISL6228 ISL6228 will return to CCM on the following cycle after the PHASE pin detects negative voltage, indicating that the body diode of the low-side MOSFET is conducting positive inductor current. ...
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... ISL6228 declares an OCP fault. The value then written as Equation 6: OCSET I DCR • OC -------------------------- - R = OCSET 10μA Where (Ω) is the resistor used to program the OCSET overcurrent setpoint - I is the output current threshold that will activate the ...
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... Programming the PWM Switching Frequency The ISL6228 does not use a clock signal to produce PWMs. The PWM switching frequency f is programmed by the SW resistor R that is connected from the FSET pin to the FSET GND pin. The approximate PWM switching frequency is written as Equation 10 -------------------------- - = ⋅ ...
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... DUTY CYCLE FIGURE 7. NORMALIZED RMS INPUT CURRENT 12 ISL6228 MOSFET Selection and Considerations Typically, a MOSFET cannot tolerate even brief excursions beyond their maximum drain to source voltage rating. The MOSFETs used in the power stage of the converter should have a maximum V upper voltage tolerance of the input power source and the voltage spike that occurs when the MOSFET switches off ...
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... The bottom of the ISL6228 TQFN package is the signal ground (GND) terminal for analog and logic signals of the IC. Connect the GND pad of the ISL6228 to the island of ground plane under the top layer using several vias, for a robust thermal and electrical conduction path. Connect the input capacitors, the output capacitors, and the source of the lower MOSFETs to the power ground plane ...
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... I (A) OUT FIGURE 9. CHANNEL 1 EFFICIENCY FB1 PGOOD1 PHASE1 FIGURE 11. START-UP 12V, LOAD = 0. FIGURE 13. CCM STEADY-STATE OPERATION 1.5V 3A ISL6228 100 1. Ω 1.05V FIGURE 12. SHUT-DOWN PHASE1 O2 ...
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... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 15 ISL6228 = 12V 1.5V, FIGURE 16. TRANSIENT RESPONSE, V ...
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... L28.4x4A 28 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 0, 3/07 4.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW ( 3. 75 TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 16 ISL6228 24X 28X 28X 0 . 65) NOTES: 1. Dimensions are in millimeters. Dimensions for Reference Only. 2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994. ...