Datasheet InnoSwitch3-CP (Power Integrations) - 3

InnoSwitch3-CP Pin Functional Description ISENSE (IS) Pin (Pin 1)
Connection to the power supply output terminals. An external current sense resistor should be connected between this and the GND pin. If current regulation is not required, this pin should be tied
V 13 12 NC
to the GND pin.
BPP 14 11 NC NC 15 10 NC SECONDARY GROUND (GND) (Pin 2) 9 NC
GND for the secondary IC. Note this is not the power supply output
8 NC S 16-19
GND due to the presence of the sense resistor between this and the
7 FWD 6 VOUT
ISENSE pin.
5 SR FEEDBACK (FB) Pin (Pin 3) 4 BPS 3 FB
Connection to an external resistor divider to set the power supply
2 GND
output voltage.
D 24 1 IS SECONDARY BYPASS (BPS) Pin (Pin 4)
Connection point for an external bypass capacitor for the secondary IC supply. PI-7877-022216
SYNCHRONOUS RECTIFIER DRIVE (SR) Pin (Pin 5)
Gate driver for external SR FET. If no SR FET is used connect this pin Figure 6. Pin Configuration. to GND.
OUTPUT VOLTAGE (VOUT) Pin (Pin 6) InnoSwitch3-CP Functional Description
Connected directly to the output voltage, to provide current for the The InnoSwitch3-CP combines a high-voltage power switch switch, control er on the secondary-side and provide secondary protection. along with both primary-side and secondary-side control ers in one
FORWARD (FWD) Pin (Pin 7)
device. The connection point to the switching node of the transformer output winding providing information on primary switch timing. Provides power The architecture incorporates a novel inductive coupling feedback for the secondary-side control er when V is below threshold. scheme (FluxLink) using the package lead frame and bond wires to OUT provide a safe, reliable, and cost-effective means to transmit
NC Pin (Pin 8-12)
accurate, output voltage and current information from the secondary Leave open. Should not be connected to any other pins. control er to the primary control er.
UNDER/OVER INPUT VOLTAGE (V) Pin (Pin 13)
The primary control er on InnoSwitch3-CP is a Quasi-Resonant (QR) A high-voltage pin connected to the AC or DC side of the input bridge flyback control er that has the ability to operate in continuous for detecting undervoltage and overvoltage conditions at the power conduction mode (CCM), boundary mode (CrM) and discontinuous supply input. This pin should be tied to SOURCE pin to disable UV/OV conduction mode (DCM). The control er uses both variable frequency protection. and variable current control schemes. The primary control er consists
PRIMARY BYPASS (BPP) Pin (Pin 14)
of a frequency jitter oscillator, a receiver circuit magnetical y coupled to The connection point for an external bypass capacitor for the the secondary control er, a current limit control er, 5 V regulator on primary-side supply. This is also the ILIM selection pin for choosing the PRIMARY BYPASS pin, audible noise reduction engine for light standard ILIM or ILIM+1. load operation, bypass overvoltage detection circuit, a lossless input line sensing circuit, current limit selection circuitry, over-temperature
NC Pin (Pin 15)
protection, leading edge blanking, secondary output diode / SR FET Leave open. Should not be connected to any other pins. short protection circuit and a 650 V / 725 V power switch.
SOURCE (S) Pin (Pin 16-19)
These pins are the power switch source connection. Also ground The InnoSwitch3-CP secondary control er consists of a transmitter reference for primary BYPASS pin. circuit that is magnetical y coupled to the primary receiver, a constant voltage (CV) and a constant current (CC) control circuit, a 4.4 V
DRAIN (D) Pin (Pin 24)
regulator on the SECONDARY BYPASS pin, synchronous rectifier FET Power switch drain connection. driver, QR mode circuit, oscillator and timing circuit, and numerous integrated protection features. Figure 4 and Figure 5 show the functional block diagrams of the primary and secondary control er, highlighting the most important features.
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Rev. E 07/19 www.power.com Document Outline Product Highlights Description Output Power Table Pin Functional Description InnoSwitch3-CP Functional Description Primary Controller Secondary Controller Applications Example Key Application Considerations Selection of Components Recommendations for Circuit Board Layout Layout Example Quick Design Checklist Absolute Maximum Ratings Thermal Resistance Typical Performance Curves InSOP-24D Package Drawing InSOP-24D Package Marking Part Ordering Table MSL Table ESD and Latch-Up Table Part Ordering Information