Datasheet InnoSwitch3-Pro (Power Integrations) - 3

InnoSwitch3-Pro Pin Functional Description ISENSE (IS) Pin (Pin 1)
Connection to the power supply return output terminals. An external current sense resistor should be connected between this and the SECONDARY GROUND pin.
V 13 12 NC BPP 14 11 FWD SECONDARY GROUND (GND) (Pin 2) NC 15 10 VOUT 9 SR
GND for the secondary IC. Note this is not the power supply output
8 VB/D
GND due to the presence of the sense resistor between this and the
S 16-19 7 uVCC
ISENSE pin.
6 SDA 5 SCL NC Pin (Pin 3) 4 BPS
Leave open. Should not be connected to any other pins.
3 NC 2 GND SECONDARY BYPASS (BPS) Pin (Pin 4) D 24 1 IS
It is the connection point for an external bypass capacitor for the secondary IC supply.
I2C Clock (SCL) Pin (Pin 5)
I2C serial communication protocol clock line sourced by the Bus PI-8381-101617 master (max 700 kHz). Figure 5. Pin Configuration.
I2C Serial Data (SDA) Pin (Pin 6)
I2C serial communication protocol data line sourced by the Bus
UNDER/OVER INPUT VOLTAGE (V) Pin (Pin 13)
master (max 700 kHz). A high-voltage pin connected to the AC or DC side of the input bridge
External VCC Supply (uVCC) Pin (Pin 7)
for detecting under and overvoltage conditions at the power supply This is a 3.6 V supply for an external control er. input. When connected to the AC side of the bridge, a high-voltage switch is opened when not sensing to reduce power consumption.
VBUS Series Switch Drive and Load Discharge (VB/D) Pin (Pin 8)
This pin should be tied to GND to disable UV/OV protection. VBUS enable and driver for NMOS gate for VOUT to VBUS pass FETs. This pin can also be used to discharge output load voltage.
PRIMARY BYPASS (BPP) Pin (Pin 14)
It is the connection point for an external bypass capacitor for the
SYNCHRONOUS RECTIFIER DRIVE (SR) Pin (Pin 9)
primary IC supply. This is also the ILIM selection pin for choosing Gate driver output and connection to external SR FET gate terminal. standard ILIM or ILIM+1.
OUTPUT VOLTAGE (VOUT) Pin (Pin 10) NC Pin (Pin 15)
Connected directly to the output voltage providing current for the Leave open. Should not be connected to any other pins. secondary IC and sense for output voltage regulation. Also active
SOURCE (S) Pin (Pin 16-19)
pul -down current source for minimum load. These pins are the power switch source connection. It is also ground
FORWARD (FWD) Pin (Pin 11)
reference for primary BYPASS pin. The connection point to the switching node of the transformer output
DRAIN (D) Pin (Pin 24)
winding providing information on the primary switch timing plus This pin is the power switch drain connection. providing power for the secondary IC when V is below a OUT threshold value.
NC Pin (Pin 12)
Leave open. Should not be connected to any other pins.
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Rev. G 07/19 www.power.com Document Outline Product Highlights Description Output Power Table Pin Functional Description InnoSwitch3-Pro Functional Description Primary Controller Secondary Controller Register Definition Command Registers Telemetry (Read-back) Registers I2C Connection I2C Example Waveforms Applications Example Key application Considerations Selection of Components Components for InnoSwitch3-Pro IC Primary-Side Circuit Components for InnoSwitch3-PRO Secondary-Side Circuit Recommendations for Circuit Board Layout Layout Example Recommendations for Transformer Design Application Considerations for INN3379C and INN3370C Only Quick Design Checklist Theremal Resistance Test Conditions for INN3379C and INN3370C Absolute Maximum Ratings Thermal Resistance Key Electrical Characteristics Typical Performance Curves InSOP-24D Package Drawing Part Ordering Table MSL Table ESD and Latch-Up Table Part Ordering Information