INN3365C datasheet(25/58 Pages) POWERINT

25 / 58 page

Rev. Q 11/22

InnoSwitch3-Pro

www.power.com

The circuit shown in Figure 27 is a 5 V / 3 A; 9 V / 3 A; 3.3 V – 11 V

PPS USB PD 3.0 compliant adapter using INN3366C IC. The power

stage is controlled by a USB PD Controller. This design features DOE

Level 6 and EC CoC 5 compliance.

Common mode choke L1 and L2 provides attenuation for EMI. Bridge

rectifier BR1 rectifies the AC line voltage and provides a full wave

rectified DC. Thermistor RT1 limits the inrush current when the

power supply is connected to the input AC supply. Fuse F1 isolates

the circuit and provides protection in case of catastrophic failure by

any of the components. Thermistor RT1 limits the inrush current

when the power supply is connected to the input AC supply.

One end of the transformer primary is connected to the rectified DC

bus; the other end is connected to the drain terminal of the integrat-

ed switch in the InnoSwitch3-Pro IC (U1).

A low-cost RCD clamp formed by diode D1, resistors R1 and R2 and

capacitor C4 limits the peak Drain voltage of U1 at the instant of

turn-off of the switch inside U1. The clamp helps to dissipate the

energy stored in the leakage reactance of transformer T1.

The InnoSwitch3-Pro IC is self-starting, using an internal high-voltage

current source to charge the PRIMARY BYPASS BPP pin capacitor (C7)

when AC is first applied. During normal operation, the primary-side

block is powered from an auxiliary winding on the transformer T1.

Output of the auxiliary (or bias) winding is rectified using diode D2

and filtered using capacitor C6. Resistor R3 and R4 along with Q1

and VR1 form a linear regulator circuit to limit the current being

supplied to the PRIMARY BYPASS pin of the InnoSwitch3-Pro IC (U1)

irrespective of the output voltage. The Zener VR2 along with resistor

R5 provides latching OVP in the event of an output overvoltage

condition.

In a flyback converter, output of the auxiliary winding tracks the

output voltage of the converter. In the event of an overvoltage at the

output of the converter, the auxiliary winding voltage increases and

causes breakdown of VR2. This causes a current to flow into the

PI-8765-020520

VBUS1/2/3/4

GND1/2/3/4

CC1

CC2

D1+/D2+

D1-/D2-

InnoSwitch3-Pro

WT6635P

INN3366C-H301

CC2

D+

D-

SDA

GPIO7

22 µF

50 V

56 pF

250 V

470 nF

50 V

C10

470 µF

16 V

C14

2.2 µF

25 V

C15

560 pF

50 V

C17

1 µF

50 V

C11

470 µF

16 V

15 µF

400 V

100 nF

275 VAC

33 µF

400 V

108 µH

VR1

DZ2S100M0L

10 V

5.6 Ω

14.7 Ω

DFLR1600-7

600 V

205 kΩ

2.2 nF

630 V

1 nF

200 V

R11

0.009 Ω

R18

1 Ω

330 pF

250 VAC

RT1

5 Ω

DFLR1200-7

200 V

MMST3904

100 Ω

3.00 kΩ

100 kΩ

1.8 MΩ

2.00 MΩ

22 Ω

AO4354

R10

47 Ω

BR1

DF206ST-G

600 V

SCL

3.15 A

J1-1

J1-2

CC1

GPIO6

C18

4.7 µF

16 V

C16

560 pF

50 V

C13

1 µF

50 V

R19

16.2 kΩ

R12

100 Ω

BAV21WS-7-F

DZ2J240MOL

24 V

DZ2J240MOL

24 V

DZ2J240MOL

24 V

R13

10 kΩ

R16

22 Ω

R17

22 Ω

R15

22 Ω

R14

22 Ω

VCC

VSS

85 - 264

VAC

16.6 mH

BPP

CONTROL

uVCC

SDA

SCL

RT2

10 kΩ

Figure 27. 5 V / 3 A; 9 V / 3 A; 3.3 V – 11 V PPS USB PD 3.0 Compliant Adapter.

PRIMARY BYPASS pin of InnoSwitch3-Pro IC (U1). If the current

flowing into the PRIMARY BYPASS pin increases above the I

threshold, the InnoSwitch3-Pro IC controller will latch-off and prevent

any further increase in output voltage.

The secondary-side of the InnoSwitch3-Pro IC provides output

voltage and output current sensing along with drive to a FET

providing synchronous rectification. The secondary output of the

transformer is rectified by FET Q2 and filtered by capacitors C10 and

C11. High frequency ringing during switching transients that would

otherwise create radiated EMI, is reduced via a RC snubber, R9 and C9.

The gate of Q2 is turned on by secondary-side controller inside U1,

based on the winding voltage sensed via resistor R10 and fed into the

FORWARD pin of the IC.

In continuous conduction mode of operation, the FET is turned off

just prior to the secondary-side requesting the start of a new

switching cycle from the primary. In discontinuous or continuous

mode of operation, the power FET is turned off when the voltage

drop across the FET falls below a threshold of V

SR(TH). Secondary-side

control of the primary-side power switch avoids any possibility of

cross conduction of the two switchs and provides extremely reliable

synchronous rectification.

The secondary-side of the IC is self-powered from either the

secondary winding forward voltage or the output voltage. Capacitor

C12, connected to the SECONDARY BYPASS BPS pin of InnoSwitch3-Pro

IC U1 provides decoupling for the internal circuitry. Capacitor C13 is

needed between the VOUT pin and the SECONDARY GROUND pin for

ESD protection.

During CC operation, when the output voltage falls, the device will

power itself from the secondary winding directly. During the on-time

of the primary-side power switch, the forward voltage that appears

across the secondary winding is used to charge the SECONDARY

BYPASS decoupling capacitor C12 via resistor R10 and an internal

regulator. This allows output current regulation to be maintained

INN3365C 데이터시트(PDF) 25 Page - Power Integrations, Inc.

INN3365C 데이터시트(HTML) 25 Page - Power Integrations, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

데이터시트 다운로드

링크 URL