Rev. G 06/16

3

CHY103

www.power.com

Functional Description

CHY103 is a USB high-voltage dedicated charging port (HVDCP)

interface IC for the Quick Charge 3.0 specification. It incorporates

all necessary functions to add Quick Charge 3.0 capability to Power

Integrations’ switcher ICs such as InnoSwitch, TinySwitch, and

TOPSwitch.

CHY103 also supports other solutions with traditional secondary-side

feedback schemes such as TL431 for instance.

Figure 5 depicts CHY103 interfacing with Power Integrations’

InnoSwitch switcher IC in a configuration with hysteretic power

supply shutdown, secondary thermal protection, and faulty power

delivery protection when USB cable is unplugged.

CHY103 supports the full output range of Quick Charge 3.0 Class A

(3.6 V to 12 V) or Class B (3.6 V to 20 V) and its subset Quick Charge

2.0 Class A (5 V, 9 V, or 12 V) or Class B (5 V, 9 V, 12 V, and 20 V).

It automatically detects either Quick Charge 3.0 or Quick Charge 2.0

capable powered devices (PD) or legacy PDs compliant with USB

Battery Charging Specification revision 1.2 and only enables output

voltage adjustments accordingly.

Shunt Regulator

The internal shunt regulator clamps the BYPASS pin at 6 V when

current is provided through an external resistor (R

facilitates powering CHY103 externally over a wide output voltage

range of 3.6 V to 20 V. Recommended values are R

and C

BYPASS Pin Undervoltage

The BYPASS pin undervoltage circuitry resets the CHY103 when the

BYPASS pin voltage drops below 2.9 V. Once the BYPASS pin voltage

drops below 2.9 V it must rise back to 3.1 V to commence correct

operation.

Reference and Output Voltage Range Selection Input

Resistor R

gap reference and provides an accurate reference current for internal

timing circuits. Resistor R

voltage range. R

output voltage) and R

maximum output voltage).

Quick Charge 3.0 Interface

At power-up CHY103 turns on switch N1 (see Figure 3) short-circuiting

USB data lines D+ and D- for the initial handshake between AC-DC

adapter (DCP) and powered device (PD) as described in the USB

Battery Charging specification revision 1.2. After the USB BC 1.2

handshake is completed, CHY103 will turn off switch N1 if it detects a

Quick Charge 3.0 or Quick Charge 2.0 compliant PD. At this point the

Quick Charge 2.0 handshake followed by the Quick Charge 3.0

handshake can take place as described in the Quick Charge 2.0 and

Quick Charge 3.0 protocol specification. Upon completion of the

Quick Charge 2.0 and Quick Charge 3.0 handshakes, CHY103 will turn

on switch N2 (see Figure 3) connecting a 19.53 kΩ pull-down resistor

to USB data line D-.

Table 1 summarizes the output voltage lookup and model select table

and corresponding AC-DC adapter output voltages.

Figure 5. CHY103 with Power Integrations InnoSwitch Switcher IC with Hysteretic Fault Shutdown Protection.

Portable

Device (PD)

CHY103

D+

D-

Power Supply

Output

Note

0.6 V

0.6 V

12 V

Class A

3.3 V

0.6 V

9 V

Class A

0.6 V

3.3 V

Continuous Mode

Class A/B with

±0.2 V step size

3.3 V

3.3 V

20 V

Class B

0.6 V

GND

5 V

Default mode

Table 1.

Quick Charge 3.0 Output Voltage Lookup and Mode Select Table.

PI-7692-091815

R10

R11

C11

D11

D10

C1

R4

R3

Q1

Q2

D1

T1

C10

Q1

R6

R2

R1

D

S

IS

FB

InnoSwitch

CONTROL

BPP

U1

BP

VOUT

B+

D+

D-

GND

GND

D+

D-

R

FBD

TM

FA/P

ChiPhy

U2