MPX2003 datasheet(22/37 Pages) MPS

22 / 37 page

MPX2003

– UP TO 140kHz ALL-IN-ONE FLYBACK CONTROLLER

MPX2003 Rev. 1.0

MonolithicPower.com

8/5/2022

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

CS Open Protection (SOP)

During the soft-start period, there is an internal

leakage current (typically 0.5µA) flowing into the

CS pin to guarantee that the CS voltage always

exceeds VSCP when it is open. The MPX2003

implements CS open protection (SOP) to protect

the circuitry from being further damaged.

Over-Voltage Protection (OVP)

If VCC exceeds VCC-OVP (typically 26V), the

primary IC stops switching after a validation time

(tVCC-OVP). Over-voltage protection (OVP) triggers

auto-restart mode. The primary IC initiates OVP

to prevent components from breaking down due

to overstress.

Brownout Protection (BOP)

For more information about brownout protection

(BOP), see the Start-Up with Brown-In/Brownout

Detection section on page 19 and the Brownout

Protection during Normal Operation section on

page 19. BOP triggers auto-restart mode.

Primary Over-Temperature Protection

(POTP)

To prevent thermal damage on the chip, primary

over-temperature protection (POTP) shuts down

switching immediately if the junction temperature

exceeds TOTP-P (typically 150°C). The protection

flag is latched until the junction temperature

drops by T∆-P (typically 40°C).

Primary Over-Current Protection (POCP)

For more information about primary over-current

protection (POCP), see the Start-Up with Brown-

In/Brownout Detection section on page 19. If the

primary IC does not receive a start-up signal

from the secondary IC for tOCP (typically 55ms),

POCP is triggered and initiates auto-restart

mode.

Primary External Protection (PEP)

PEP is a general-purpose protection pin. When

the IC starts to operate, it begins to monitor the

voltage on PEP every 100μs to 200μs. There is

an internal current flowing out of PEP with a fixed

value of IPEP (typically 110µA). A resistor or a

bipolar

junction

transistor

(BJT)

can

connected to PEP to set the target voltage. If the

PEP voltage is below the protection trigger

threshold

(VPEP-T,

typically

0.5V)

and

the

condition lasts longer than the trigger delay time

(tPEP-T, typically 300µs), the PEP flag is set to

high. The PEP flag does not reset until VCC drops

below VCC-AUT.

PEP detection acts as a switch mode. The

current

source

only

for

several

microseconds for every 100μs to 200μs, which

can save power loss during steady state.

Typically, PEP can be used to implement an

OTP function for external power devices (e.g. the

primary MOSFET) by connecting PEP to a

negative temperature coefficient (NTC) resistor

(see Figure 7). PEP can also configure the OVP

threshold.

0.5V

PEP

Timer

Ext.P

Figure 7: Primary External Protection

Response to the Secondary Protections

For more information about responses to

secondary protections, see the Start-Up with

Brown-In/Brownout Detection section on page

19.

SECONDARY IC FUNCTIONS

Secondary IC Power Supply Management

VDD is the general-purpose power supply for the

secondary IC. The VDD voltage (VDD) can be

supplied by itself or the output voltage (VOUT).

Figure 8 shows the circuit when VDD is supplied

by VOUT.

VDD

VOUT

SGND

SDRV

SRD

MPX2003

Figure 8: VDD Supply from the Output

When the voltage supplied from VOUT is below

VDD-C, the current supply to VDD comes from SRD

to allow the MPX2003 to support low-output

applications.

MPX2003 Datasheet(PDF) 22 Page - Monolithic Power Systems

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