UP6204 查看數據表（PDF） - Unspecified

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UP6204

Compact Three-Phase Synchronous-Rectified Buck Controller

Unspecified 

Preliminary

uP6204

Functional Description

is over the over temperature warning level.

A PTC network is used to monitor the converter temperature.

The uP6204 asserts over demarcature warning and turns

on the internal MOSFET if

VIMAX

(2V/Div)

VOUT

(1V/Div)

UGATE1

(20V/Div)

RPTC > 0.28

RPTC + R1

The VRHOT/EN is clamped to 0.45V by internal diode and

is OK to keep the uP6204 enabled. It is highly suggest to

use 10kΩ pull high resistance so that the VRHOT/EN

can be properly clamped.

The uP6204 asserts thermal shutdown and turns off upper/

lower MOSFETs if

Time: (10ms/Div)

Figure 8. Over Current Protection.

Dynamic Phase Reduction

The uP6204 dynamically reduces the phase number of

operation to reduce the switching and conduction loss at

light load condition. This yield high efficiency over wide range

of output current.

The 20uA current source out of PSI pin produces a voltage

cross the resistor RPSI connected to this pin.

VPSI = IPSI × RPSI

The uP6204 operates with single phase if V is smaller

IMAX

than VPSI. (VPSI < 0.2V) disables the dynamic phase reduction

function.

Over Voltage and Under Voltage Protection

The FB voltage is monitored for under voltage and over

voltage protection. The OVP is triggered and turns on the

lower MOSFETs if VFB > VREF + 200mV with 10us dealy.

The OVP function is latch-off type and can only be reset by

POR or toggling the VRHOT/EN pin.

The UVP is triggered and turns off upper/lower MOSFETs if

VFB < VEAP - 300mV with 10us dealy. The UVP function

is latch-off type and can only be reset by POR or toggling

the VRHOT/EN pin.

The OVP and UVP functions are blocked about 20us when

reference voltage is changed either by PVID or SVID.

Temperature Monitoring and Chip Enable

The VRHOT/EN is multifunctional pin: high temperature

warning and chip enable as shown in Figure 9. Pulling this

pin low shuts down the uP6204. The VRHOT/EN is pulled

high to 5VCC when released. This enables the uP6204.

This pin is clamped to 0.45V when the sensed temperature

RPTC > 0.33

RPTC + R1

An NTC network is also OK for temperature monitoring.

5VCC

VRHOT/EN

10k ohm

R1

TCS

PTC

uP6204

0.3V

Thermal

Shutdown

Chip Enable

33% of

5VCC

28% of

5VCC

Figure 9. Temperature Monitoring and Chip Enable.

uPI Semiconductor Corp., http://www.upi-semi.com

11

Rev. P01, File Name: uP6204-DS-P01000

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