UP9616PDYA datasheet(5/18 Pages) UPI

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Conceptual

uP9616

uP9616-DS-C3202, Feb. 2017

www.upi-semi.com

100

150

200

500

1000

1500

2000

2500

3000

RCOMP = 60mV/A (Fixed)

LOAD (mA)

Current Limit Protection

The uP9616 continuously monitors the inductor current,

when the inductor current is higher than current limit

threshold, the current limit function activates and forces

the upper switch turning off to limit inductor current cycle

by cycle.

Output Short Circuit Protection

The uP9616 provides output short circuit protection func-

tion. Once the output loader short-circuits, the SCP will

be triggered then always hiccup, the hiccup cycle time is

set by an internal counter. When the SCP condition is

removed or disappears, the converter will resume normal

operation and the hiccup status will terminate.

Output Over Voltage Protection

The uP9616 provides output over voltage protection. Once

the output voltage (measured the at SENSE- pin) gets higher

than OVP threshold, the OVP will be triggered to shut down

the converter. When the OVP condition disappears, the

converter will resume normal operation and resume the

normal state automatically.

Over Temperature Protection

The OTP is triggered and shuts down the uP9616 if the

junction temperature is higher than 150oC The OTP is a

non-latch type protection. The uP9616 automatically

initiates another soft start cycle if the junction temperature

drops below 130oC.

Functional Description

CV/CC Mode Control

The uP9616 provides CV/CC function. It operates in either

CV (Constant Output Voltage) mode or CC (Constant Output

Current) mode. The function provides a current limitation

function and adjusts external current limit setting

(Default=3.3A). In the CV mode, the output voltage is

controlled within +1.5%. In the CC mode, the output current

variation is less than +3% of the nominal value which can

be set up to 3.3A by the current sensing resistor.

When Output current increase until it reaches the CC limit

set by the R

SENSE resistor. At this point, the device will

transition from regulating output voltage to regulating output

current, and the output voltage will drop with increasing

load.

The CC (Constant Output Current) limit is set at 3.3A by

default with an external resistance R

SENSE = 39m

Ω

, When

the (SENSE1+) - (SENSE1-) voltage gets higher than

130mV and reaches the current limit, the driver is turned

off. The CC (Constant Output Current) limit is set according

to the following equation:

CC (Constant Output Current) Limit

SENSE

130

Output Cable Resistance Compensation

In charger applications, the large load will cause voltage

drop in the output cable. The uP9616 has a built-in cable

compensation function. When the load increases, the

cable compensator will increase an adjustable regulation

of the error amplifier that can make the output voltage

constant. Use the curve and table to adjust internal the

reference voltage values for fixed USB cable compensation

by outside resistance R

SENSE = 39m

Ω

(default), as shown in

Figure 1 and Table 1.The fixed cable compensation is

calculated as follows:

COMP

LOAD

COMP

( Ω)0

)

(

)

(

Table 1 USB Cable Compensation Application Table

Figure 1 USB Cable Compensation at

a Fixed Resistor Divider Value

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