UP6161 데이터 시트보기 (PDF) - Unspecified

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UP6161

Single 12V Input Supply Dual Regulator Synchronous Buck PWM and Linear Regulator Controller

Unspecified 

Preliminary

appropriate VOCP as shown in Table 1. Also shown in Table

1 is OCP level if a lower MOSFET with 10mΩ RDS(ON) is

used.

When programming the OCP level, take into consideration

the conditions that affect RDS(ON) of the lower MOSFET,

including operation junction temperature, gate driving voltage

and distribution. Consider the RDS(ON) at maximum operation

temperature and lowest gate driving voltage.

Table 1. OCP Level Selection

ROCP (Ω)

VOCP (mV)

IOCP (A)

open

-375

37.5

42k

-300

25

24k

-225

22.5

10k

-150

15

Another factor should taken into consideration is the ripple

of the inductor current. The current near the valley of the

ripple current is used for OCP, resulting the averaged OCP

level a little higher than the calculated value.

Output Under Voltage Protection of Linear Regulator

The LDRV and LFB voltages are monitored during both

softstart and normal operation for output under voltage

protection. The uP6161 asserts UVP if the error amplifier

saturates, LDRV goes to ceiling high and LFB voltage is

lower than 0.6V for 10us. This demands V > (V +

CC12

OUT

VTH + 1V) where VTH is the threshold voltage of the external

N-Channel MOSFET. This is to ensure that the output

voltage can follow the softstart signal and will not saturate

the error amplifier. That means a low threshold voltage

MOSFET is required for low VCC12 applications. This also

demands that VIN2 should be ready before the soft start

cycle is initiated.

The uP6161 disables the output voltages upon the triggering

of UVP. The uP6161 repeats the softstart cycle if the output

under voltage is not removed.

uP6161

Functional Description

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

7

Rev. P00, File Name: uP6161-DS-P0001

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