HIP1015 Просмотр технического описания (PDF) - Intersil

Номер в каталоге

Компоненты Описание

производитель

HIP1015

Power Distribution Controllers

Intersil 

HIP1015,HIP1016

Physical layout of RSENSE resistor is critical to avoid the

possibility of false overcurrent occurrences. Ideally trace

routing between the RSENSE resistors and the HIP1015 and

HIP1016 is direct and as short as possible with zero current

in the sense lines. (See Figure 1.)

CORRECT

INCORRECT

TO ISEN AND

RISET

CURRENT

SENSE RESISTOR

FIGURE 1. SENSE RESISTOR PCB LAYOUT

Using the HIP1016 as a -48V Low Side Hot

Swap Power Controller

To supply the required VDD, it is necessary to maintain the

chip supply 12V above the -48V bus. This may be

accomplished with a +12V Regulator between the voltage

rail and pin 5 (VDD). By using a Regulator, the designer may

ignore the bus voltage variations. However, a low-cost

alternative is to use a Zener diode (See Figure 2 for typical

5A load control ) this option is detailed below.

Note that in this configuration the PGOOD feature (pin 7) is

not operational.

RCL

1.58kΩ

1W

LOAD

0.001µF

HUF7554S3S

0.005

1%

1.47kΩ

1%

2kΩ

0.01µF

HIP1016

DD1

12V

0.047µF

VBUS

-48V

FIGURE 2.

NC

PWRON

Biasing the HIP1016

Table 3 gives typical component values for biasing the

HIP1016 in a 48V application. The formulas and calculations

deriving these values are also shown below.

TABLE 3. TYPICAL VALUES FOR A -48V HOT SWAP

APPLICATION

SYMBOL

PARAMETER

RCL

DD1

1.58kΩ, 1W

12V Zener Diode, 50mA Reverse Current

When using the HIP1016 to control -48V, a Zener diode may

be used to provide the +12V bias to the chip. If a Zener is

used then a current limit resistor should also be used.

Several items must be taken into account when choosing

values for the current limit resistor (RCL) and Zener Diode

(DD1):

• The variation of the VBUS (in this case, -48V)

• The chip supply current needs for all functional conditions

• The power rating of RCL.

• The current rating of DD1

Formulas

1. Sizing RCL:

RCL = (VBUS,MIN - 12)/ICHIP

2. Power Rating of RCL:

PRCL = IC(VBUS,MAX - 12)

3. DD1 Current Rating:

IDD1 = (VBUS,MAX - 12)/RCL

Example:

A typical -48V supply may vary from -36 to -72V. Therefore,

VBUS,MAX = -72V

VBUS,MIN = -36V

ICHIP = 15mA (max)

Sizing RCL:

RCL = (VBUS,MIN - 12)/IC

RCL = (36 - 12)/0.015

RCL = 1.6kΩ [Typical Value = 1.58kΩ]

Power Rating of RCL:

PRCL = IC(VBUS,MAX - 12)

PRCL = (0.015)(72 - 12)

PRCL = 0.9W [Typical Value = 1W]

DD1 Current Rating:

IDD1 = (VBUS,MAX - 12)/RCL

IDD1 = (72 - 12)/1.58kΩ

IDD1 = 38mA [Typical Value = 12V rating, 50mA reverse

current]

5

Share Link: