Linear Technology DC536 Manual de usuario

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 536

HOT SWAP CONTROLLER WITH MULTIFUNCTION CURRENT CONTROL

LTC4211

DESCRIPTION

Demonstration circuit DC536 is a Hot Swap controller

with multifunction current control featuring the

LTC4211. The DC536 is configured to operate with up to

7A as populated by the factory. Optional component

pads are provided for a higher power pass FET and

sense resistor for operation up to 20A.

The DC536 permits evaluating the LTC4211 during

turn-on and turn-off transients as well as during steady

state conditions.

Design files for this circuit board are available. Call

the LTC factory.

, LTC and Hot Swap are registered trademarks of Linear Technology Corpora-

tion.

Table 1.

Performance Summary (T

= 25°C)

PARAMETER CONDITION VALUE

Supply Voltage Rated operating limits 2.5V

≤

VCC

≤

16.5V

Under Voltage Lockout Transition to operating mode 2.13V

≤

CC(UVL)

≤

2.47V

ON Pin Threshold Voltage, High 1.23V

≤

CC(UVL)

≤

1.39V

ON Pin Threshold Voltage, Low 1.20V

≤

CC(UVL)

≤

1.26V

Gate Pull-Up current Charge Pump On, V

GATE

0.2V 7.5µA

≤

GATE

≤

12.5µA

ON Pin Signal Low 130µA

≤

GATE

≤

270µANormal Gate Pull-Down Current

Fast Gate Pull-Down Current • Latched and Circuit Breaker Tripped or in UVLO 50mA

Current Limit Si4410 and 7m

Ω

SENSE Resistor

FDB8030L and 2.5m

Ω

SENSE Resistor

5.7A

≤

LIMIT

≤

8.5A

16A

≤

LIMIT

≤

24A

Supply Voltage Rated operating limits 2.5V

≤

VCC

≤

16.5V

2.13V

≤

CC(UVL)

≤

2.47VUnder Voltage Lockout

ON Pin Threshold Voltage, High 1.23V

≤

CC(UVL)

≤

1.39V

1.20V

≤

CC(UVL)

≤

1.26VON Pin Threshold Voltage, Low

Gate Pull-Up current Charge Pump On, V

GATE

0.2V 7.5µA

≤

GATE

≤

12.5µA

Normal Gate Pull-Down Current ON Pin Signal Low 130µA

≤

GATE

≤

270µA

OPERATING PRINCIPLES

The LTC4211 is a low voltage hot swap controller that

has a 2.5V to 16.5V operating range and a 17V absolute

maximum operating voltage for the Vcc pin. This demo

circuit is populated for +5V operation, but it can easily

be re-adjusted for any voltage between 2.5V to 16.5V by

replacing R3 and R1 (top resistors in the feedback di-

vider and the ON pin signal divider). There are two as-

sembly options for load current. The DC536 as supplied

by the factory is populated with an Si4410 MOSFET in an

SO-8 package and a 7m

Ω

current sense resistor provid-

ing a minimum 5A load current. The DC536 has provi-

sion for an FDB8030L MOSFET in the DD package which

when used with a 2.5m

Ω

sense resistor provides a

minimum16A load current.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 536

HOT SWAP CONTROLLER WITH MULTIFUNCTION CURRENT CONTROL

QUICK START PROCEDURE

Demonstration circuit 536 is easy to set up to evaluate the performance of the LTC4211. Refer to Figure 1 for proper

measurement equipment setup and follow the procedure below:

The DC536 is factory setup to operate in a 5 volt

system at current levels up to 5 amps. If the

LTC4211 is to be evaluated at a different operating

condition, follow 2-6 below, otherwise skip to 7.

If evaluating at a voltage other than 5V, R3 must be

adjusted for proper RESET PIN response. Select

R3=V

MIN

•15K/1.223-15K, where V

MIN

is the mini-

mum output voltage expected for normal operation.

The ON pin operates as a precision comparator and

can accurately provide an adjustable under voltage

lockout. The DC536 is initially configured to turn on

at 4.15V

MIN

. If 3.3V logic will drive this pin, R1 can

be replaced with a short. If the ON pin will be used

to provide under voltage lockout, then select R1

such that R1=V

UVLO

•10K/1.39-10K, where V

UVLO

the minimum turn on voltage. Refer to the data

sheet figure 3 for common configurations

If the DC536 will operate at other than 7Amps max,

increase the value of R

SENSE

=0.99•I

LOAD

/40mV for a

1% tolerance current sense resistor.

If the DC536 will be operating above 7Amps, re-

place Q1 with a suitable DD package MOSFET such

as the FDB8030L suitable for up to 20Amps. There

is a DD package footprint on the back of the board.

The soft start and power good (RESET release) de-

lay is factory set to 6.2ms. This delay can be ad-

justed by changing C

TIMER

refer to the data sheet

Table 1 for common values and the SYSTEM

TIMING section for more detailed information.

After any necessary component changes have been

made, connect a suitable load between VOUT and

GND. This may be a passive resistive load or an ac-

tive electronic load box.

Connect a power supply capable of supplying

1.5•I

LOAD

between the VIN and GND turrets. The

minimum current capability of the supply must ac-

commodate the tolerance of the circuit breaker

threshold of ±20%. With the 7m

Ω

factory installed

sense resistor, the overload circuit breaker will trip

at between 5.7A to 8.5Amp (7Amp nominal).

Connect the ON/OFF turret to the VIN turret to

enable power to the load. A function generator can

be used to generate a single event and trigger a

scope. The DC536 provides convenient turrets for

observing the FAULT, RESET and VOUT signals.

The following experiments can be run. Turn on

into a nominal load. Turn on into an overload.

Turn on into a short circuit. Turn on into a nomi-

nal load and increase the load until the LTC4211

trips off. A digital storage scope provides a con-

venient means of observing the turn on and over-

load events. Observe the input or output current

using a current probe. A current transformer can

be used to observe turn on current transients if a

current probe is not available.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 536

HOT SWAP CONTROLLER WITH MULTIFUNCTION CURRENT CONTROL

Figure 1. Test Setup of the DC536.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 536

HOT SWAP CONTROLLER WITH MULTIFUNCTION CURRENT CONTROL

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 536

HOT SWAP CONTROLLER WITH MULTIFUNCTION CURRENT CONTROL

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DC536A-B

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