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Linear Technology DC1624A Demo Manual

Ltc4225-1/ltc4225-2 dual ideal diode and hot swap controller
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Description
Demonstration circuit 1624A contains two independent rail
circuits each with Hot Swap™ and ideal diode functionality
provided by the LTC4225-1/LTC4225-2 dual ideal diode
and Hot Swap controller.
DC1624A facilitates evaluation of LTC4225 performance in
different operation modes such as supply ramp-up, power
supply switchover, steady state, and overcurrent faults.
Power supply switchover mode can be realized as either
an ideal diode functionality or as a prioritizer functionality.
Each DC1624A rail circuit is assembled to operate with a
12V supply and 11.5A maximum current load.
The main components of the board are the LTC4225
controller, two MOSFETs operating as ideal diodes, two
MOSFETs operating as Hot Swap devices, two power sense
resistors, two jumpers for independently enabling each
perForMAnce sUMMArY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Internal V
INTVCC(UVL)
V
Internal V
INTVCC(HYST)
Hysteresis
Ideal Diode Control
ΔV
Forward Regulation Voltage (V
FWD(REG)
ΔV
External N-Channel Gate Drive
DGATE
(V
DGATEN
I
CPO
CPO(UP)
N
I
DGATE
DGATE(FPU)
I
DGATE
DGATE(FPD)
Hot Swap Control
ΔV
Circuit Breaker Trip Sense Voltage
SENSE(CB)
(V
INN
ΔV
)
Active Current Limit Sense Voltage
SENSE(ACL
(V
INN
Arrow.com.
Downloaded from
Undervoltage Lockout
CC
Undervoltage Lockout
CC
- V
INN
OUT
- V
)
INN
Pull-Up Current
Fast Pull-Up Current
N
Fast Pull-Down Current
N
- V
)
ISENSEN
- V
)
ISENSEN
DEMO MANUAL DC1624A
Dual Ideal Diode and
rail, four LEDs to indicate power good and fault conditions
separately for each channel, and input voltage snubbers.
There are pads for optional RC circuits for each Hot Swap
MOSFET gate in order to adjust output voltage slew rate.
The standard configuration (as DC1624A populated by
default) places the ideal diode MOSFET ahead of the
Hot Swap MOSFET. The board also has pads for an alter-
native configuration with the Hot Swap MOSFET located
ahead of the ideal diode MOSFET.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
(T
= 25°C)
A
CONDITIONS
INTV
Rising
CC
)
ΔV
= 0.1V
FWD
IN < 7V
IN = 7V to 18V
CPO = IN = 2.9V
CPO = IN = 18V
ΔV
=0.2V, ΔV
= 0V, CPO = 17V
FWD
DGATE
ΔV
= –0.2V, ΔV
= 5V
FWD
DGATE
LTC4225-1/LTC4225-2
Hot Swap Controller
MIN
TYP
2.9
2.1
2.2
30
60
10
25
5
7
10
12
–60
–95
–50
–85
–1.5
1.5
47.5
50
55
65
MAX
UNITS
18
V
2.3
V
90
mV
40
mV
14
V
14
V
–120
µA
–110
µA
A
A
52.5
mV
75
mV
dc1624af
1

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Summary of Contents for Linear Technology DC1624A

  • Page 1 The main components of the board are the LTC4225 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the controller, two MOSFETs operating as ideal diodes, two property of their respective owners.

  • Page 2: Performance Summary

    DEMO MANUAL DC1624A perForMAnce sUMMArY = 25°C) SYMBOL PARAMETER CONDITIONS UNITS External N-Channel Gate Pull-Up Current Gate Drive On, HGATE = 0V µA HGATE(UP) External N-Channel Gate Pull-Down Current Gate Drive Off, OUT = 12V, HGATE = OUT + 5V µA...
  • Page 3 DEMO MANUAL DC1624A qUick stArt proceDUre position to the ON position. Observe the transient. The Demonstration circuit DC1624A can be easily to set up to output voltage rise time should be in the range of 12ms evaluate the performance of the LTC4225-1/LTC4225-2.
  • Page 4 THE PRIORITIZER FUNCTIONALITY TEST and D5 (PWRGD2) lights. At the same time channel 2 power supply will deliver power to the load. The DC1624A is assembled with components to imple- ment a two power rails prioritizer with channel 1 having the higher priority.
  • Page 5 DEMO MANUAL DC1624A qUick stArt proceDUre POWER SUPPLY 1 POWER SUPPLY 2 DC1624A F01 Figure 1. Measurement Equipment Setup for Hot Swap Functionality Test dc1624af Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...

  • Page 6: Parts List

    DEMO MANUAL DC1624A pArts list ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C2, C3, C8, C9, C11, C14 CAP, X7R, 0.1µF, 50V, 0603 AVX, 06035C104KAT C4, C5 CAP, X7R, 47nF, 50V, 0603 AVX, 06035C473KAT C6, C7 CAP, X7R, 15nF, 50V, 0603...

  • Page 7: Schematic Diagram

    Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 8 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.

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