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dc1624af

DEMO MANUAL DC1624A

Description

LTC4225-1/LTC4225-2 

Dual Ideal Diode and  

Hot Swap Controller

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

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

(T

A

 = 25°C)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

IN

Input Supply Range

2.9

18

V

V

INTVCC(UVL)

Internal V

CC

 Undervoltage Lockout

INTV

CC

 Rising

2.1

2.2

2.3

V

V

INTVCC(HYST)

Internal V

CC

 Undervoltage Lockout 

Hysteresis

30

60

90

mV

Ideal Diode Control
ΔV

FWD(REG)

Forward Regulation Voltage (V

INN

 - V

OUT

)

10

25

40

mV

ΔV

DGATE

External N-Channel Gate Drive 

(V

DGATEN

 - V

INN

)

ΔV

FWD

 = 0.1V 

IN < 7V 

IN = 7V to 18V

 

10

 

12

 

14 

14

 

V

I

CPO(UP)

CPO

N

 Pull-Up Current

CPO = IN = 2.9V 

CPO = IN = 18V

–60 

–50

–95 

–85

–120 

–110

µA 

µA

I

DGATE(FPU)

DGATE

N

 Fast Pull-Up Current

ΔV

FWD

 =0.2V, ΔV

DGATE

 = 0V, CPO = 17V

–1.5

A

I

DGATE(FPD)

DGATE

N

 Fast Pull-Down Current

ΔV

FWD

 = –0.2V, ΔV

DGATE

 = 5V

1.5

A

Hot Swap Control
ΔV

SENSE(CB)

Circuit Breaker Trip Sense Voltage 

(V

INN

 - V

ISENSEN

)

47.5

50

52.5

mV

ΔV

SENSE(ACL

)

Active Current Limit Sense Voltage 

(V

INN

 - V

ISENSEN

)

55

65

75

mV

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.

Downloaded from

Arrow.com.

Содержание DC1624A

Страница 1: ...ion 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 TA 25 C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Supply Range 2 9 18 V VINTVCC UVL Intern...

Страница 2: ...nt Fast Turn Off OUT 12V HGATE OUT 5V 100 200 300 mA Input Output Pin VON TH ONN On Pin Threshold Voltage ON Rising 1 21 1 235 1 26 V VON RESET ONN Pin Fault Reset Threshold Voltage ON Falling 0 55 0 6 0 63 V VEN TH ENN Pin Threshold Voltage EN Rising 1 185 1 235 1 284 V VTMR TH TMRN Pin Threshold Voltage TMR Rising TMR Falling 1 198 0 15 1 235 0 2 1 272 0 25 V V ITMR UP TMRN Pin Pull Up Current T...

Страница 3: ...T2 turret Provide ON1 ON2 signal at the ON1 ON2 pin by mov ing the ON1_SEL ON2_SEL jumper header from OFF position to the ON position Observe the transient The output voltage rise time should be in the range of 12ms to 29ms PWRGD1 PWRGD2 green LED should be lit Turn off the rail using the ON1_SEL ON2_SEL jumper Second Step Initially adjust an electronic resistive load to 10Ω to 12Ω and connect it ...

Страница 4: ...mponents to imple ment a two power rails prioritizer with channel 1 having the higher priority Install R17 with 470 and R18 with 41 2k PlaceJP5PPR_SEL powerpriorityselect jumperinposi tion ON2 and JP4 ON2_SEL ON2 select in position OFF Apply independent supply voltages 12V to both inputs Channel 1 will be connected to load Reduce channel 1 input voltage until it reaches an undervoltage condition a...

Страница 5: ...Setup for Hot Swap Functionality Test SW1 DC1624A F01 POWER SUPPLY 1 POWER SUPPLY 2 CL1 RL1 SW2 SW3 CL2 RL2 SW4 quick start procedure Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com ...

Страница 6: ...01 2 00 80 00 00 07 0 13 8 J1 to J8 JACK BANANA KEYSTONE 575 4 14 5 JP1 JP2 JP3 JP4 JP5 HEADERS 3 PINS 2mm CTRS SAMTEC TMM 103 02 L S 15 5 XJP1 XJP2 XJP3 XJP4 XJP5 SHUNT 2mm CTRS SAMTEC 2SN BK G 16 4 Q1 Q2 Q3 Q4 N CHANNEL 30 V MOSFET PPSO 8 VISHAY Si7336ADP 17 0 Q5 Q6 Q7 Q8 OPT 18 2 RS1 RS2 RES CHIP 0 004 1 2W 1 2010 VISHAY WSL20104L000FEA 19 0 RS3 RS4 OPT 20 4 R1 R3 R13 R14 RES CHIP 10 1 0603 VIS...

Страница 7: ... SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SCHEMATIC SUPPLIED FOR USE WITH LI...

Страница 8: ... INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES The user assumes all responsibility and liability for proper and safe handling of the goods Further the user releases LTC from all claims arising from the handling or use of the goods Due to the open construction of the product it is the user s responsibility to take any and all appro...

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