TPS2399DMT7G Datasheet TPS2399DMT7G, TPS2398DMT7G | P13-P15

TPS2398, TPS2399

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For the TPS2398 and TPS2399, the typical duration of the

soft−start ramp period, t

, is given by Equation 3.

+ 1183 @ C

IRAMP

(eq. 3)

Where:

• t

is the soft−start period in ms, and

• C

IRAMP

is given in mF

During this current ramp period, the load voltage magnitude

which is attained is estimated by Equation 4.

LSS

AVG

2 @ C

LOAD

@ C

RAMP

@ 100 @ R

SNS

@ t

(eq. 4)

Where:

• V

LSS

is the load voltage reached during soft−start,

• i

AV G

is 3.38 mA for the TPS2398 and TPS2399,

• C

LOAD

is the amount of the load capacitance, and

• t

is the soft−start period, in seconds

The quantity i

AV G

in Equation 4 is a weighted average of the

two charge currents applied to C

IRAMP

during turn−on,

considering the typical output values.

If the result of Equation 4 is larger than the maximum

input supply value, then the load can be expected to charge

completely during the inrush slewing portion of the insertion

event. However, if this voltage is less than the maximum

supply input, V

IN(MAX)

, the HSPM transitions to the

constant−current charging of the load. The remaining

amount of time required at I

MAX

is determined from

Equation 5.

LOAD

IN(MAX)

* V

LSS

REF_K(MIN)

SNS

(eq. 5)

Where:

• t

is the constant−current voltage ramp time, in

seconds, and

• V

REF_K(MIN)

is the minimum clamp voltage, 33 mV.

With this information, the minimum recommended value

timing capacitor C

FLTTM

can be determined. The delay time

needed will be either a time t

SS2

or the sum of t

SS2

and t

according to the estimated time to charge the load. The

quantity t

SS2

is the duration of the normal rate current ramp

period, and is given by Equation 6.

SS2

+ 0.35 @ C

RAMP

(eq. 6)

Where:

• C

RAMP

is given in microfarads

Since fault timing is generated by the constant−current

charging of C

FLTTM

, the capacitor value is determined from

either Equation 7 or 8, as appropriate.

FLTTM(MIN)

55 @ t

SS2

3.75

(eq. 7)

(eq. 8)

FLTTM(MIN)

55 @

SS2

) t

3.75

Where:

• C

FLTTM(MIN)

is the recommended capacitor value, in

microfarads,

• t

SS2

is the result of Equation 6, in seconds, and

• t

is the result of Equation 5, in seconds.

Continuing the typical application example, using a 100 mF

input capacitor (C

LOAD

), Equations 3 and 4 estimate the

load voltage ramping to approximately −46 V during the

soft−start period. If the module should operate down to

−72 V input supply, approximately another 1.58 ms of

constant−current charging may be required. Therefore,

Equations 6 and 8 are used to determine C

FLTTM(MIN)

, and

the result of 43 nF suggests the 47 nF standard value.

TPS2398, TPS2399

www.onsemi.com

PACKAGE DIMENSIONS

MSOP 8, 3x3

CASE 846AD

ISSUE O

E1E

A1 e b

TOP VIEW

SIDE VIEW END VIEW

DETAIL A

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC MO-187.

SYMBOL

MIN NOM MAX

0º 6º

0.05

0.75

0.22

0.13

0.40

2.90

4.80

2.90

0.65 BSC

0.25 BSC

1.10

0.15

0.95

0.38

0.23

0.80

3.10

5.00

3.10

0.60

3.00

4.90

3.00

L1 0.95 REF

0.10

0.85

TPS2398, TPS2399

www.onsemi.com

ORDERING INFORMATION

Device Marking Fault Operation Package Shipping

†

TPS2398DMT7G 2398 Latch off

MSOP−8

(Pb−Free)

3000 / Tape & Reel

TPS2399DMT7G 2399 Periodically retry

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

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TPS2398/D

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◊

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TPS2399DMT7G

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Hot Swap Voltage Controllers -48 V HOT SWAP CONTROLLER

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