DS_Q48SD12025_05032012

3

TECHNICAL SPECIFICATIONS

PARAMETER

NOTES and CONDITIONS

Q48SD12025 (Standard)

Min.

Typ.

Max.

Units

PMBus Monitoring CHARACTERISTICS

Output Current Reading Accuracy

Io=50% ~ 100% of Io, max;

-5

+5

%

Io=5% ~ 50% of Io, max;

-2

+2

A

Output Voltage Reading Accuracy

-2

+2

%

Input Voltage Reading Accuracy

-4

+4

%

Temperature Reading Accuracy

-5

+5

℃

GENERAL SPECIFICATIONS

MTBF

Io=100% of Io, max; 300LFM; Ta=25°C

TBD

M hours

Weight

Without heat spreader

52.5

grams

Weight

With heat spreader

66.5

grams

Over-Temperature Shutdown ( Without heat spreader)

Refer to Figure 22 for Hot spot 1 location (48Vin,80%

Io, 200LFM,Airflow from Vin+ to Vin-)

128

°C

Over-Temperature Shutdown

(With heat spreader)

Refer to Figure 24 for Hot spot 2 location (48Vin,80%

Io, 200LFM,Airflow from Vin+ to Vin-)

120

°C

Over-Temperature Shutdown ( NTC resistor )

Refer to Figure 22 for NTC resistor location

125

°C

Note: Please attach thermocouple on NTC resistor to test OTP function, the hot spots’ temperature is just for reference.

PIN DEFINATION

Pin#

Name

Function

Pin#

Name

Function

1

Vin(+)

7

C2

Secondary on/off control pin; The default configuration is set to ignore this

input. And such pin can be reconfigured by the PMBus Interface.

2

ON/OFF

Primary on/off control pin

8

Sig_Gnd

Signal ground

3

Vin(-)

9

Data

PMBus data line

4

Vo(-)

10 SMBAlert PMBus SMBAlert line

5

Trim

/Current sharing

Trim pin or current sharing pin,

which is option.

11 Clock

PMBus clock line

6

Vo(+)

12 Addr1

ADDR1 pin sets the high order digit of the address.

13 Addr0

ADDR0 pin sets the low order digit of the address.

SIMPLIFIED APPLICATION CIRCUIT

Vout(+)

Trim/

Current sharing

Addr0 Addr1

Vout(-)

Vin(+)

Vin(-)

On/off

Delta DC/DC

Module

EMI filter

Reverse

polarity

Protection

Fuse

Load

Input

Source

System MCU

CLOCK DATA

C2

SMB

-ALERT

CLK DATA

CTRL

ALERT

On/off control

Vout(+)

Trim/

Current sharing

Addr0 Addr1

Vout(-)

Vin(+)

Vin(-)

On/off

Delta DC/DC

Module

EMI filter

Reverse

polarity

Protection

Fuse

Load

Input

Source

System MCU

CLOCK DATA

C2

SMB

-ALERT

CLK DATA

CTRL

ALERT

On/off control