LINFINITY SM625, SM626, SM627 Service Manual

查询SM625供应商

SM625/SM626/SM627

SWITCHING REGULATOR POWER OUTPUT STAGES

DESCRIPTION

The SM625/626/627 series of Power Output Stages are espe­cially designed to be driven with standard PWM integrated
circuits to form an efficient switching power supply. The SM625,
SM626 and SM627 are optimized for non-isolated Buck and
Buck-Boost application. The hybrid circuit construction utilizes
thick film resistors on a beryllia substrate for maximum thermal
conductivity and resultant low thermal impedance. All of the
active elements in the hybrid are fully passivated.

FUNCTIONAL DIAGRAM

SM625/SM626/SM627

FEATURES

••

• Equivalent to the Unitrode PIC 625, 626, 627

••

••

• 15A current capability

••

••

• Designed and characterized for switching regulator

••

applications such as Buck, Boost, and Buck-Boost
type

••

• Cost saving design reduces size, improves efficiency,

••

reduces noise and RFI

••

• High operating frequency (to > 100KHz) results in

••

smaller inductor-capacitor filter and improved power
supply response time

••

• High operating efficiency at 7A typical performance -

••

Rise and fall time < 300ns
Efficiency > 85%

••

• Electrically isolated, 4-pin, TO-66 hermetic case

••

HIGH RELIABILITY FEATURES

♦♦

♦ Available with high reliability processing

♦♦

4/90 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

Copyright  1994 11861 Western Avenue

1 [phone]

∞ ∞

∞ Garden Grove, CA 92841

∞ ∞

∞∞

∞ FAX: [phone]

∞∞

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Voltage, V
Output Voltage, V
Drive Input Reverse Voltage, V
Output Current, I
Drive Current, I

Thermal Resistance

Power Switch, θ

Commutating Diode ..................................................

Case to Ambient, θ

Note 1. Exceeding these ratings could cause damage to the device.

...................................................

J - C

............................................

C - A

......................................... 60V 80V 100V

4 - 2

...................................... 60V 80V 100V

1 - 2

.......................................... 15A 15A 15A

1

............................................. -0.4A -0.4A -0.4A

3

4.0°C/W

4.0°C/W

60.0°C/W

THERMAL DATA

R Package:

Thermal Resistance­Thermal Resistance-

Junction to Case, θ
Junction to Ambient, θ

JC

.................. 4.0°C/W

.............. 40°C/W

JA

RECOMMENDED OPERATING CONDITIONS (Note 2)

Input Voltage, V
Output Voltage, V
Drive Input Reverse Voltage, V
Output Current, I
Drive Current, I

Operating Ambient Temperature Range

SM6XXR.......................................................0°C to 70°C

SM6XXHRR ........................................... -55°C to 125°C

Note 2. Range over which the device is functional.

......................................... 50V 70V 90V

4 - 2

...................................... 50V 70V 90V

1 - 2

.......................................... 13A 13A 13A

1

............................................. -0.3A -0.3A -0.3A

3

SM625/SM626/SM627

SM625 SM626 SM627

................. 5V 5V 5V

3 - 4

Operating Junction Temperature

Hermetic (R Package) ..................................................

Storage Temperature Range .............................

Lead Temperature (Soldering, 10 Seconds) ....................

Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for

thermal resistance of the package in a standard mount­ing configuration. The θ
guidelines for the thermal performance of the device/pc­board system. All of the above assume no ambient
airflow.

SM625 SM626 SM627

................. 4V 4V 4V

3 - 4

θJC are maximums for the limiting

numbers are meant to be

JA

150°C

-65°C to 150°C
300°C

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply for the operating ambient temperature of TA = 25°C. Low duty cycle pulse testing tech­niques are used which maintains junction and case temperatures equal to the ambient temperature.)

Test ConditionsParameter Units

On-State Voltage

(Note 3)

Diode Forward Voltage (Note 3)
Off-State Current
Diode Reverse Current

Note 3. Pulse test: Duration = 300µs, Duty Cycle ≤ 2%.

4/90 Rev 1.1 2/94 LINFINITY Microelectronics Inc.

Copyright  1994 11861 Western Avenue

I4 = 7A(-7A), I3 = -30mA (30mA)
I

= 15A(-15A), I3 = -30mA (30mA)

4

= 7A(-7A)

I

4

I

= 15A(-15A)

4

V

= Rated input voltage

4

= Rated input voltage, TA = 125°C

V

4

V

= Rated output voltage

1

= Rated output voltage, TA = 125°C

V

1

2 [phone]

SG625/626/627

Min. Typ. Max.

1.5

1.0

3.5

2.5

1.25

0.85

1.75

0.95
10

0.1
10

10

1.0

500

∞ ∞

∞ Garden Grove, CA 92841

∞ ∞

∞∞

∞ FAX: [phone]

∞∞

V
V
V
V

µA
µA
µA
µA