SM646HRK中文资料

FEATURES

?Equivalent to the Unitrode PIC 645, 646, 647?15A current capability

?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%

HIGH RELIABILITY FEATURES

?Available with high reliability processing

DESCRIPTION

The SM645/646/647 series of Power Output Stages are espe-cially designed to be driven with standard PWM integrated circuits to form an efficient switching power supply. The SM645,SM646 and SM647 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.

SWITCHING REGULATOR POWER OUTPUT STAGES

SM645/SM646/SM647

FUNCTIONAL DIAGRAM

Note 1. All packages are viewed from the top.

2. Consult factory for additional screening available.4-TERMINAL TO-3METAL CAN K - PACKAGE

Ambient

Temperature Range SM645K 0°C to 70°C SM645HRK -55°C to 125°C SM646K 0°C to 70°C SM646HRK -55°C to 125°C SM647K 0°C to 70°C SM647HRK

-55°C to 125°C

Part No.Package

Connection Diagram

CONNECTION DIAGRAMS & ORDERING INFORMATION (See Note Below)

POSITIVE OUTPUT

POSITIVE INPUT

CASE IS COMMON

1

4

3

DRIVE