SN6505A Texas instruments

SN6505A

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SN6505A

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Описание

The SN6505x is a low-noise, low-EMI push-pull transformer driver, specifically designed for small form factor, isolated power supplies. It drives low-profile, center-tapped transformers from a 2.25 V to 5 V DC power supply. Ultra-low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The SN6505x consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive ground-referenced N-channel power switches. The device includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switching clock can also be provided externally for accurate placement of switcher harmonics, or when operating with multiple transformer drivers. The internal protection features include a 1.7 A current limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry. SN6505x includes a soft-start feature that prevents high inrush current during power up with large load capacitors. SN6505A has a 160 kHz internal oscillator for applications that need to minimize emissions whereas SN6505B has a 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from –55°C to 125°C.

Push-pull driver for transformers
Wide input voltage range: 2.25 V to 5.5 V
High output drive: 1 A at 5 V supply
Low R_ON 0.25 Ω max at 4.5 V supply
Ultra-low EMI
Spread spectrum clocking
Precision internal oscillator options: 160 kHz (SN6505A) and 420 kHz (SN6505B)
Synchronization of multiple devices with external clock input
Slew-rate control
1.7 A Current-limit
Low shutdown current: <1 µA
Thermal shutdown
Wide temperature range: –55°C to 125°C
Small 6-Pin SOT23 (DBV) package
Soft-start to reduce In-rush current

Vin (min) (V)	2.25
Vin (max) (V)	5.5
Iout (max) (A)	1.5
Features	Enable, Short-circuit protection, Slew-rate control, Spread spectrum clocking, Thermal shutdown
Operating temperature range (°C)	-55 to 125
Rating	Catalog