A5974DTR STMicroelectronics, A5974DTR Datasheet - Page 35

• Manufacturer Part Number: A5974DTR
• Description: IC BUCK ADJ 2.5A 8SOIC
• Manufacturer: STMicroelectronics
• Series: -r
• Type: Step-Down (Buck)r

Specifications of A5974DTR

• Internal Switch(s): -
• Synchronous Rectifier: -
• Number Of Outputs: -
• Voltage - Output: 1.235 V ~ 35 V
• Current - Output: 2.5A
• Frequency - Switching: 250kHz
• Voltage - Input: 4 V ~ 36 V
• Operating Temperature: -
• Mounting Type: *
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11424-2

High-voltage converters
HVLED805
The HVLED805 is a high-voltage primary switcher intended for direct operation
from the rectified mains with minimized external parts to provide an efficient,
compact and cost-effective solution for LED driving. It combines a high-
performance, low-voltage PWM controller chip and an 800 V, avalanche-rugged
power MOSFET in the same package.
The PWM is a current-mode controller IC specifically designed for ZVS (zero
voltage switching) flyback LED drivers, with constant output current (CC) regulation
using primary sensing feedback. This eliminates the need for the optocoupler, the
secondary voltage reference, and the current sense on the secondary side, still
maintaining a good LED current accuracy. Moreover, it guarantees safe operation
when a short circuit of one or more LEDs occurs.
In addition, the device can also provide a constant output voltage regulation (CV):
it allows the application able to work safely when the LED string opens due to a
failure.
Key features
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Application example
AC
EVALHVLED805
STEVAL-ILL037V1
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5% accuracy on constant LED output current with primary control
Optocoupler not needed
800 V avalanche-rugged internal power MOSFET
Quasi-resonant zero voltage switching (ZVS) operation
Internal high-voltage start-up
Safe against open or shorted LED string
Automatic self supply
Input voltage feed-forward for mains independent constant-current regulation
Sales code
Board
HVLED805
4.2 W off-line LED driver with primary side regulation
3.2 W LED power supply based on HVLED805
and supply logic
HV start-up
controller
PWM
Description
Snubber
Key benefits
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Accurate primary current control
avoids the use of secondary
sensing, reducing costs and
complexity
Internal power MOSFET
high-voltage start-up allows
compact applications
Zero voltage switching improves
efficiency
Reduced external part count allows
very small form factors
SO-16N
Technical documents
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