HT7L5820 Datasheet, PDF (1/14 Pages) Holtek Semiconductor Inc – Integrated PFC and Quasi-Resonant Current Mode PWM Controller

HT7L5820/HT7L5821
Integrated PFC and Quasi-Resonant
Current Mode PWM Controller
Features
• Integrated Transition Mode (TM) PFC controller
and Quasi-Resonant (QR) flyback controller
• Wide AC input range from 85VAC to 265VAC
• Integrated 650V JFET quick high voltage start-up
• Integrated THD PFC stage optimiser
• Brown-out and brown-in protection
• Internal accurate feedback reference voltage: ±2%
• Internal 9.6ms PWM soft-start
• High/Low line over-power compensation
• FB pin protection (Auto Recovery)
♦♦ Over-power and overload protection
♦♦ Short-circuit protection
♦♦ Open-loop protection
• External triggering and adjustabe over-temperature
protection – RT Pin
• VCC pin OVP – latched
• Internal over-temperature shutdown – 140°C
• 16-pin NSOP package
Applications
• AC/DC NB adapters
• Open-frame SMPS
• Battery chargers
• General LED lighting applications
• Industrial, commercial, and residential fixtures
General Description
The HT7L5820/HT7L5821 is highly integrated device
which includes a Power Factor Correction controller
and quasi-resonant flyback controller. The high level
of functional integration provides the means for very
cost-effective designs with a minimum of external
components.
In the PFC stage the device uses a transition mode to
provide a regulated output voltage with low system
costs, low harmonic distortion and high power factor.
For QR flyback the device provides higher efficiencies
and lower EMI when compared with conventional
PWM systems.
The device also includes a range of features to protect
the controller from fault conditions. These include
secondary side open-loop and over-current protection,
VCC pin over-voltage protection, DET pin over-
voltage for output over-voltage protection, brown-
in/out AC input voltage, internal over-temperature
shutdown and adjustable over-temperature protection
using the RT pin with an external NTC resistor.
Selection Table
Part No.
HT7L5820 HT7L5821
Internal OTP
Protection ^{RT Pin OTP}
Mode _{RT Pin Triggering}
Auto-
Recovery
Latched
Output Voltage OVP
Application Circuits
AC
16 14
HVS ZCD
13 _VIN
6
OPFC
9 _VSS
4
3
CSPFC INV
HT7L5820
HT7L5821
COMP
2
RT
12
FB
11
1
8
SEL OPWM
CSPWM ⁵
DET VCC
10 7
NC ¹⁵
Rev. 1.20
1
November 17, 2016