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QH7935 Datasheet Preview

QH7935 Datasheet

PSR Single-Stage APFC Offline LED Driver

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QH7935
PSR Single-Stage APFC Offline LED Driver
Description
The QH7935 is a high precision primary-side
regulation driver with single stage Active PFC,
specially designed for universal input offline flyback
or buck-boost constant current LED lighting. The
driver with on-chip PFC circuit achieves high power
factor and low THD. Operating in critical conduction
mode, the power MOSFET switching loss is reduced
and the inductor is fully utilized.
The QH7935 adopts proprietary primary side current
sensing scheme. It can precisely control the LED
current without secondary side sense and feedback
circuits. The device integrates a 650V power
MOSFET to further reduce external components, for
saving cost and PCB area.
The ilizes patented line and load voltage
compensation method to achieve excellent line and
load regulation.
The QH7935 offers rich protection functions to
improve the system reliability, including LED open
circuit protection, LED short circuit protection, VCC
over voltage protection, VCC under voltage protection,
CS resistor open protection and cycle by cycle current
limit. All the protection functions are auto-recovery.
The system reliability is further improved by the
thermal regulation function. The output current is
reduced when the driver is over temperature.
Typical Application
Features
Single-Stage Active PFC for High Power Factor
and Low THD
Primary Side Control Constant Current Operation,
No Opto-Coupler required
Integrated 650V Power MOSFET
±3% LED Current Accuracy
Excellent Line and Load Regulation
Critical Conduction Mode Operation
Ultra-Low (33uA) Startup Current
High Resistance Feedback Resistor for Improved
Efficiency
LED Open and Short Circuit Protection
CS Resistor Open Circuit Protection
Cycle-by-Cycle Current Limit
VCC Over-voltage and Under-voltage Protection
Auto Fault Recovery
Thermal Regulation Function
Available in SOP-8 package
Applications
E27/ GU10 LED Bulb, Spot Light
PAR30, PAR38 LED Lamp
T8/T10 LED String
Other LED Lighting
AC
NA
NP NS
QH7935
2 VCC DRAIN 5
3 FB
DRAIN 6
1 COMP
4 CS
GND 7
GND 8
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Figure 1. Typical application circuit for QH7935
1




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QH7935 Datasheet Preview

QH7935 Datasheet

PSR Single-Stage APFC Offline LED Driver

No Preview Available !

Ordering Information
Part Number
Package
QH7935
SOP8
Operating
Temperature
-40 to 105
Package Method
Tape
2,500 Piece/Roll
Marking
QH7935
XXXXXY
WXYY
Pin Configuration and Marking Information
Pin Definition
Pin No.
Name
1 COMP
2 VCC
3 FB
4 CS
5,6 DRAIN
7,8 GND
COMP
VCC
FB
CS
GND
GND
DRAIN
DRAIN
Figure 2. Pin configuration
XXXXXY: Lot Code
W: Sign
X: Year
YY: Week
Description
Loop Compensation Node. This pin connects a capacitor to GND for
stabilization of the control loop, achieving accurate LED current, high
Power Factor and low THD.
Power Supply Pin. Connect a bypass capacitor from this pin to GND.
Feedback Voltage Input Pin. This pin detects the transformer
demagnetization signal and the output voltage.
Current Sense Pin. Connect a resistor to GND to sense the power
MOSFET current.
Internal HV Power MOSFET Drain.
Ground.
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2


Part Number QH7935
Description PSR Single-Stage APFC Offline LED Driver
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