HVLED805 STMicroelectronics, HVLED805 Datasheet - Page 13

• Manufacturer Part Number: HVLED805
• Description: IC LED DRVR ACDC OFFLINE 16NSOIC
• Manufacturer: STMicroelectronics

Specifications of HVLED805

• Constant Current: Yes
• Constant Voltage: Yes
• Internal Driver: Yes
• Type - Primary: General Purpose
• Mounting Type: Surface Mount
• Topology: AC DC Offline Switcher, PWM
• Number Of Outputs: 1
• Voltage - Supply: 11.5 V ~ 23 V
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency: -
• Voltage - Output: -
• Operating Temperature: -

HVLED805
5.1
5.2
Power section and gate driver
The power section guarantees safe avalanche operation within the specified energy rating
as well as high dv/dt capability. The Power MOSFET has a V(BR)DSS of 800V min. and a
typical R
The gate driver of the power MOSFET is designed to supply a controlled gate current during
both turn-on and turn-off in order to minimize common mode EMI. Under UVLO conditions
an internal pull-down circuit holds the gate low in order to ensure that the power MOSFET
cannot be turned on accidentally.
High voltage startup generator
Figure 10
generator). It includes an 800 V-rated N-channel MOSFET, whose gate is biased through
the series of a 12 MΩ resistor and a 14 V zener diode, with a controlled, temperature-
compensated current generator connected to its source. The HV generator input is in
common with the DRAIN pin, while its output is the supply pin of the device (Vcc). A mains
“UVLO” circuit (separated from the UVLO of the device that sense Vcc) keeps the HV
generator off if the drain voltage is below V
Figure 10. High-voltage start-up generator: internal schematic
With reference to the timing diagram of
the voltage on the input bulk capacitor is high enough, the HV generator is sufficiently
biased to start operating, thus it will draw about 5.5 mA (typical) from the bulk capacitor.
DSon
shows the internal schematic of the high-voltage start-up generator (HV
of 11 Ω.
Vc c _O K
Doc ID 18077 Rev 1
Ma i ns UV LO
14 V
Figure
CO NTRO L
START
S OURCE
H V_ EN
11, when power is applied to the circuit and
12 M
(50 V typical value).
DRAIN
Ic ha rge
IHV
Application information
Vcc
13/29