Czy wolisz polską wersję strony elektroda?
Nie, dziękuję Przekieruj mnie tamнужны характеристики драйвера PT4519C
The verified PT4519C-family device I found online is documented as PT4519CD, with the ordering code PT4519CDEHSG in HSOP-7 package. It is not a switching buck LED driver; it is a single-stage linear, non-isolated LED driver for compact mains LED lamps/spotlights, with no inductor or transformer required. (file1.elecfans.com)
Key characteristics:
The important correction is that the available PT4519C-related datasheet identifies this part as a linear offline LED driver, not as a 500 V MOSFET buck controller. The document title is PT4519CD, while the orderable package code shown in the same datasheet is PT4519CDEHSG. So, in practice, if your chip marking or BOM says PT4519C, it is very likely this PT4519CD / PT4519CDEHSG device family. (file1.elecfans.com)
From an engineering standpoint, this IC is meant for mains-powered LED lamps where low BOM count, compact size, low EMI, and acceptable PF/efficiency are more important than galvanic isolation. The datasheet explicitly states:
That means the typical application is much closer to a direct offline linear constant-current stage after a bridge rectifier than to an inductive SMPS LED driver. The datasheet’s typical circuit indeed shows AC input, bridge rectifier, external current-setting resistor, compensation capacitor, and LED load. (file1.elecfans.com)
| Parameter | Verified value |
|---|---|
| Device family name in datasheet | PT4519CD |
| Ordering code | PT4519CDEHSG |
| Package | HSOP-7 |
| Thermal pad | GND |
| Recommended LED current | \(I_{LED} < 40\text{ mA}\) |
| HV operating voltage | 6.5 V to 500 V |
| CH / OUT breakdown | 500 V |
| Quiescent current | 160 µA typ., 250 µA max |
| CH / OUT operating voltage | 1.5 V at 30 mA |
| CS sense voltage | 610 mV |
| Current accuracy | ±3% |
| PF | >0.7 |
| Efficiency | >85% |
| Thermal resistance \(\theta_{JA}\) | 80 °C/W |
| Junction temp range | -40 °C to 160 °C |
| Storage temp range | -65 °C to 150 °C |
| Thermal compensation start | 150 °C |
These values come directly from the mirrored PT4519CD datasheet pages. (file1.elecfans.com)
The verified pin functions are:
The datasheet gives the current setting relation through the CS resistor as:
\[ I{LED} \approx \frac{610\text{ mV}}{R{CS}} \]
with \(I{LED}\) in amperes when \(R{CS}\) is in ohms, or equivalently in mA/Ω form as shown in the datasheet. (file1.elecfans.com)
Useful calculated examples:
The PF pin is used to trade off power factor versus efficiency. The datasheet states that with the PF pin effectively open in high-voltage input operation, efficiency is highest but PF is lower; with the PF pin grounded, PF is highest but efficiency is lower. This is a useful design knob when tuning the lamp to target regulatory PF or thermal limits. (file1.elecfans.com)
The COMP pin uses an external capacitor, typically 0.47 µF to 1 µF, to stabilize the loop and help keep the LED current flicker-free near low input valleys. The device also includes soft-start by internally pulling COMP high at startup to prevent output current overshoot. (file1.elecfans.com)
The most relevant currently accessible online documentation identifies the part as PT4519CD from the CR Micro / CR PowTech ecosystem, with package order code PT4519CDEHSG. This is significant because some distributor and aggregator databases mix PT4519C with other PT45xx parts; the matched datasheet I found points specifically to a high-PF, high-efficiency, flicker-free linear LED driver in HSOP-7. (file1.elecfans.com)
From a market/design perspective, this class of IC is still attractive for:
A useful way to think about PT4519C/PT4519CD is this:
Practical implication:
It is simpler and quieter electrically, but it is also more thermally constrained than a true switching converter. That is consistent with the datasheet’s recommended LED current below 40 mA, the HSOP-7 thermal package, and the explicit over-temperature current reduction. (file1.elecfans.com)
If your lamp current requirement is modest, this part is convenient. If you need significantly higher current or better efficiency across a wide voltage drop, a switching topology is usually preferable.
Because this is a mains-connected, non-isolated LED driver topology, the end product must be designed with strict attention to:
The datasheet application context is clearly offline LED lighting, so this is not a low-voltage SELV driver IC. (file1.elecfans.com)
For repair work, replacement should be done only by someone comfortable with live-mains safety, because the IC operates directly in high-voltage lamp circuitry. That is an engineering safety recommendation.
If you are selecting or replacing PT4519C, the most important checks are:
Package match
Confirm the board uses HSOP-7 and not a different pinout/package. (file1.elecfans.com)
Current-setting resistor
Measure \(R_{CS}\) and verify that the target current is within the recommended range \(<40\text{ mA}\). (file1.elecfans.com)
Thermal design
Since it is linear, check copper area and board heat spreading. The datasheet gives \(\theta_{JA}=80\,^\circ\text{C/W}\) under a defined PCB condition. (file1.elecfans.com)
PF tuning
If the lamp has PF-related performance issues, inspect the PF pin network. The datasheet explicitly allows PF/efficiency tradeoff via this pin. (file1.elecfans.com)
COMP capacitor
Check the loop capacitor on COMP; recommended external value is 0.47 to 1 µF. (file1.elecfans.com)
Application fit
Best suited for LED bulbs / spotlights / compact lighting products. (file1.elecfans.com)
If you want, I can do one of the following next:
PT4519C, based on the verified matching datasheet, is best treated as PT4519CD / PT4519CDEHSG: a single-stage linear offline LED driver in HSOP-7, intended for compact mains LED lamps. Main verified figures are ±3% current accuracy, PF > 0.7, efficiency > 85%, HV operating range 6.5–500 V, CS reference 610 mV, recommended LED current below 40 mA, and thermal current reduction starting around 150 °C. (file1.elecfans.com)
If you want, I can next give you a short one-page datasheet summary in Russian-style tabular form or calculate the exact component values for your lamp.
