NCS29001DGEVB
NCS29001 Evaluation Board User's Manual
Introduction
This document gives a detailed description of the NCS29001 Evaluation Board (SOIC-14 package) with the bill of materials and board schematic. The appropriate lab test setups are also provided. The NCS29001 Evaluation Board has been designed for a quick evaluation of the NCS29001 LCD backlight driver. Among its main characteristics, this evaluation board has been constructed to boost an input voltage of 24 V to drive an output LED string of 76 V at 200 mA. This document must be used with the NCS29001 datasheet available on www.onsemi.com. The datasheet contains full technical details about the NCS29001 specifications and operation. The board is implemented in two metal layers with FR-4 dielectric. The top and bottom layers have thicknesses of 35 m. The total PCB thickness is 1.62 mm with dimensions of 95.4 mm by 63.5 mm. This evaluation board can be used to evaluate the device performance and it allows the user to place the NCS29001 device in a real application environment. While the intention is to evaluate the device according to datasheet specifications, it is important to take into account the additional circuitry inherent to the setup which can affect performance.
Getting Started…
- Attach output LED string (76 V total VF)
- Set VIN = 12 V and Vinductor = 24 V
- Bring device out of standby by applying high to low transition on STBY pin
- Turn on device by applying PWM signal to PWMin pin (between 100 Hz and 300 Hz with 10% to 100% duty cycle)
EQUIPMENT
The following table details the equipment used in the context of this application note manual.
Table 1. EQUIPMENT
| Description | Main Features | Example of Equipment | Qty. |
|---|---|---|---|
| Regulated Power Supply | 25V/5A capability or greater | Chroma62012P-600-8 | 1 |
| Multimeter | - | Agilent34401A | 1 |
| Oscilloscope | - | TektronixMSO2024 | 1 |
| Current probe | - | TektronixTCP202 | 1 |
| Waveform generator | - | TektronixAFG3102 | 1 |
- Turning on the device from standby will trigger soft-start power up with smooth LED current ramp up.
- LED brightness can be varied by adjusting duty cycle on the PWM signal.
- Maximum LED current is set to 200 mA for this application.
NCS29001DGEVB
SCHEMATIC
Figure 2 shows the NCS29001 in circuit as it is implemented on the evaluation board.
Figure 2. Evaluation Board Schematic
BILL OF MATERIAL
Table 2. BILL OF MATERIAL
| Designator | Qty | Description | Value | Tolerance | Footprint | Manufacturer | Manufacturer Part Number | Substitution Allowed | Lead Free |
|---|---|---|---|---|---|---|---|---|---|
| C1 | 1 | Aluminum Electrolytic Capacitor | 47 F | 20% | 16 mm diameter | Panasonic | EEV-EB2C470SM | Yes | Yes |
| C2 | 1 | Ceramic Chip Capacitor | 10 F | 10% | 1206 | TDK | C3216X5R1H106K160AB | Yes | Yes |
| C5, C7 | 2 | Ceramic Chip Capacitor | 0.1 F | 10% | 1206 | TDK | C3216X7R1H104K | Yes | Yes |
| C6, C8 | 2 | Ceramic Chip Capacitor | 1 F | 10% | 1206 | TDK | C3216X7R1C105M | Yes | Yes |
| C4 | 1 | Aluminum Electrolytic Capacitor | Open | - | 5 mm lead spacing | - | - | - | - |
| C3 | 1 | Ceramic Chip Capacitor | 3.9 nF | 5% | 0805 | TDK | C2012C0G1H392J060AA | Yes | Yes |
| C11 | 1 | Ceramic Chip Capacitor | 20 pF | 5% | 0805 | AVX | 08051A20JAT2A | Yes | Yes |
| L1 | 1 | High Current Inductor | 47 H | 15% | 14.1 mm x 13.1 mm | Cooper Bussman | HCR-470-R | Yes | Yes |
| R1 | 1 | Through Hole Resistor | 499 k | 1% | 1 mm lead spacing | Yageo | MFR-25FBF52-499k | Yes | Yes |
| R2 | 1 | Chip Resistor | 4.99 k | 1% | 0805 | Panasonic | ERJ-6ENF4991V | Yes | Yes |
| R3 | 1 | Chip Resistor | 3.9 | 1% | 1206 | Panasonic | ERJ-8RQF3R9V | Yes | Yes |
| R5 | 1 | Chip Resistor | 576 | 1% | 0805 | Panasonic | ERJ-6ENF5760V | Yes | Yes |
| R6 | 1 | Chip Resistor | 715 k | 1% | 0805 | Panasonic | ERJ-6ENF7153V | Yes | Yes |
| R7 | 1 | Chip Resistor | 63.4 k | 1% | 0805 | Panasonic | ERJ-6ENF6342V | Yes | Yes |
| R9, R11 | 2 | Chip Resistor | Open | - | 1210 | - | - | - | - |
| R12 | 1 | Chip Resistor | 0.075 | 1% | 1206 | Panasonic | ERJ-L08UF75MV | Yes | Yes |
| R13 | 1 | Chip Resistor | Open | - | 0805 | - | - | - | - |
| R14 | 1 | Chip Resistor | 0 | 1% | 0805 | Panasonic | ERJ-6GEY0R00V | Yes | Yes |
| M1, M2 | 2 | Power MOSFET N-Channel | - | - | DPAK | ON Semiconductor | NDD05N50Z | Yes | Yes |
| D1 | 1 | Ultra-Fast Power Rectifier | - | - | Axial Lead-2 | ON Semiconductor | MUR460G | Yes | Yes |
| J5, J6, J8, J11, J12, J17, J19, J21 | 8 | PCB Test Terminal, Red | - | - | Hole diameter 1.7 mm | Keystone | 5005 | Yes | Yes |
| J1, J4 | 2 | Header 2 pin, 0.1 inch spacing | - | - | 0.100 x 2 | TE Connectivity | 647676-2 | Yes | Yes |