AN32 COPAL | Alldatasheet
Document overview
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Technical content
W-6238 High Efficiency 10-LED Boost Converter. ristics are in the W-6238 data sheet.
- W-6238EVAL1 BOARD HARDWARE
an external LEDs string from an application. board schematic is shown in Figure 1. Figure 1. W-6238EVAL1 Board Schematic
Doc. No. 6050 Rev. A 2 © 2006 NIDEC COPAL ELECTRONICS CORP. (T7) and LED (T10) test points. output voltages / signals provided by W-6238. The component placement is shown in Figure 2. Figure 2. W-6238EVAL1 Board
Table 1. W-6238EVAL1 Board List of Components output through J4 header pin connector. connector (Pin #1 – Pin #2) is not jumpered.
Doc. No. 6050 Rev. A 6 © 2006 NIDEC COPAL ELECTRONICS CORP. ecitontuohtiwegnahcottcejbusscitsiretcarahC b) Dimming using a DC voltage applied to the FB pin A variable external DC voltage is applied on FB pin to adjust the LED current. As the DC voltage is increased, the voltage drop on resistor R3 is increased and the voltage drop on RSET = R1+R2 is decreased, thus the LED current decreases. The external DC voltage is applied to FB pin through a series resistor, R5, which sets the maximum DC voltage. Also, a filtered PWM signal can be considered as a variable DC voltage. – Connect the SHDN pin to V IN: jumper shunt between Pin #1 and Pin #2 of J1 connector. – Set the I LED current (i.e. ILED MAX = 20mA) – Connect the GEN/DC to FB pin through R5 resistor using one jumper between Pin #3 and Pin #4 and another jumper shunt between Pin #5 and Pin #6 of J1 connector. – Apply the variable DC voltage between GEN/DC (T3) and GND (T4). – Increase the DC voltage value (from 0V to V MAX = 3.2V). – Observe the I LED current decreases from the I LED MAX (20mA – previous set) to ILED MIN (0mA for V MAX = 3.2V with the existing resistors values, R3 = 1k , R5 = 10 k).
REVISION HISTORY
Date Rev. Reason 11/09/2006 A Initial Issue Document No: 6050 Revision: A Issue date: 11/09/06 NIDEC COPAL ELECTRONICS CORP. MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. NIDEC COPAL ELECTRONICS CORP. products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the NIDEC COPAL ELECTRONICS CORP. product could create a situation where personal injury or death may occur. NIDEC COPAL ELECTRONICS CORP. reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale . NIDEC COPAL ELECTRONICS CORP. advises customers to obtain the current version of the relevant product information before placing orders. Circuit di agrams illustrate typical semiconductor applications and may not be complete. NIDEC COPAL ELECTRONICS CORP. Japan Head Office Nishi-Shinjuku, Kimuraya Bldg., 7-5-25 Nishi-Shinjuku, Shinjuku-ku, Tokyo 160-0023 Phone: +81-3-3364-7055 Fax: +81-3-3364-7098 www.nidec-copal-electronics.com