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GR6004 Datasheet(PDF) 8 Page - Grenergy Opto, lnc. |
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GR6004 Datasheet(HTML) 8 Page - Grenergy Opto, lnc. |
8 / 13 page ![]() 2010.04 Ver. 1.01 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com 8 GR6004 needs to be greater than the IPEAK that shown in the Figure-1. Where, the IPEAK is the peak current of the L1. Compensation The dominate pole compensation can satisfy the loop stability of LED driving circuit by use the GR6004. Locate a capacitor in the COMP could reach this goal. The compensation capacitance range is from 1nF to 100nF. This compensation manner was applied in the normal LED application with a constant driving current. PWM Dimming The PWM dimming function can implement by adding a pull low switch in the COMP pin. Please refer the application circuit of Figure-4 to operate in this function. Over-current Protection The GR6004 has over-current protection to limit the maximum current by restricting the peak value of inductor current. Over-temperature Protection The GR6004 provides an over-temperature protection function to prevent the system damage. In the higher ambient temperature situation, the large power dissipation on the GR6004 could trip the OTP to turn the GR6004 off. The GR6004 can operate from stop state when the junction temperature of the GR6004 drops approximately 50 ℃. PCB Layout Consideration Figure-2 shows the PCB layout considerations of GR6004. These guidelines detailed below. (1) Locate the CIN, D5, L1, CO and RS closely each other to reduce the current loop of on period and off period. (2) Locate the CIN close to GR6004 as possible. (3) Locate the D5 and L1 to GR6004 as close as possible. (4) Locate the C3 to GR6004 as close as possible. D L C C VOUT VIN GND R LED R C C C GND Bottom Layer Top Layer CIN RS CO L1 D5 C3 GR6004 ON Period Current Loop OFF Period Current Loop D L C C VOUT VIN GND R LED R C C C GND Bottom Layer Top Layer CIN RS CO L1 D5 C3 ON Period Current Loop OFF Period Current Loop GR6004 Exposed Pad To the ground of CIN Figure-2 The PCB layout sketch map shown the layout considerations and the relative locations of the key components. |
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