External MOS, maximum drive 50N MOSFET common anode LED constant current chip hi7000 Product Application Description：
Hi7000 is a multi-functional average current LED constant current driver with simple peripheral circuit, which is suitable for non isolated high-power constant current LED driver in wide voltage range.
The PWM port of hi7000 chip supports ultra-small duty cycle PWM dimming and can respond to the minimum pulse width of 60ns. The chip hi7000 adopts our patented algorithm to provide customers with the best solution and maximize the advantages of lamps to achieve the high brightness dimming effect of landscape stage lamp. It is 65536 (256 * 256) high brightness dimming. When the PWM port is high level, the chip works normally. For low level, the chip output is turned off.
The chip hi7000 adopts the average current control algorithm patented by our company, the output current constant current accuracy is less than ± 3%, and the output current is less affected by the input and output voltage and system inductance; the integrated loop compensation in the chip makes the peripheral circuit simple, and the system is more stable and reliable. The chip realizes the function of analog dimming through the LD port. When LD is connected with 0.2-1.2v analog dimming signal input, the system is in analog dimming mode.
When LD analog dimming mode, the port voltage is lower than 0.2V, and the output is closed. It can also use the analog dimming characteristics of LD and PWM dimming to realize soft start function. When LD and PWM pins are suspended, it is recommended to use them together with VDD pins.
External MOS, maximum drive 50N MOSFET common anode LED constant current chip hi7000 application:
●Landscape lighting LED lighting
●Stage dimming effect lamp
●LED lighting of high end automobile lamps
External MOS, maximum drive 50N MOSFET common anode LED constant current chip hi7000 driving characteristics：
● Hi7000 Support high brightness dimming, 65536:1 dimming ratio。
● Hi7000 Input voltage range 5V to 100V wide input power supply voltage
● Average current mode, adjustable output current range of 60mA ~ 5A for Hi7000
● Built in 5V voltage regulator of Hi7000
● Hi7000 External drive MOSFET, maximum drive 50N
● Hi7000 Maximum operating frequency 1MHz
●Constant current accuracy of Hi7000 ＜ ± 3%
●Support PWM dimming / analog dimming / segmented dimming of Hi7000
● Hi7000 is packaged in standard small size: SOT23-6
Pin definition and package size of common anode LED constant current chip hi7000：
Hi7000 Pin name
Hi7000 Pin function description
Current detection port
IC power supply
NMOS gate drive pin
Internal circuit frame diagram of the common anode LED constant current IC hi7000 chip
Typical application circuit of switch buck, common anode LED constant current driver chip hi7000
Schematic diagram of single way dimming application scheme of switch step-down co anode LED constant current chip hi7000
Schematic diagram of switching buck common anode LED constant current chip hi7000-rgbw four channel dimming scheme circuit