• Personal Care Flash MCU (❋ Items in this solution Δ Other related products )
  Part Number VDD IO / SCOM ADC TIMER ROM/RAM/EEP CLOCK Others PACKAGE
HT45F3420 2.2 ~ 5.5V 8 / - 12-bitx4 1 1K / 64 / 32 8MHz HIRC H.R. PWM, OCP, OVP 8SOP
10MSOP
  HT45F3430 2.2 ~ 5.5V 22 / 4 12-bitx8 1 2K / 128 / 64 8MHz HIRC H.R. PWM, OCP, OVP,
LCD Driver,LED Driver
16NSOP
24SSOP

Traditional LED flashlight circuits use batteries to directly drive LEDs, however in such cases variable battery capacity results in inconsistent brightness or even LED damage. The HT45F34x0 Flash MCUs include an integrated high resolution PWM as well as a range of protection features, making the devices very suitable for applications which require precise battery power control.

To implement accurate power load control, the HT45F34x0 MCUs include an integrated high resolution PWM generator. Protection features are provided in the way of an over current protection (OCP) function, a battery discharging over voltage protection (OVP) function and a system low voltage reset (LVR) function, all which combine to achieve higher efficiencies, enhanced stability as well as a higher level of product safety and protection. This combination of functions ensure the devices are well matched for LED flashlight applications and other products which require precise battery power control. Compared with traditional solutions, the devices reduce the need for a large amount of external components resulting in smaller PCB areas and lower BOM costs.
Holtek has provided a block diagram, application circuits, PCB layout, component list and other technical information. To learn more about the competitive advantages of these solutions, click on “Learn more about our solutions”.

1

Application Areas

LED flashlights, solar lamps, portable moisture meters, electric toothbrushes and other products which require precise battery power control.

2

High level of functional integration, reduced costs:

The devices include two integrated 80mA PWM outputs for direct driving power MOS transistors. In addition, there are 4-level A/D converter reference voltages, which are provided to prevent A/D measurements from being influenced by variations in external voltages. This high level of functional integration results in lower production costs.

3

Accurate load power control and protection features:

The high resolution PWM output frequency can be up to 500kHz with an 8-bit resolution providing accurate load power control. The OVP and OCP functions provide real-time protection and improve product stability.

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System Architecture and Connection Diagram

This application solution provides a highly integrated 8W constant power LED flashlight reference design using a minimum of external components. The solution includes a power circuit, a reference voltage circuit, lighting constant current control, mode switching, low power indication, OVP and OCP protection, etc.

 

(C20005-A1.ZIP) LED Flashlights control board
Description Files Solution Description and Application Notes
Application Circuits Protel format
PCB Protel format
Block Diagram PDF
Code Source code
Component List   Excel format
Humidifiers
Description Files   Solution Description and Application Notes
Application Circuits Protel format
PCB Protel format
Block Diagram PDF
Code   Source code
Component List   Excel format
Humidifiers
Description Files   Solution Description and Application Notes
Application Circuits Protel format
PCB Protel format
PCB PDF
Code   Source code
Component List   Excel format
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