The invention discloses a
constant current driving device of a light-emitting
diode (LED) backlight module. The
constant current driving device of the LED backlight module comprises a
voltage conversion module, a
voltage feedback module, a backlight adjustment module and a
constant current control module, wherein the
voltage conversion module generates
direct current voltage through a
flyback topology framework, the
direct current voltage is used for lightening
LED lamp strips of the LED backlight drive, the constant current control module controls currents which flow through the
LED lamp strips of the LED backlight drive by means of control of on and off of a
metal oxide semiconductor (MOS) tube, and therefore the currents are enabled
not to exceed the largest currents which the LED can bear. The voltage feedback module achieves control of output voltage of the voltage conversion module through
negative feedback so that the purpose that the output voltage can be stabilized in a suitable range can be achieved. The backlight adjustment module controls the voltage conversion module through enable signals and
intensity control signals. In the process of utilization, a constant current drive circuit of the LED backlight module can directly generate the
direct current voltage which drives the
LED lamp strips through rectification filtering. Therefore, the constant current driving device of the LED backlight module has the advantages of being simple in circuit, high-efficient, low in cost, and capable of accurately and flexibly adjusting the backlight currents.