Constant-current output control circuit and its design method

A method for designing a constant-current output control circuit, using a constant-current output control circuit, the method comprising the following steps:

• when a detection signal is low electrical level, a first switch is off and a second switch is on, so that a first resistor generates a first current flowing to ground, a voltage across a capacitor rises, and a voltage value of an output end of an error amplifier increases;
• when the detection signal is high electrical level, the first switch is on and the second switch is off, so that the constant current output control circuit generates a second current flowing to the capacitor, the voltage across the capacitor drops, and the voltage value of the output end of the error amplifier decreases, wherein the second current flowing to the capacitor generated by the constant current output control circuit is specifically:
• a voltage value of a reference voltage is less than an adjustable control voltage value, a voltage difference between the two ends of the first resistor is ΔVR1=VCST−VREF, and the second current flowing to the capacitor is generated on the first resistor to discharge the capacitor, the second current is:
• I
• 2
• =
• V
• CST
• -
• V
• RE
• D
• ⁢
• 1
• wherein, VCST is an adjustable control voltage;
• and wherein the constant-current output control circuit, includes a control module, the first resistor, the capacitor, and the error amplifier;
• the control module is connected to the adjustable control voltage and the detection signal, and a non- inverting input end of the error amplifier is connected to the reference voltage, an inverting input end of the error amplifier is connected to a first end of the first resistor, the output end of the error amplifier is connected to the constant current output control circuit, and a first end of the capacitor is connected to the first end of the first resistor, a second end of the capacitor is connected to the output end of the error amplifier, and a second end of the first resistor is connected to the control module.