The basic working principle of a DCDC step-down constant voltage chip, commonly known as a step-down or buck converter, is to switch the input voltage at high frequency through a switching element (usually a MOSFET), and then convert the impulse voltage generated by the switching into a stable DC output voltage through a low-pass filter (consisting of an inductor and a capacitor).
Here are the simplified steps for how a buck converter works:
Huihai H6225H is a step-down constant voltage chip, supporting 48V 60V 72V 80V 100V to 33V, 5V, 12V, etc. Simple periphery, built-in MOS tube.
Product Description: The H6225H is a high-voltage step-down switching controller with built-in 100V withstand voltage MOS that supports input up to 90V and can deliver 2A of continuous current to the load. The H6225H supports output constant voltage, the output voltage can be set by adjusting the VFB sampling resistor, and the maximum current limit is supported, and the maximum output current can be set by modifying the CS sampling resistor. The typical switching frequency is 130kHz, and the minimum switching frequency is 5kHz, which can ensure good output dynamic response. Under light load, the H6225H will enter PWM+PFM mode to obtain higher conversion efficiency.
The H6225H integrates soft-start, which can greatly reduce the damage to the chip caused by the surge generated during input ignition, while integrating thermal protection, output short-circuit protection, and output current limiting to provide reliable fault-tolerant operation. The H6225H integrates input line voltage compensation and a high-bandwidth loop to meet 5% output voltage accuracy. The H6225H supports low output voltage applications down to 33v。
The H6225H is available in an SOT89-5 package.
Product Features: l Built-in 100V high-voltage MOS
l Wide voltage 8V-90V input range.
l Support the output voltage can be adjusted to a minimum of 33v
l Support maximum load current of 2A.
l The conversion efficiency can reach up to 95%.
l Output line loss voltage compensation.
l Output voltage accuracy 5%.
l With soft start function (SS).
l With over-current protection function (OCP).
l With over-temperature protection (OTP) function
l With output short-circuit protection function (SCP).
Typical Applications. l Module power supply.
l Power supply for small household appliances.
l Low power constant voltage source.
l On-board instrumentation.