5202 single chip charging circuit comparison

0201 package SLP0603 ESD electrostatic diode 5V one-way ESD

[1] Low-end car charger solution realized by single chip 34063

Advantages: low cost;

Disadvantages: (1) Poor reliability, single function; no over temperature protection, short circuit protection and other safety measures;

(2) Although the output is DC voltage, the way to control the output constant current charging current is the maximum switching power.

Flow peak limit, accuracy is not high enough;

(3) Since 34063 is 1.5A switching current PWM+PFM mode (no error amplifier inside),

Its car charging scheme output DC voltage and current ripple is relatively large, not pure enough; output current capability is also very

Limited; (common in low-end car chargers between 300ma and 600ma)

[2]34063+NPN (NMOS) to achieve the expansion of the car charging program

Advantages: The flow is expanded on the basis of the [1] scheme to meet the growing demand for charging current capability;

Disadvantages: There are similar deficiencies in the [1] scheme;

[3] 2576+358 program

advantage:

(1) Combined with 358 (double op amp) due to 2576 built-in overcurrent protection, over temperature protection and other safety measures

To achieve output constant voltage CV, constant current CC, overvoltage protection OVP and other functions; achieve reliable, safe, and complete

Good lithium battery charging solution;

(2) Since the 2576 is a fixed 52K PWM converter, the EMI design of the car charger is relatively easy;

(3) Since both 2576 and 358 are manufactured by 40V high-voltage bipolar process, they are more "skinny";

(4) This scheme is commonly used in car chargers of about 0.8A ~ 1.5A;

Disadvantages:

(1) The system is relatively complex and costly;

(2) Constant current CC and overvoltage protection OVP is to control the 2576 EN through the output of 358.

Now, therefore, the charging current has a relatively large ripple, and the response speed of CC and OVP is not fast enough (through

Switch 2576 to work to achieve);

[4] Core Dragon single-chip car charger IC solution

Advantages: In addition to the corresponding advantages of the [3] scheme, there are:

(1) A fully integrated solution for car chargers with low system cost and high reliability;

(2) The internal CV, CC, and OVP of the IC are realized by controlling the PWM; therefore, the output voltage,

Output current, output overvoltage protection with higher precision and fast response;

Disadvantages: (1) low operating frequency (52KHz), large external inductance (100uH);

(2) The external components are complex, and external Schottky diodes are connected;

(3) Low work efficiency ("90%")

[5] 5202 single-chip car charger IC solution

Advantages: In addition to the corresponding advantages of the [34] scheme, there are:

(1) High operating frequency (340KHz), small external inductance (10uH);

(2) The peripheral components are simple, and the Schottky diode is built in;

(3) Built-in switching MOSFET with low internal resistance (<130mΩ) High efficiency (>90%)