HOT DD30CRTA Car, Lead Acid Battery, Charger 12V Charging, Device 3A Current 1-, 10000AH UPS Solar, Power Module, （With Terminal）

The DD30CRTA is a compact PWM switch-mode controller for charging a 12V lead-acid battery. It uses a few external components and has four charging modes: trickle, constant current, over-charge and float. The over-charge and float modes have preset regulation voltages. The constant charge current can be set with a single sense resistor. When the battery is deeply discharged, the DD30CRTA automatically applies a trickle charge of 17.5% of the constant charge current until the battery voltage reaches 75% of the over-charge voltage. The over-charge mode ends when the charging current falls to 38% of the constant charge current, and then the DD30CRTA switches to float mode. If the battery voltage drops below 83.95% of the over-charge voltage in float mode, a new charge cycle begins. The DD30CRTA also enters sleep mode when the input voltage is lower than the battery voltage. Other features include under-voltage lockout and indication.

1: The Regulation Voltage in Over Voltage Mode and Float Charge Mode
The charger regulates the voltage VOC at the BAT pin to 14.8V(Typical) with ±1.5% accuracy when the battery is in overcharge mode.
When the battery is in float charge mode, the charger reduces the voltage VFLOAT at the BAT pin to 91.57% of VOC, which is 13.55V(Typical).
Trickle Charge Mode
At the start of a charge cycle, if the battery voltage is lower than 75%×VOC, the charger enters trickle charge mode and limits the charge current to about 17.5% of the constant current.

2: End-of-Over Charge Current

When the battery voltage approaches the over-charge voltage, the charger goes into the overcharge mode. In

overcharge mode, the charge current start to decrease and when the charge current drops to 38% of constant

charge current, the charger goes into float-charge mode.

3: Float Charge Mode

After the overvoltage charge is terminated, the charger goes into float charge mode. In float charge mode, the

battery voltage is regulated to 91.57%×VOC, namely 13.55V(Typical). Float charge mode can compensate for

the loss of battery power due to self-discharge or external loading.

4: Automatic Battery Recharge

In float mode, if both the battery and the input power supply (wall adapter) are present, a new charge cycle will

begin if the battery voltage drops below 83.95%×VOC due to self-discharge or external loading.

A new charge cycle can also be started manually by plugging off the input supply and reapplying it.

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Application:

1. Car battery charging
2. Solar battery charging
3. Loudspeaker
4. Lead-Acid Battery Charger
5. Electric Bicycle Charger
6. UPS
7. Portable Industrial and Medical Equipment
8. Standalone Battery Chargers