The new Japanese wireless recently developed dual H-bridge driver IC NJW4814 has begun to go public. The product is best suited for driving piezoelectric components, such as a piezoelectric component such as a zoom function such as a digital camera and a hand shake correction function, and the like are best matched.
[Summary]
Typically, the drive piezoelectric element requires a power supply voltage and an H-bridge driver around 20V to 30V. An additional boost circuit and H-bridge drive circuit are also required when driving with a Li-Ion battery or 5V power supply.
When using the NJW4814 driver, only one single piece IC can fully drive the piezoelectric element, the boost switch power supply and the H-bridge drive are integrated into the single piece, which is more convenient to use.
Further, the NJW4814 is built into a dual H-bridge driver, so only one NJW4814 can drive 2 piezoelectric elements to achieve the zoom function and hand shake correction function of digital cameras, and promote the equipment. miniaturization.
We also have a single H-bridge drive NJW4813 ※ 1.
【main feature】
1. The boost circuit and the dual H-bridge drive are completely monolithic
Monpend the boost switch power supply and dual H-bridge drive and use small package EQFN24-Le (4.0mm □), which is very suitable for miniaturized electronic equipment.
※ 1 NJW4813 package: PCSP20-E3 (3.5mm □)
2. H-bridge driver's working frequency is up to 300kHz
The H-bridge driver has a maximum of 300 kHz. The high-speed operating mode is fully supported when driving the piezoelectric element above 100 kHz.
When the piezoelectric element is operating at high speed, the H-bridge circuit has increased power consumption as the frequency increases. And use NJW4814 products to solve this problem. Since NJW4814 uses a D-MOS structure of the BCD manufacturing process, it can be completed at high speeds of low-conduction impedance to achieve low power consumption at high speed.
3. Reactive current flowing to the output voltage when the standby is turned off
The boost switch is consumed even if there is a reactive current to set the resistance to the output voltage in the standby state.
The NJW4814 can cut off the current line to the output voltage to set the resistance, so that it does not generate reactive current to power the power, thereby reaching low power consumption at the standby.
NJW4814MLE: EQFN24-Le package
【Performance】
● Boost switch regulator department
Output switching voltage 40V Max.
Switch current 1.5A min.
PWM control method
Working voltage range 2.7 ~ 5.5V
Oscillation frequency 380k ~ 1MHz
Soft start function 48 ms TYP.
Overcurrent protection function
Overvoltage protection
● H bridge drive
Equipped with Shuangli H-bridge circuit
Independent signal input
Expand detection current 300mA Typ.
Working voltage range 7.0 ~ 35V
Switching frequency 300kHz max.
Output shutdown function
FAULT signal output function
● undervoltage lock protection circuit
● Overheat protection function
● Standby function
[Application]
● Drive piezoelectric components (actuators, sensors, etc.)
● Drive MEMS components
[Production and supply status]
● Production status has been produced, technology area
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