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Fixed Input Push-Pull Driver Controller --- SCM1201BTA, SCM1212BTA

Fixed Input Push-Pull Driver Controller --- SCM1201BTA, SCM1212BTA.jpg

Introduction of Fixed Input Push-Pull Driver Controller

Upgraded from SCM1201ATA and SCM1212ATA, SCM1201BTA and SCM1212BTA are the drivers integrated with MOSFETs for the primary side of a push-pull power, which feature the wide input voltage range of 2.7-5.5V and can be used in the 1-2W applications with 3.3V and 5V inputs. 


These series will not be damaged even under the high input voltage up to 9V within 1s. The two internal power MOSFETs are highly symmetrical, which can effectively reduce the degree of magnetic bias in the push-pull topology.


Key technologies of Fixed Input Push-Pull Driver Controller

SCM1201BTA and SCM1212BTA have three key technologies and meet the AEC-Q100 automobile standard to ensure reliability:

1. Soft start function: 

Limiting the current of MOSFET to avoid the damage caused by the large current impact when turning on the power, and quantitatively guarantees the capacitive load in

CC load mode.


2. Output over-current and short circuit protection: 

On the one hand, types of ic chips can distinguish the judgment and timing of overcurrent and short circuit protection to control the temperature rise of short circuit, and ensure the capacitive load for start-up and short-circuit recovery; 

On the other hand, the chip can adjust the protection threshold based on the input voltage and temperature to avoid affecting the protection function due to the change of input voltage and temperature.


3. Over-temperature protection: 

When the chip operates beyond the specified temperature, it will enter the dormancy state automatically. It will operate again when the temperature decreases to the set point.


Advantages of Fixed Input Push-Pull Driver Controller

Compared with the first-generation products, the advantages are shown in the following table:

Advantages

SCM1201ATA &

 SCM1212ATA

SCM1201BTA

SCM1212BTA

Remark

Wider 

application 

range

Input voltage range

4-8V

2.7-5.5V

Compatible with applications under 3.3V and 5V inputs

Startup voltage value

3.7V

2.7V

The max switching current

350mA@VCC=5V

600-800mA@VCC=5V

Compatible with applications with 1-2W input

Higher 

reliability

Rated Value of ESD (HBM)

2kV

6kV


Deadtime Function

Function better

1. No-load voltage is more stable

2. The current ripple is smaller

AEC-Q100 automobile standard

X

Added new feature


Better 

Performance 

Quiescent Current

0.8mA

1.2mA


Loss

1.37mA

200μA

Under voltage mode

NMOSFET’s On-Resistance Value

0.5Ω

0.2Ω


Operating Frequency Value

273kHz

220kHz


Pin-to-pin 

Design

Fully compatible with pins and package sizes of SCM1201A and SCM1212A

Pin1 of SCM1201B is changed from VSS to NC dangling pin, but it can still be connected to the original VSS potential when used



Applications of Fixed Input Push-Pull Driver Controller

Controller ICs can be widely used in isolated power supply, industrial process control, isolated communication power supply, medical device, telecommunication equipment, etc.


Typical circuit of SCM1201BTA (example for 5V input and 5V/0.2A output):

Typical circuit of SCM1201BTA (example for 5V input and 5V/0.2A output).png

Typical circuit of SCM1212BTA (example for 5V input and 5V/0.2A output):

Typical circuit of SCM1212BTA (example for 5V input and 5V/0.2A output).png

Features of SCM1201BTA, SCM1212BTA

  • Wide input voltage range: 2.7-5.5V

  • Meet AEC-Q100 automobile standard

  • Low conduction resistance: 200mΩ

  • Two built-in power MOSFETs with high symmetry, quasi-complementary driver

  • Limited MOSFET’s current when powered

  • Over-current protection and Short-circuit protection

  • Over-temperature protection

  • Under-voltage protection

* For detailed information please refer to the related datasheet, product news is for reference only.
Please refer to the technical manual for specific product parameters:

Series Power(W) Package Topology Control Mode Fsw(khz) OTP OCP SCP UVLP OLP Datasheet Sample Buy
SCM1201B ≤1 TSOT-23-6 Push-Pull - 245 Built-in Built-in Built-in Built-in Built-in
SCM1212B ≤1 SOT-23-5 Push-Pull - 245 Built-in Built-in Built-in Built-in Built-in

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