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ESBT®: STC08DE150
Emitter Switched Bipolar Transistor STC08DE150 & PWM driver L5991 for universal input aux SMPS

STC08DE150 Product Page
L5991 Product Page

The Industrial market is continually enlarging its worldwide visibility, forcing manufacturers to align their products to the new “Universal Input” requirements. This issue is clearly cascading down to the subsystem level. Auxiliary SMPS are particularly affected since it is the entry point for all the biasing of control ICs and cooling system powering. Standardization towards “universal input” is reflected in more stressful conditions for the power transistor used as the main switch both in terms of blocking voltage or current capability.

 
ESBT: STC08DE150
Since almost all auxiliary power supplies are based on fly-back converters, the need for a blocking voltage as high as 1500V and over, coupled with high switching frequency operations make the ESBTs the perfect choice for such power supplies. The STC08DE150, in conjunction with the PWM L5991, is able to accomplish such a requirement, bringing very high efficiency as an added feature to the system.

Device Description

Following the well known ESBT nomenclature, the STC08DE150 is a 1500V, 8A hybrid ESBT device, housed in the TO247-4L package.
As in other standard ESBT devices, a square RBSOA is guaranteed at 1500V, 8A (when storage time is guaranteed to be longer than 800nsec).

Device Characteristics

Parameter
Conditions
Value (typ.)
RCS(on)
VCS= 0.6V; IC = 8A;
IB = 1.6A
0.075 Ohm
tF
As above
15ns
QGS(tot)
VBS = VCS =15V VGS = 6V
12.5nC

Reference Design
In order to better exploit ESBT features, a dedicated reference design has been developed, featuring the high power wide input range requirement of a highly demanding industrial market.
Thanks to the adoption of the L5991, the converter is able to operate in mixed mode. For higher power levels with a swithching frequency close to 90kHz, the converter operates in Continuous Current Mode (CCM), while in stand-by and for power levels lower than 25W, the converter works in Discontinuous Current Mode (DCM) at a switching frequency of about 35kHz.


Demoboard Main Features

Symbol
Description
Value
Vin
Rectified minimum Input voltage
250V to 850V
Vout1
Output voltage 1
24V / 6.25A
Vout2
Output voltage 2
5V / 0.075A
Vaux
Auxiliary Output voltage
15V / 0.01A
Pout
Maximum Output Power
150W
h
Converter Efficiency
>85%
F
Switching frequency
90kHz
Fsb
Stand-by switching frequency
35kHz


ESBT: STC08DE150


For more information see application note:
AN2131 High Power 3-Phase Auxiliary Power Supply Design Based On L5991 And ESBT STC08DE150

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