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PDF THX-203H Data sheet ( Hoja de datos )

Número de pieza THX-203H
Descripción Switching Power Controller IC
Fabricantes ETC 
Logotipo ETC Logotipo



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THX203H
Switching Power Controller IC
Contents
Introduction, characteristics and application field ···································································· 3
Reference frame of interior circuit···························································································· 4
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Description of pinsfunction ···································································································· 4
Ultimate parameters ················································································································· 5
Recommended working condition ···························································································· 5
Electric parameters ··················································································································· 5
Principal Discription················································································································· 7
Definition of Electric Parameters ····························································································· 8
Application information ··········································································································· 9
Typical application circuit ······································································································ 11
Components Listing ··············································································································· 12
Making coils for transformer ································································································ 13
Test data ································································································································· 14
Wave-form of main experimental units ·················································································· 15
Parameters of thermal resistance and junction temperature ···················································· 19
Dimensional chart of encapsulation························································································ 20

1 page




THX-203H pdf
THX203H
PWM Controller of High-performance Current Mode
Electric Parameter (Ta=25, Vcc=5.5-7.5V, Ct=680PF, RS=1)
Output
Item Testing condition
Maximum pressureIoc=10mA
resistance
of
switching tube
on-saturation pressureIoc=600mA
drop
Output rise-time CL=1nF
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fall-time
limit current
CL=1nF
Tj=0-100
OE clamp voltage OE=0.001-0.60A
Reference
Item Testing condition
Reference outputIo=1.0mA
voltage
power adjustmentVcc=5.5-9V
ratio
Load adjustmentIo=0.1-1.2mA
ratio
Temperature stability
Output noise voltage F=10Hz-10KHz
Long-term stability Operate 1000h under
condition of T=85
Oscillator
Item Testing condition
Oscillating frequency Ct=680PF
Frequency changeVcc=5.5-9V
ratio with voltage
Frequency change rateTa=0-85
with temperature
Vibration amplitude of
oscillator(Vp-p)
Drop edge ofCt=330PF
oscillator
Feedback
Item Testing condition
Pull-up
Input
current
impedance pull-down
resistance
Power supply rejectionVcc=5.5-9V
ratio
Minimum Typical Maximum Unit
700 - -
V
- -1 V
-
- 75
ns
-
- 75
ns
540 580 620 mA
- 1.5 - V
Minimum Typical Maximum Unit
2.4 2.5 2.6 V
-
2 20
mV
- -3 %
- 0.2 - mV/
-
- 50
μV
the- 5 - mV
Minimum Typical Maximum Unit
55 61 67 KHz
- -1 %
- -1 %
- 2.5 - V
- 800 - ns
Minimum Typical Maximum Unit
-
0.50 0.60
mA
- 30 -
K
-
60 70
dB
-5-

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THX-203H arduino
THX203H
PWM Controller of High-performance Current Mode
decreasing when IC over-voltage limit
works.
6. Maximum switching current limit
IC has the function of current limit
cycle by cycle. It will test every
switching current in every switching
cycle, if the current fixed by FB or upper
limit current prevention is reached, it
will come into the close cycle, and the
www.DataSheet4U.comdetection of the current has the function
of real-time foreland hide, it can shield
the switching peak, and avoid the wrong
detection of the switching current. Then
the reasonable temperature compensation
eliminates the influence of temperature,
comparing with normal MOSFET (the
alteration of Ron will be large when the
temperature changes) switching chip, the
switching current can always be very
accurate in a larger range, thus not too
much allowance is needed to match a
larger working temperature range for the
designer when he designs the scenario,
and the security of the circuit for use can
be improved.
The maximum limit value of
switching current for THX203H is 0.80A.
When designing a flyback power with
80V of emitter voltage and 0.65A of
switching current, it can accomplish the
output power of more than 12W easily,
and meet the broad temperature range.
7. Requirement of heat elimination
As for a typical power switch, it must
have necessary heat elimination
measures, so as to avoid that the
excessive heat leads to heat protection.
The primary heat inside IC is produced
by the on-off wasting of the switching
tube, so appropriate heat elimination
position is Pin7-8 pin of IC, one wieldy
way is to pave PCB copper foil of a
certain area on Pin7-8 pin, what’s more,
plating tin on the copper foil will
improve the heat elimination ability
greatly. For an input of 85-265V, the
typical application of 12W output and
200mm2 copper foil are necessary.
Reference wiring is as the following
figure:
Typical application circuit(input 85-265V, output 12V 1A):
- 11 -

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