AN-7508 Datasheet, PDF (1/2 Pages) Fairchild Semiconductor – HVIC/IGBT Half-Bridge Converter Evaluation Circuit

Application Note
HVIC/IGBT Half-Bridge Converter
Evaluation Circuit
May 1992
AN-7508
Author: George Danz
/Title
AN75
8)
Sub-
ect
HVIC
IGBT
alf-
ridge
on-
erter
valu-
tion
ir-
uit)
Autho
()
Key-
ords
)
Cre-
tor ()
DOC
NFO
df-
ark
Page-
ode
Use-
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ine
DOC-
IEW
df-
ark
The HVIC high voltage integrated circuit is designed to drive
n-channel IGBTs or MOSFETs in a half-bridge configuration
up to 500V_DC. Power supply and motor control inverters can
be configured for voltages up to 230V_AC using the HVIC,
IGBTs and a few other components.
A few precautions should be taken in using the circuit. Lead
lengths between the external power circuit (including gate
and pilot leads), the 15V bypass capacitor (C_DD), the boot-
strap diode (D_F) and capacitor (C_F) and the HVIC should be
minimized.
The basic components required to evaluate the features of
the SP601 are shown in the simplified schematic. The rec-
ommended load is largely resistive so that the largest current
component will flow through the IGBTs, IGT1 and IGT2.
The flyback diodes, D1 and D2, rated 8A, will carry a much
smaller flyback current component. A small amount of load
inductance will cause the switching waveforms to simulate
the conditions which would normally be observed with motor
or transformer loads, while limiting the current carried by the
lower rated flyback diodes in this circuit.
The values for R_PUa, R_PUb, etc., have been chosen to result
in overcurrent trip at approximately 25Apk. At this level of
current, heat sinking for the IGTs and flyback diodes is
required. The series resistance of the upper and lower pilot
resistor dividers would be approximately 1KΩ; the divider
ratio should cause 0.1V at the tap at the desired trip current.
When first energizing your evaluation circuit, begin with a
reduced bus voltage of about 20V_DC to 30V_DC to verify
proper circuit operation before proceeding to higher voltages.
More specific information can be found in File Number 2428
and File Number 2429 Half-Bridge 500V_DC Driver data
sheets and in the Application Note, AN-8829.1.
Simplified Schematic
D_F
+
15V
PULSE
GEN
+15V
FAULT
LED
+15V
V_DF
V_BIAS
VBS
D1U
G1U
G2U
50Ω
100Ω
PHASE
UP/DOWN
V_OUT
TRIPU
FAULT
HVIC
ENABLE
CL2
D1L
G1L ^50Ω
G2L ^100Ω
CL1
V_DD
V_SS TRIPL
IGT1
0.22 ⁺
C_F
R_PBa
25_VDC ≤ V_LINK 3 500V_DC
D1
R_PUb
IGT2
C1
D2
R_PLa
R_PLb
C_DD ≤ 10µF
V_LINK
+
2
R_L
20Ω
3KW
L_L
1mH
+
V_LINK
2
HVIC - Fairchild Part # SP601 (Formerly
GS601)
IGT1, 2 - Fairchild Part # HGTA24N60D1C
D1, 2 - Fairchild Part #
RUR860
D_F - Fairchild Part # A114M
R_PUa, R_PLa - 910Ω, 1.8W
R_PUb, R_PLb - 68Ω, 1.8W
C1 - 0.1µF, 600V_DC
R_L - 20Ω, 3KW 13 -50
©2002 Fairchild Semiconductor Corporation
Application Note Rev. A1