PG: 6.078 sh1 12/1/98
100
1000
10000
0
1
2
3
4
5
6
7
8
C770
ON-STATE CHARACTERISTIC
On-state current , It (amperes)
On-state Voltage , Vt (volts)
On-state Voltage , Vt (volts)
Process Maximum
Pulsed Current
Initial Tj = 125 degC
0.1
1
10
100
1000
10000
THERMAL IMPEDANCE vs. ON-TIME
Zthj-c (deg C/W)
On-Time (milliseconds)
On-Time (milliseconds)
Rthj-case(dc) =
.012 degC/watt
.01
.001
.0001
.00001
.02
1
10
C770
Non-Repetitive Half-Cycle
Peak Surge Current & I2t
Itsm (kA)
Pulse Width - milliseconds
I2t (amp-sq-sec)
Pulse Width - milliseconds
5.E6
10.E6
1.E6
10
50
100
175 GREAT VALLEY PARKWAY, MALVERN, PA 19355
U S A
Type C770 reverse blocking thyristor is suitable for inverter applications.The silicon junction
is manufactured by the proven multi-diffusion process and utilizes the exclusive involute gate
structure.It is supplied in an industry accepted disc-type package , ready to mount using
commercially available heat dissipators and mechanical clamping hardware.
INVERTER THYRISTO R
C770 & C770A
77mm / 1800V / 60-80us
Blocking Voltage Code
C770__
C770A__
V
D R M
/V
R R M
M O D E L
-40 to +125
o
C
-- -- -- -- -- -- -- -- -- -- -- -
C770 PN
1800 Volts
C770 PS
1700
C770 PM
1600
C770 PE
1500
C770 PD
1400
Gate Drive Requirements:
open circuit voltage
30-40 V
internal impedance
10
rise time of s.s. current
0.5 - 1
s
minimum duration
10
s
C770
PG:6.078 Sh 2
DATE: 12/1/98
1
10
100
3000
3500
4000
4500
5000
5500
6000
6500
7000
ENERGY LOSS PULSE / C770 THYRISTOR
Half sine pulses / No reverse loss
Energy per Pulse (joules)
Peak Current (amperes)
Peak Current (amperes)
SIGC770A/89C
9000
7000
5000
2000
1000
750
500
250
pulse width
(us)
1
10
100
3000
3500
4000
4500
5000
5500
6000
6500
7000
ENERGY PER PULSE
Trapezoidal Wave - no reverse voltage
di/dt = 100 A/us
Energy per Pulse (joules)
Peak Current, It (amperes)
Peak Current, It (amperes)
C770TR1/91a 2/7/91
1000
9000
7000
5000
2000
750
500
250
pulse width
(us)
SELECTED RECOVERY TESTS
Turn-off Time
@ Tj = 125
o
C
- LEM Thyristometre
Type C770
conditions for Tq <= 80us
di
R
dt = 25 A/us
V
R
= - 5V
400V/us to 67%V
DRM
- Naturally Commutating Circuit
type C770A only
conditions for Tq <= 60us
It = 3000 A
di
R
dt = 60 A/us
80 - 100V/us initial
Vd = 1000V
- Naturally Commutating Circuit
type C770A only
conditions :
di
R
dt = 60 A/us
V
R-appl'd
=350V
snubber R=60
C= 1
F
I
RM
<= 400A
Q
RR
<= 2000
C
S = t
b
/t
a
>= 0.33
LIMITING CHARCTERISTICS
C770
TEST
PARAMETER
SYMBOL
CONDITIONS
LIMIT
UNITS
Rep. peak rev.
V
RRM
Tj = -40 to +125
o
C
up to
V
& off-state volts
V
DRM
1800
Reverse & off-
I
RRM
Tj = 125
o
C
100
ma
state current
I
DRM
Average on-state
I
T(AV)
T
CASE
= 70
o
C
2100
A
current
Non-rep. half cycle
I
TSM
60 Hz (8.3ms)
38
kA
surge current
50 Hz (10 ms)
35
On-state voltage
V
TM
I
T
= 2000A
1.55
V
special C770A
1.60
T
CASE
= 125
o
C
Critical rate of rise
di/dt
(rep)
Tj=125
o
C 60Hz
300
A/us
of on-state current
Critical rate of rise
dv/dt
Tj=125
o
C 60Hz
500
V/us
of off-state voltage
linear
V
DCRIT
=67%V
DRM
Recovery current
I
RM
Tj=125
o
C
200
A
@ 25 A/us
Turn-on delay
t
d
V
D
=67%V
DRM
2
us
Thermal resistance R
thJ-C
.012
o
C/watt
C770 only
C770 only
C770
PG:6.078 Sh 3
DATE: 12/1/98
MOUNTING PRESSPAKS TO HEAT DISSIPATORS
The following instruction is essential for maintaining low,
stable thermal and electrical resistances associated with
the PRESSPAK to heat dissipator surfaces.
1. INSPECTION OF MATING SURFACES
Check each mating surface for nicks,scratches and surface
finish.The PRESSPAK surface has a total indicator reading
TIR < .0005 inch and surface finish 32 prior to factory
electrical test in pressure fixtures. The dissipator
surface should be equally as good.The TIR of a fully
tested PRESSPAK may run higher but not exceed 0.001
inch (**) not including some minor nicks and scratches
associated with the test fixtures. Any bow created by
clamp system at assembly must keep flatness within 0.001
inch.(**)
(**) .002 inch for 77mm PRESSPAKS
2. SURFACE DEOXIDATION AND CLEANING
Although plated surfaces are recommended for aluminum and
copper heat dissipators, bare surfaces may be used if
careful attention to cleaning and treating is assured.
Plated surfaces and PRESSPAKS should be lightly sanded
with 600 grit paper, then oil or compound applied as
recommended. Unplated aluminum surfaces should be
vigorously abraided with a fine wire brush or 3M
"Scotchbrite" coated with Alcoa EJC #2 compound. The EJC
# 2 should be removed and the recommended compound
applied.
3. FINAL SURFACE TREATMENT
Apply silicone oil or a very thin layer of grease or
compound as indicated below. Rotate the PRESSPAK to
properly distribute the applied agent.
. bare copper
- use G322L or LS2037
. bare aluminum - use EJC #2 or G322L
. tin plated copper or aluminum
- preferably reapply DC550 or SF1154
- alternatively use G623 or G322L
. nickel plated aluminum - use DC550,G623 or G322L
. silver plating - not recommended
Recommended silicone oils are SF1154 or DC550
(200 centistoke)
4. MOUNTING
Assemble with specified mounting force applied through a
self-leveling swivel connection. The diameter of the
swivel should be preferably equal but not smaller than
the poleface diameter of the PRESSPAK. Center holes on
the top and bottom of the PRESSPAK are for locating and
positioning it to identical holes anticipated at the
heat dissipator surfaces using 1/8"dia 3/16" roll pins.
NOTES:
Silicone oil DC550 (200 centistoke) is a
product of DOW CORNING; clear silicone grease
G623, yellow G322L and SF1154(200 centistoke)
GE Silicones Waterford NY; EJC# 2 from ALCOA
and black LS2037 from ARCO , 7301 Bessemer Ave.
Cleveland OH.
Limit maximum joint temperature to:
-
95 C using EJC #2
-
150 C using SF1154,DC550 or G322L
5. APPLIED MOUNTING FORCE
The selection of an appropriate commercially available
spring clamping hardware* should consider eatablishing
and maintaining the specified mounting force over the
operating temperature range and operating life of the
PRESSPAK.Thus essential ratings such as thermal resit-
ance ,di/dt,surge current and thermal cycling will not
be impaired.
Specified forces for this product are as
follows:
7000-9000 lbs.
31.1 -40.0 kN
* Consult factory for recommendations or more detailed
instructions.
B
B
A
2 0 5
D
CL
CL
J
A
A
A
A
A
= 4.35 in (110.5 mm)
= 4.35 in (110.5 mm)
= 4.35 in (110.5 mm)
= 4.35 in (110.5 mm)
= 4.35 in (110.5 mm)
B
B
B
B
B
= 2.88 in (73.2 mm)
= 2.88 in (73.2 mm)
= 2.88 in (73.2 mm)
= 2.88 in (73.2 mm)
= 2.88 in (73.2 mm)
D= 1.45 in (36.8 mm)
D= 1.45 in (36.8 mm)
D= 1.45 in (36.8 mm)
D= 1.45 in (36.8 mm)
D= 1.45 in (36.8 mm)
MECHANICAL OUTLINE
MECHANICAL OUTLINE
MECHANICAL OUTLINE
MECHANICAL OUTLINE
MECHANICAL OUTLINE
External Clamping Force
8000 - 9000 lbs.
35.6 - 40 kN
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