datasheet

SKHI 21A (R) ...
Absolute Maximum Ratings
Symbol Conditions
Values
Units
%
&)92$
&)2!:
,!:
(
5
8 7/
5
;
=
'
2
2
-%>
=
-.A
'=
!
=
3?
3?,,
C). )#
) #* #!+ 0
& ) +!# #0 %+
) ) !- )
) ) !!+ )
!:0 + ,<)*
(## #!+ !
&?@
3! , ! ,!## , #!+ !*
!* &
#! #!+
) B ) ) ' 0 2(
&
#! #!+
) ) B ) ) ' ' 0 2(
) !+ , 3?
) !+ , 3?,,
!:0 !+ , ) ) !+ )#
!+ !)
/
/
;
B ; 000 8 5=
6
6
A(
D(
+
!+ !)
B ; 000 8 5=
D(
.
SEMIDRIVERTM
Hybrid Dual MOSFET
Driver
SKHI 21A (R)
Features
!"# # $%& '
( !"# )
) "* (
+ ! ,,
#- . "
&
#! "* !
,
) #* )!+
/ #! . ) )
Typical Applications
, )#
"+ )
)
!#
! #!
1)
,+0 1
2)
2 3( 4 5 -67 (( 4 // #&
#'
Characteristics
Symbol Conditions
&
! 4 '= D(7 )#
,
8
B
3
?
?,,
3?
,2&(
&
,,&
333
(
!
( @
) #* #!+ !* ) #* ) !* #!
) #* ) !* !:0
& ) +!# #!+ .,,
& ) # #!+ %+
& ) # #!+ F
& ) !
) +! #!+ ) )
) ,, +! #!+ ) )
&!# +!B !
2
*
+ ,<)*
& )B) ) )B !+! & )B) ) )B,, !+! )B) ) !+! B@ &#- ! 3, #!+ , (B+
() #+ ! !! !* !*
! @ !#) ! 4 ;D(
+
min.
typ.
max.
Units
;7;
=
5
=71
2
2
-6
-6
%>
A
A
A
A
A
1 'E
= . '7=
;7=
75=
75=
8 =
''
5
71
E
;7/
='
'
'7
;=
7=
7=
+
This technical information specifies semiconductor devices but promises no
characteristics. No warranty or guarantee expressed or implied is made regarding
delivery, performance or suitability.
1
30-09-2008 MHW
© by SEMIKRON
SKHI 22 A / B (R) ...
Absolute Maximum Ratings
Symbol Conditions
'
'
Hybrid Dual IGBT Driver
'-
SKHI 22 A / B (R)
2
2
B"+!
!
!!# "
!0
!" "0 ,/ &"!" !
* "
&"!" "
<0 )" >
#
$
" ""
"
"
2"
"
#
" !# " "
" "
!" A "!" , 0 $/
" "
" "
"!" - A "!" , 0 $/
% " 2
% " 2
%<0 " "!" !
!
&!
" "
!
"
"
"
"
!
"
";(
"'<
<
'$(
SEMIDRIVERTM
Features
!"
"
"
""#
$%& !"
!"
" " !"
" # '$(
" )" "
* "! + ""
" # "
!!# "
!"
" ,-. '/
( " + "!"
Typical Applications
" " !! "
1)
0 1
2)
" 2$( 3 -4 *56 $$( 3 ..7 !8
+"
'&
Characteristics
Symbol Conditions
'
&
min.
'$("
$!
%8
)
)
"
'9
'A
2
',/
',/
2(
$
",/&
",/&
",
/
"!(222((
"
Units
-4
' 9 76.
: 9 76.
4
=7
:7
-77
'
'
'
*?
'
:7
*'+@
:77
'
-:77
'
.
.
=-/
A =7 000 9 4:
5
5
@$
C$
A =7 000 9 4:
C$
3 : C$6 "
)
!
!!# "
!# -=6=
!!# " !# , /
!!# " !# ,<0/
!" "
+
+
!" "
"
,/ !" "
"
,E)/ =6:
-6:
!" " "
"
"!"
"
"
"!"
"
"
A
""
" #"
)" >
#
!"A"!" "A !!" "
764:
!"A"!" "A !!" "
764:
( !"A"!" !!" "
( " "
!A" "
* "
*
2
"
'$(A"
$! ! " !# #
%
")
8
3 =7C$
'
Values
typ.
max.
Units
-:
47
-:61
'
'
'
'
'
'
'
*5
*5
'
'
*5
%?
@
@
@
@
@
@
'
!8
-71 D7
-: + 7
:+7
-6:
.6D
-7
.6.
9 -:
AF
4
761
D
=6.
:/
-
67
=:
-6-:
-6-:
=6F
-7
This technical information specifies semiconductor devices but promises no
characteristics. No warranty or guarantee expressed or implied is made regarding
delivery, performance or suitability.
1
30-09-2008 MHW
© by SEMIKRON
SKHI 22 A / B H4 (R) ...
Absolute Maximum Ratings
Symbol Conditions
(
(
Hybrid Dual IGBT Driver
(.
SKHI 22 A / B H4 (R)
4
4
C#,"
"
""$ #
"2
"# #2 -0 '#"# "
+ !
#
'#"# !
#
>2 *#! ?
!$
%
!# ##
#
!
#
4#
#
!$
# "$ # #
# #
"# B #"# - !2 %0
# #
# #
#"# . B #"# - !2 %0
& # 4
& # 4
&>2 # #"# !
"
"
'"
# #
"
#
#
#
#
"
#
#=)
#(>
>
(%)
SEMIDRIVERTM
Features
!"#
#
#
!##$
%&' !"#
"#
# !!# "#
!# $ (%)
# *#! #
!+ #" , ##
# $ #
""$ #
"#
!# -./(0
) #! , #"#
Typical Applications
!!# # ""!#
% #
" # .11 (
1)
2 3
2)
# 4%) 5 /3 +67 %%) 5 81 "97
4 (%) 5 . +6
,#
('
Characteristics
Symbol Conditions
(
'
min.
*
*
#
(B
4
(-0
(-0
4)
%
#-0'
#-0'
#-
0
#")444))
#
(
(
(
+@
(
<1
+(,A
111
(!
.<11
(
/
/
B 1 222 ; :<
6
6
A%
D%
B 1 222 ; :<
D%
5 < D%7 #
*
"
!
(%)#
%"
&9
(;
Units
.:
( ; 17/
< ; 17/
:
1
<1
.811
.0
""$ #
"$ . 7
""$ !
# "$ - 0
""$ !
# "$ ->20
"# #
,
,
"# #
#2 -0 "# #
#2 -F*0 7<
.7<
"# #!
#
#
#"#
#
#
#"#
#
#
B
##
#!
! $#
*#! ?
!$
"#B#"# #B ""# #
17:<
"#B#"# #B ""# #
17:<
) "#B#"# ""# #
) # #
"B# #
2 #
!+
4
!
#
(%)B#
%" !"!#!
"$ !$
&
#*
9
5 1D%
(
Values
typ.
max.
Units
.<
:1
.<73
(
(
(
(
(
(
(
+6
+6
(
(
+6
&@
A
A
A
A
A
A
(
"9
.13 E1
.< , 1
<,1
.7<
/7E
.1
/7/
; .<
B8
:
.
.
173
E
7/
<0
.
71
<
.7.<
.7.<
78
.1
This technical information specifies semiconductor devices but promises no
characteristics. No warranty or guarantee expressed or implied is made regarding
delivery, performance or suitability.
1
30-09-2008 MHW
© by SEMIKRON
External Components
Component
RCE
Function
Reference voltage for VCE-monitoring
10 ⋅ R CE ( kΩ )
V CEstat ( V ) = ------------------------------------ – 1,4
10 + R CE ( kΩ )
with RVCE = 1kΩ (1700V IGBT):
10 ⋅ R CE ( kΩ )
V CEstat ( V ) = ------------------------------------ – 1,8
10 + R CE ( kΩ )
CCE
Recommended Value
10kΩ < RCE < 100kΩ
(1)
(1.1)
CCE < 2,7nF
Inhibit time for VCE - monitoring
15 – V CEstat ( V )
t min = τ CE ⋅ ln ---------------------------------------10 – V CEstat ( V )
10 ⋅ R CE ( kΩ )
τ CE ( μs ) = C CE ( nF ) ⋅ -----------------------------------10 + R CE ( kΩ )
18kΩ for SKM XX 123 (1200V)
36kΩ for SKM XX 173 (1700V)
(2)
0,33nF for SKM XX 123 (1200V)
0,47nF for SKM XX 173 (1700V)
0,5μs < tmin < 10μs
(3)
RVCE
Collector series resistance for 1700V
IGBT-operation
1kΩ / 0,4W
RERROR
Pull-up resistance at error output
1kΩ < RERROR < 10kΩ
U Pull – Up
----------------------- < 15mA
R ERROR
RGON
Turn-on speed of the IGBT 4)
RGON > 3Ω
RGOFF
Turn-off speed of the IGBT 5)
RGOFF > 3Ω
4)
5)
Higher resistance reduces free-wheeling diode peak recovery current, increases IGBT turn-on time.
Higher resistance reduces turn-off peak voltage, increases turn-off time and turn-off power dissipation
© by SEMIKRON 30-09-2008
Driver Electronic – PCB Drivers
2
PIN array
Fig. 2 shows the pin arrays. The input side (primary side) comprises 10 inputs (SKHI 22A / 21A 8 inputs), forming the
interface to the control circuit (see fig.1).
The output side (secondary side) of the hybrid driver shows two symmetrical groups of pins with 4 outputs, each forming
the interface to the power module. All pins are designed for a grid of 2,54 mm.
Primary side PIN array
PIN No. Designation
Explanation
P14
GND / 0V
related earth connection for input signals
P13
VS
+ 15V ± 4% voltage supply
P12
VIN1
switching signal input 1 (TOP switch)
positive 5V logic (for SKHI22A /21A, 15V logic)
P11
free
not wired
P10
/ERROR
error output, low = error; open collector output; max 30V / 15mA
(for SKHI22A /21A, internal 10kΩ pull-up resistor versus VS)
P9
TDT2
signal input for digital adjustment of interlocking time;
SKHI22B: to be switched by bridge to GND (see fig. 3)
SKHI22A /21A: to be switched by bridge to VS
P8
VIN2
switching signal input 2 (BOTTOM switch);
positive 5V logic (for SKHI22A /21A, 15V logic)
P7
GND / 0V
related earth connection for input signals
P6
SELECT
signal input for neutralizing locking function;
to be switched by bridge to GND
P5
TDT1
signal input for digital adjustment of locking time;
to be switched by bridge to GND
ATTENTION: Inputs P6 and P5 are not existing for SKHI 22A/ 21A. The contactor tracks of the digital input signals P5/
P6/ P9 must not be longer than 20 mm to avoid interferences, if no bridges are connected.
Secondary side PIN array
PIN No. Designation Explanation
S20
VCE1
collector output IGBT 1 (TOP switch)
S15
CCE1
reference voltage adjustment with RCE and CCE
S14
GON1
gate 1 RON output
S13
GOFF1
gate 1 ROFF output
S12
E1
emitter output IGBT 1 (TOP switch)
S1
VCE2
collector output IGBT 2 (BOTTOM switch)
S6
CCE2
reference voltage adjustment with RCE and CCE
S7
GON2
gate 2 RON output
S8
GOFF2
gate 2 ROFF output
S9
E2
emitter output IGBT 2 (BOTTOM switch)
ATTENTION: The connector leads to the power module should be as short as possible.
3
Driver Electronic – PCB Drivers
30-09-2008
© by SEMIKRON
© by SEMIKRON 30-09-2008
Driver Electronic – PCB Drivers
4
-input buffer
-short pulse
supression
-pulse shaper
primary side
integrated in ASIC
VS
VS
=
=
=
=
S14
S15
secondary side
Power
driver
over
current
5
4
S9
S8
S7
output
R off
R on
2
output2
(BOTTOM
LOAD
output1
(TOP)
SEMITRANS
IGBT-Module
7
6
S12
1
S1 VCE** RVCE
*
R
S6
CE C CE
Roff
Ron
3
RCE C CE
S20 VCE* * * RVCE
Power
driver S13
over
current
* When SKHI22B is driving 1700V IGBTs, a 1kΩ / 0,4W RVCE-resistor must be connected in series to the VCE input.
** The VCE-terminal is to be connected to the IGBT collector C. If the VCE-monitoring is not used, connect S1 to S9 or S20 to S12 respectively.
*** Terminals P5 and P6 are not existing for SKHI22A/21A; internal pull-up resistor exists in SKHI22A/21A only.
1-7 Connections to SEMITRANS GB-module
input
V
VS
P13 S
-Error memory
input2
(BOTTOM) 6k8/100
ViB
P8
3k2
P7
GND/OV
GND/OV
P14
TDT2 P9
* **
TDT1 P5
-interlock
-deadtime
***
SELECT P6
V
* * * VS
Error P10
-Vs monitor
RERROR
-Error monitor
input1
6k8/100
(TOP) V iT
P12 3k2
Isolation
VCE
E
GOFF
GON
CCE
R2
ERROR
TDT2
V IN2
GND/0V
SELECT
TDT1
CCE
GON
GOFF
E
Date - Code
GND/0V
VS
V IN1
SKHI XX Y
55
±0.2
OUT1
OUT2
VCE
55
±0.2
50.8
detail "A" on scale 10 : 1
0.25x0.5
±0.3
A
±0.5
3.5
16
15
9.5
measured from pin-centre to pin-centre
18.25
3.37
±0.3
15.75
13.53
±0.3
S1
P5
P6
S6
48.26
2.54
22.86
S9
S12
P13
P14
S15
A
A
S20
Fig. 2 Dimension drawing and PIN array (P5 and P6 are not existing for SKHI22A/21A)
5
Driver Electronic – PCB Drivers
30-09-2008
© by SEMIKRON
SEMIDRIVERTM
SKHI 22A / 22B und SKHI 21A
Hybrid dual drivers
The driver generation SKHI 22A/B and SKHI 21A will
replace the hybrid drivers SKHI 21/22 and is suitable for all
available low and medium power range IGBT and
MOSFETs.
The SKHI 22A (SKHI 21A) is a form-, fit- and mostly
function-compatible replacement to its predecessor, the
SKHI 22 (SKHI 21).
The SKHI 22B is recommended for any new development.
It has two additional signal pins on the primary side with
which further functions may be utilized.
The SKHI 22A and SKHI 22B are available with standard
isolation (isolation testing voltage 2500 VAC, 2sec.) as
well as with an increased isolation voltage (type "H4")
(isolation testing voltage 4000 VAC, 2sec.). The SKHI 21A
is only offered with standard isolation features.
Differences SKHI 22-22A (SKHI 21-21A)
Compared to the old SKHI 22/21 the new driver
SKHI 22A / 21A is absolutely compatible with regards to
pins and mostly with regards to functions. It may be
equivalently used in existing PCBs.
The following points have to be considered when
exchanging the drivers:
• Leave out the two resistors RTD for interlocking
dead time adjustment at pin 11 and pin 9.
• The interlocking time of the driver stages in
halfbridge applications is adjusted to 3,25 µs. It may
be increased up to 4,25 µs by applying a 15 V (VS)
supply voltage at Pin 9 (TDT2) (wire bridge)
• The error reset time is typically 9µs.
• The input resistance is 10 kΩ.
As far as the SKHI 22A is concerned, the negative gate
voltage required for turn-off of the IGBT is no longer -15V,
but -7V.
General description
The new driver generation SKHI 22A/B, SKHI 21A
consists of a hybrid component which may directly be
mounted to the PCB.
All devices necessary for driving, voltage supply, error
monitoring and potential separation are integrated in the
driver. In order to adapt the driver to the used power
module, only very few additional wiring may be necessary.
The forward voltage of the IGBT is detected by an
integrated short-circuit protection, which will turn off the
module when a certain threshold is exceeded.
In case of short-circuit or too low supply voltage the
integrated error memory is set and an error signal is
generated.
© by SEMIKRON 30-09-2008
The driver is connected to a controlled + 15 V-supply
voltage. The input signal level is 0/15 V for the SKHI 22A/
21A and 0/5 V for the SKHI 22B.
In the following explanations the whole driver family will be
designated as SKHI 22B. If a special type is referred to,
the concerned driver version will explicitly be named.
Technical explanations1
Description of the circuit block diagram and the
functions of the driver
The block diagram (fig.1) shows the inputs of the driver
(primary side) on the left side and the outputs (secondary
side) on the right.
The following functions are allocated to the primary
side:
Input-Schmitt-trigger, CMOS compatible, positive logic
(input high = IGBT on)
Interlock circuit and deadtime generation of the IGBT
If one IGBT is turned on, the other IGBT of a halfbridge
cannot be switched. Additionally, a digitally adjustable
interlocking time is generated by the driver (see fig. 3),
which has to be longer than the turn-off delay time of the
IGBT. This is to avoid that one IGBT is turned on before
the other one is not completely discharged. This
protec-tion-function may be neutralized by switching the
select input (pin6) (see fig. 3). fig. 3 documents possible
interlock-times. "High" value can be achieved with no
connection and connection to 5 V as well.
P6 ;
SELECT
P5 ;
TDT1
P9 ;
TDT2
interlock time
tTD /μs
open / 5V
GND
GND
1,3
open / 5V
GND
open / 5V
2,3
open / 5V
open / 5V
GND
3,3
open / 5V
open / 5V
open / 5V
4,3
GND
X
X
no interlock
Fig. 3 SKHI 22B - Selection of interlock-times:
„High“-level can be achieved by no connection or
connecting to 5 V
Short pulse suppression
The integrated short pulse suppression avoids very short
switching pulses at the power semiconductor caused by
high-frequency interference pulses at the driver input
signals. Switching pulses shorter than 500 ns are
suppressed and not transmitted to the IGBT.
Power supply monitoring (VS)
A controlled 15 V-supply voltage is applied to the driver. If
it falls below 13 V, an error is monitored and the error
output signal switches to low level.
1.The following descriptions apply to the use of the hybrid
driver for IGBTs as well as for power MOSFETs. For the
reason of shortness, only IGBTs will be mentioned in the
following. The designations "collector" and "emitter" will refer
to IGBTs, whereas for the MOSFETs "drain" and "source" are
to be read instead.
Driver Electronic – PCB Drivers
6
The error memory is set in case of under-voltage or
short-circuit of the IGBTs. In case of short-circuit, an error
signal is transmitted by the VCE-input via the pulse
transformers to the error memory. The error memory will
lock all switching pulses to the IGBTs and trigger the error
output (P10) of the driver. The error output consists of an
open collector transistor, which directs the signal to earth
in case of error. SEMIKRON recommends the user to
provide for a pull-up resistor directly connected to the error
evaluation board and to adapt the error level to the desired
signal voltage this way. The open collector transistor may
be connected to max. 30 V / 15 mA. If several SKHI 22Bs
are used in one device, the error terminals may also be
paralleled.
ATTENTION: Only the SKHI 22A / 21A is equipped with
an internal pull-up resistor of 10 kΩ versus VS. The
SKHI 22B does not contain an internal pull-up resistor.
The error memory may only be reset, if no error is pending
and both cycle signal inputs are set to low for > 9 μs at the
same time.
Pulse transformer set
The transformer set consists of two pulse transformers
one is used bidirectional for turn-on and turn-off signals of
the IGBT and the error feedback between primary and
secondary side, the other one for the DC/DC-converter.
The DC/DC-converter serves as potential-separation and
power supply for the two secondary sides of the driver.
The isolation voltage for the "H4"-type is 4000 VAC and
2500 VAC for all other types.
The secondary side consists of two symmetrical
driver switches integrating the following components:
IGBT is turned off. VCEstat is the steady-state value of VCEref
and is adjusted to the required maximum value for each
IGBT by an external resistor RCE to be connected between
the terminals CCE (S6/S15) and E (S9/S12). It may not
exceed 10 V. The time constant for the delay of VCEref may
be increased by an external capacitor CCE, which is
connected in parallel to RCE. It controls the time tmin which
passes after turn-on of the IGBT before the
VCE-monitoring is activated. This makes possible any
adaptation to the switching behavior of any of the IGBTs.
After tmin has passed, the VCE-monitoring will be triggered
as soon as VCE > VCEref and will turn off the IGBT.
External components and possible adjustments of the hybrid driver
Fig. 1 shows the required external components for
adjustment and adaptation to the power module.
VCE - monitoring adjustment
The external components RCE and CCE are applied for
adjusting the steady-state threshold and the short-circuit
monitoring dynamic. RCE and CCE are connected in
parallel to the terminals CCE (S15/ S6) and E (S12/ S9) .
8
7
6
1200V (min)
5
V CEstat / V
Error monitoring and error memory
1200V (typ)
4
1200V (max)
3
1700V (min)
2
1700V (typ)
1700V (max)
1
0
10
20
30
RCE / kOhm
40
50
Supply voltage
The voltage supply consists of a rectifier, a capacitor, a
voltage controller for - 7 V and + 15 V and a + 10 V
reference voltage.
Gate driver
The output transistors of the power drivers are MOSFETs.
The sources of the MOSFETs are separately connected to
external terminals in order to provide setting of the turn-on
and turn-off speed by the external resistors RON and ROFF.
Do not connect the terminals S7 with S8 and S13 with
S14, respectively. The IGBT is turned on by the driver at +
15 V by RON and turned off at - 7 V by ROFF. RON and ROFF
may not chosen below 3 Ω. In order to ensure locking of
the IGBT even when the driver supply voltage is turned off,
a 22 kΩ-resistor versus the emitter output (E) has been
integrated at output GOFF.
Fig. 4 VCEstat in dependence of RCE (Tamb = 25°C)
Dimensioning of RCE and CCE can be done in three steps:
1. Calculate the maximum forward voltage from the
datasheet of the used IGBT and determine VCEstat
2. Calculate approximate value of RCE according to
equation (1) or (1.1) from VCEstat or determine RCE by
using fig.4.
3. Determine tmin and calculate CCE according to
equations (2) and (3).
Typical values are
for 1200 V IGBT:
RCE = 18 kΩ, CCE = 330 pF
VCE-monitoring
The VCE-monitoring controls the collector-emitter voltage
VCE of the IGBT during its on-state. VCE is internally limited
to 10 V. If the reference voltage VCEref is exceeded, the
IGBT will be switched off and an error is indicated. The
reference voltage VCEref may dynamically be adapted to
the IGBTs switching behaviour. Immediately after turn-on
of the IGBT, a higher value is effective than in the steady
state. This value will, however, be reset, when the
7
Driver Electronic – PCB Drivers
VCEstat = 5 V; tmin = 1,45 μs,
for 1700 V IGBT:
VCEstat = 6 V; tmin = 3 μs,
RCE = 36 kΩ, CCE = 470 pF
Adaptation to 1700 V IGBT
When using 1700 V IGBTs it is necessary to connect a
1 kΩ / 0,4 W adaptation resistor between the VCE-terminal
(S20/ S1) and the respective collector.
30-09-2008
© by SEMIKRON
Adaptation to error signal level
An open collector transistor is used as error terminal,
which, in case of error, leads the signal to earth. The signal
has to be adapted to the evaluation circuit's voltage level
by means of an externally connected pull-up resistor. The
maximum load applied to the transistor shall be 30 V / 15
mA.
As for the SKHI 22A / 21A a 10 kΩ pull-up resistor versus
VS (P13) has already been integrated in the driver.
IGBT switching speed adjustment
The IGBT switching speed may be adjusted by the
resistors RON and ROFF. By increasing RON the turn-on
speed will decrease. The reverse peak current of the
free-wheeling
diode
will
diminish.
SEMIKRON
recommends to adjust RON to a level that will keep the
turn-on delay time td(on) of the IGBT < 1 μs.
By increasing ROFF the turn-off speed of the IGBT will
decrease. The inductive peak overvoltage during turn-off
will diminish.
The minimum gate resistor value for ROFF and RON is 3 Ω.
Typical values for RON and ROFF recommended by
SEMIKRON are given in fig. 5
RGon
Ω
RGoff
Ω
CCE
pF
RCE
kΩ
RVCE
kΩ
SKM 50GB123D
22
22
330
18
0
SKM 75GB123D
22
22
330
18
0
SKM 100GB123D
15
15
330
18
0
SKM 145GB123D
12
12
330
18
0
SKM 150GB123D
12
12
330
18
0
SKM 200GB123D
10
10
330
18
0
SKM 300GB123D
8,2
8,2
330
18
0
SKM 400GA123D
6,8
6,8
330
18
0
SKM 75GB173D
15
15
470
36
1
SKM 100GB173D
12
12
470
36
1
SKM 150GB173D
10
10
470
36
1
SKM 200GB173D
8,2
8,2
470
36
1
SK-IGBT-Modul
SEMIKRON recommends to start-up operation using the
values recommended by SEMIKRON and to optimize the
values gradually according to the IGBT switching
behaviour and overvoltage peaks within the specific
circuitry.
Driver performance and application limits
The drivers are designed for application with halfbridges
and single modules with a maximum gate charge QGE <
4 μC (see fig. 6).
The charge necessary to switch the IGBT is mainly
depending on the IGBT's chip size, the DC-link voltage
and the gate voltage.
This correlation is also shown in the corresponding
module datasheet curves.
It should, however, be considered that the SKHI 22B is
turned on at + 15 V and turned off at - 7 V. Therefore, the
gate voltage will change by 22 V during every switching
procedure.
Unfortunately, most datasheets do not indicate negative
gate voltages. In order to determine the required charge,
the upper leg of the charge curve may be prolonged to
+ 22 V for determination of approximate charge per
switch.
The medium output current of the driver is determined by
the switching frequency and the gate charge. For the SKHI
22B the maximum medium output current is IoutAVmax < ±
40 mA.
The maximum switching frequency fMAX may be calculated
with the following formula, the maximum value however
being 50 kHz due to switching reasons:
4
4 ⋅ 10
f MAX ( kHz ) = ----------------------Q GE ( nC )
Fig. 6 shows the maximum rating for the output charge per
pulse for different gate resistors.
SKHI 22 A/B maximum rating for output charge per
pulse
4,50
4,00
Fig. 5 Typical values for external components
Fig. 3 shows the possible interlocking times between
output1 and output2. Interlocking times are adjusted by
connecting the terminals TDT1 (P5), TDT2 (P9) and
SELECT (P6) either to earth/ GND (P7 and P14)
according to the required function or by leaving them
open.
A typical interlocking time value is 3,25 μs (P9 = GND; P5
and P6 open). For SKHI 22A / 21A the terminals TDT1
(P5) and SELECT (P6) are not existing. The interlocking
time has been fixed to 3,25 μs and may only be increased
to 4,25 μs by connecting TDT2 (P9) to VS (P13).
ATTENTION: If the terminals TDT1 (P5), TDT2 (P9) and
SELECT (P6) are not connected, eventually connected
track on PC-board may not be longer than 20 mm in order
to avoid interferences.
© by SEMIKRON 30-09-2008
Rg=24 OHM; 3,86µC
3,00
Q / µC
Interlocking time adjustment
3,50
Rg=18 OHM; 3,52µC
2,50
Rg=12 OHM; 3,07µC
2,00
1,50
Rg=6 OHM, 2,50µC
1,00
Rg=3 OHM, 2,18µC
0,50
0,00
0
10
20
30
40
50
60
f / kHz
Fig. 6 Maximum rating for output charge per pulse
Further application notes
The CMOS-inputs of the hybrid driver are extremely
sensitive to over-voltage. Voltages higher than VS
+ 0,3 V or below – 0,3 V may destroy these inputs.
Therefore, control signal over-voltages exceeding the
above values have to be avoided.
Please provide for static discharge protection during
handling. As long as the hybrid driver is not completely
assembled, the input terminals have to be short-circuited.
Driver Electronic – PCB Drivers
8
Persons working with CMOS-devices have to wear a
grounded bracelet. Any synthetic floor coverings must not
be statically chargeable. Even during transportation the
input terminals have to be short-circuited using, for
example, conductive rubber. Worktables have to be
grounded. The same safety requirements apply to
MOSFET- and IGBT-modules!
The connecting leads between hybrid driver and the
power module should be as short as possible, the driver
leads should be twisted.
Any parasitic inductances within the DC-link have to be
minimized. Over-voltages may be absorbed by C- or
RCD-snubbers between the main terminals for PLUS and
MINUS of the power module.
When first operating a newly developed circuit,
SEMIKRON recommends to apply low collector voltage
and load current in the beginning and to increase these
values gradually, observing the turn-off behaviour of the
free-wheeling diode and the turn-off voltage spikes
generated accross the IGBT. An oscillographic control will
be necessary. In addition to that the case temperature of
the module has to be monitored. When the circuit works
correctly under rated operation conditions, short-circuit
testing may be done, starting again with low collector
voltage.
It is important to feed any errors back to the control circuit
and to switch off the device immediately in such events.
Repeated turn-on of the IGBT into a short circuit with a
high frequency may destroy the device.
Mechanical fixing on PCB:
In applications with mechanical vibrations do not use a
ty-rap for fixing the driver, but - after soldering and testing
- apply special glue. Recommended types: CIBA GEIGY
XP 5090 + 5091; PACTAN 5011; WACKER A33 (ivory) or
N199 (transparent), applied around the case edge (forms
a concave mould). The housing may not be pressed on the
PCB; do not twist the PCB with the driver soldered on,
otherwise the internal ceramics may crack. The driver is
not suitable for big PCBs.
Proven, within the scope of the product qualification, was
the use of the driver with the printed circuit board
SKPC 2006 ( L x B x H = 97,0 x 67,5 x 1,5 mm). During the
test, the driver was stuck with glue on the printed circuit
board. Based on this information the technical conclusion
arises, that in an application with big printed circuit boards,
this board must be supported and reinforced in the area of
the driver.
If a PCB is directly plugged to IGBT modules, the PCB has
to be fixed to the heat sink by thread bolts.
The temperature of the solder must not exceed 265°C,
and solder time must not exceed 4 seconds. The ambient
temperature must not exceed the specified maximum
storage temperature of the driver.
The driver is not suited for hot air reflow or infrared reflow
soldering processes.
Storage hints
- Store driver only in original packaging.
- Avoid contamination of driver's surface during storage,
handling and processing.
- Please use the driver within one year after driver
manufacturing date. The manufacturing date is marked on
the driver. Usage of the driver beyond this shelf life could
compromise product long term reliability.
- Further storage conditions are indicated in the data
sheet
Environmental conditions
The driver is type tested under the environmental
conditions below.
Thermal cycling test:
- 100 cycle -40°C … +85°C
Vibration test according DIN IEC 68-2-6:
- Sinusoidal sweep: 10 Hz … 100 Hz
-1 Octave / min.
-Acceleration: 1,5 g
-Axes: 3 (x, y, z)
-26 sweeps per axis
-Driver soldered on board SKPC 2006 (L x B x H = 97,0
x 67,5 x 1,5mm)
-Driver stuck with glue on printed circuit board (see
application notes)
Shock test according DIN IEC 68-2-27:
- Half-sinusoidal pulse
-Peak acceleration: 5 g
-Shock width: 18ms
-3 shocks in each direction (±x, ±y und ±z)
-18 shocks in total
-Driver soldered on board SKPC 2006 (L x B x H = 97,0
x 67,5 x 1,5mm)
-Driver stuck with glue on printed circuit board (see
application notes)
9
Driver Electronic – PCB Drivers
30-09-2008
© by SEMIKRON
Temperature humidity according IEC 60068-1 (climate):
- 40/085/56 (40°C, 85% RH, 56h)
- No condensation, no dripping water, non- corrosive
Climate class 3K3
All electrical and mechanical parameters should be
validated by user´s technical experts for each application.
For further details please contact SEMIKRON.
This technical information specifies devices but promises no characteristics. No warranty or guarantee expressed or implied is made
regarding delivery, performance or suitability.
© by SEMIKRON 30-09-2008
Driver Electronic – PCB Drivers
10