datasheet

SKHI 61 (R) ...
Absolute Maximum Ratings
Symbol Conditions
Values
Units
9
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SEMIDRIVERTM
Sixpack IGBT and
MOSFET Driver
SKHI 61 (R)
*
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Features
Characteristics
Symbol Conditions
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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
25-05-2007 MHW
© by SEMIKRON
SKHI 71 (R) ...
Absolute Maximum Ratings
Symbol Conditions
Values
Units
9
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SKHI 71 (R)
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Preliminary Data
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SEMIDRIVERTM
Sevenpack IGBT and
MOSFET Driver
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Features
Characteristics
Symbol Conditions
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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
25-05-2007 MHW
© by SEMIKRON
PIN array
Primary side PIN array
Pin
Symbol Function
Pin
Symbol
Function
01
BS
Auxiliary earth connection
11
+15V
Supply voltage
02
BOT3
Driver signal BOT HB3
12
+15V
Supply voltage
03
TOP3
Driver signal TOP HB3
13
TDT1
Deadtime bit #1
04
BOT2
Driver signal BOT HB2
14
TDT2
Deadtime bit #2
05
TOP2
Driver signal TOP HB2
15
SEL
Deadtime on/off
06
BOT1
Driver signal BOT HB1
16
BSTD
Aux. earth for deadtime adjustment
07
TOP1
Driver signal TOP HB1
17
_ERRIN
_External error signal input
08
_ERR
_Error output Sixpack-driver
18
NC
reserved
09
BSS
System earth connection
19
BRK
Driver signal additional switch
10
BSS
System earth connection
20
_BERR
_Error output additional switch
connection primary side
connection secondary side
Fig. 1 Bottom view of the SKHI 61 / SKHI 71
Secondary side PIN array
Pin
Symbol Function
Pin
Symbol Function
01
RGate
Gate resistor input
04
VCET 2
VCE-threshold #2
02
VCET 1
VCE-threshold #1
03
E
Emitter input
09
VCE
Collector input
2
Driver Electronic – PCB Drivers
25-05-2007
© by SEMIKRON
SEMIDRIVERTM
Error output signals
SKHI 61 and SKHI 71
i) 6pack - driver
General properties and functions
The error signal of the 6-PACK driver is equipped with an
active push-pull output buffer which switches towards zero
Volt in case of an error and actively towards + 5 V under
operating conditions. The error memory may only be
reset, if no error is pending and all cycle signal inputs are
set to LOW for t > 9 µs at the same time. If any other
external signals are intended to be connected to the error
signal _ERR, the _ERR-signal must be uncoupled (see
Figure 2)
.
The SKHI 61 and SKHI 71 are 6- and 7-channel drivers for
IGBT- and MOSFET-modules and can be soldered
directly onto the PCB. The drivers are physically
separated.
Since all subassemblies necessary for operation have
been integrated, there is no need for external components
except for the gate resistors and the VCE-circuitry.
VCE-thresholds and the blanking time are adjustable by
integrating additional resistors and capacitors according to
the customer's specifications.
Interlocking time can be adjusted by simple bridging of
connector pins. The driver is equipped with a separate
error input for immediate turn-off when receiving error
signals
from
external
components
(e.g.
over-temperature).
The independent seventh driver channel of the SKHI 71
guarantees for simple realisation of brake chopper, boost
converter or PFC-circuit applications. By bridging of
connector pins the driver error signal is transmitted directly
to the SIXPACK-driver for turn-off.
Technical information
Fig. 2 _ERR-Signal in an „open-collector“-circuit
I. Primary side
The driver input signals may be transmitted directly to the
driver inputs by the controller. The input signal circuit was
designed to accept a wide voltage range (see table 1). The
typical voltage level is at HCMOS level of VDD=5V
(0V=Off, +5V=On).
State
Level / V
_ERROR
Error
However, also 15V-signals may be applied with the same
turn-on/turn-off
thresholds
without
additional
requirements. In this case the input resistance will be
different (see table 1).
No error
Status
Level / V
min
typ
I / mA
Typical error memory
set back time
max
max
6-PACK
seventh
driver
0
0.8
5
16µs
7µs
4
5
5
min
Table 2: Error output signal ratings
Input Impedance
max
Ch. 1-6
Ch7
ON 5V
4,0
5,0
5,5
60 kΩ
2,4 kΩ
ON 15V
4,0
15,0
15,6
7 kΩ
1,6 kΩ
OFF 0V
-0,7
0
1,5
60 kΩ
2,4kΩ
Table 1: Input voltage level and input impedances
Error input signal
The error input signal can gather error signals of other
hardware components, such as temperature sensors, in a
"wired-or"-connection for direct turn-off of the driver. In this
case an external pull-up resistor must not be connected.
Note: It is not possible to connect the error output of the
SKHI 61/71 to an error input of the SKHI 61/71. But the
error output of the chopper driver (SKHI 71) can be
connected directly to the error input.
© by SEMIKRON 25-05-2007
ii) chopper driver (only SKHI 71)
The error output signal of the additional driver has been
designed as an open collector output. A pull-up resistor
against the controller's +VCC has to be connected to the
controller input for error indication. In case of error, the
signal is turned towards earth (zero Volt/ active LOW),
otherwise the output will be highly resistive. The error
signal of the additional switch will only be active as long as
the input signal is on High-level. It is not logically
connected to the other six input signals. The error signal
of the additional switch may also be directly connected to
the error input of the SIXPACK-driver, without requiring an
external pull-up resistor. This may be advantageous, if the
SIXPACK-driver has to be turned off in case of e.g. a
brake chopper error or if only one error signal is evaluated
by the controller.
Driver Electronic – PCB Drivers
3
Configuration pins
The configuration pins serve to adjust the TOP/BOTTOM
interlocking time of all halfbridges. Due to the special pin
design the interlocking time can be adjusted by a simple
connection to the BSTD terminal (BSS potential) on the
PCB without requiring external components.
2 µs
1 µs
no
inter-loc
k )+
open
GND
GND
X
GND
open
GND
X
open
open
open
GND
Pin
4µs
3 µs
(factory set)
TDT1
open
TDT2
open
SEL
open
t blank [ µs ] ⋅ ( 72,75 + R VCE [ kΩ ] )
– 0,1
C VCE [ nF ] = --------------------------------------------------------------------------------( R V CE [ kΩ ] + 4,75 ) ⋅ 36,08
Equation 2
The VCE-threshold cannot be increased, so that the preset
value of 5,8 V is the maximum value.
VCE-monitoring can also be suppressed by connecting the
collector pin VCE of one driver to the belonging emitter pin
E and not to the collector of the power semiconductor.
5V
Table 3: Values for interlocking time adjustment „X“ = no
effect
)+ TOP and BOTcan be switched simultaneously!
Equation 1
11, 86
R VCE [ kΩ ] = ------------------------------------- – 4,75
5, 4 – 0,93 V CE
TOP
0V
5V
t pERRESET
BOT
0V
5V
Error
t dERR
t dIO
0V
14,9V
II. Secondary side
We have provided for five terminals per input. Two of them
are required for driving the IGBT, one is for short-circuit
protection. The remaining two have been designed for
optional adjustment of the VCE-threshold.
0V
Vce- ERROR
with Soft
Turn Off
t TD
TOP
-6,5V
Gate- Emitter
14,9V
tblank+0,3us t soft turn off
BOT
0V
t>t
Gate- Emitter
IGBT-driver signals
TD
-6,5V
We have provided for one gate- and one emitter input pin
per power switch, i.e. there is one gate resistor for turn-on
and turn-off each. The earth connection of the driver is
directly connected to the IGBT's emitter via the emitter
input, whereas a resistor of at least 10 Ω has to be
connected to the gate circuit. This resistance is the
minimum limit value controlled by the driver output buffer
in order to limit the pulse currents to their peak value.
Fig. 3 Course diagram: TOP and BOT-inputs and signal
Error compared to TOP and
BOT-Gate-Emitter-signal (valid for all halfbridges).
A 20 kΩ-resistor has been interconnected between gate
and emitter (for the case that the supply voltage breaks
down).
Gate-Emitter-voltage min
Typ
max
Unit
OFF (neg.)
-10
-6.5
-5
V
ON
14,4
14,9
15,4
V
Temperature drift
12
14
16
mV/K
Table 4: Gate-emitter-voltage at TA = 25 °C
Fig. 4 Connection principle of a power switch with a
specifically adjusted V CE-threshold
VCE -threshold and VCE -monitoring
VCE-monitoring is done by connection of the driver
collector pin to the collector of the power semiconductor.
This can be done by attaching a capacitor (value to be
calculated by equation 2) between VCE-threshold (pin 2)
and earth (pin 3). The VCE-threshold may be adjusted to a
minimum value of about 3 V (RVCE = 0 Ω).
50 kHz
switching frequency
If the turn-off threshold for short-circuit protection is to be
reduced (standard 5,8 V), a resistor has to be connected
between the VCET1-threshold#1 pin 2 and VCET2threshold#2 pin 4 (see fig. 4; Value to be calculated by
equation 1). Please do not forget to adapt the blanking
time1 accordingly.
60 kHz
40 kHz
30 kHz
Ta = 85°C
20 kHz
Ta = 55°C
10 kHz
0 kHz
0,0 µC
0,1 µC
0,2 µC
0,3 µC
0,4 µC
0,5 µC
0,6 µC
0,7 µC
0,8 µC
0,9 µC
1,0 µC
1,1 µC
1,2 µC
gate charge
1. Blanking time: time between turn-on
semiconductor and V CE-registration
4
of
Driver Electronic – PCB Drivers
the
power
Fig. 5 Maximum rating for output gate charge per pulse
25-05-2007
© by SEMIKRON
• VCE-threshold : 4,8 V
• Interlocking time : 2 µs
• Error blanking time for VCE-threshold : 4 µs
15
Application Hints
To adjust different VCE thresholds there is needed an
additional resistor RVCE and a capacitor C VCE for each
switch.
Fig. 6 Maximum cycling frequency at QGE = 1000 nC vs
temperature
The application range can be calculated by the average
output current of 20 mA and the repetetive acceptable
peak current of 2 A. It has to be considered that the curves
are valid for Qgmax = 1 µC only.
The maximum switching frequency fmax may be calculated
with the following formula, the maximum value however
being 50 kHz due to switching reasons:
Gate resistor :
RG = 33 Ω
VCE-threshold resistor:
intended UVCE = 4,8 V
Applying equation 1 RVCE will result in
11,86 - – 4,75[kΩ ] = 7,9kΩ
R VCE [ kΩ ] = ---------------------------------5,4 - 0,93 ⋅ 4,8
fmax (kHz) = 2*104 / QGE (nC)
Next value taken from the E24-range: 8,25 k. The
threshold voltage is recalculated with 8,25 kΩ.
operating the SKHI 61: besides the operating voltage only
the six driver signals TOP1...BOT3 and the driver error
output signal are connected to the controller on the
primary side. The secondary side is working with the
preset VCE-threshold of 5,8 V.
VCE-threshold at 4,82 V.
Fig. 7 and 8 show examples for connection of a SKHI 71
for the application with MiniSKiiP (SKiiP 32 NAB 12) and
the following adjustments:
• Temperature monitoring of the power semiconductor
For the capacitor the blanking time may be calculated as:
tblanking = 4 µs
4 ⋅ ( 72,75 + 8,25 )
C V CE [ nF ] = -------------------------------------------------- – 0,1 = 590pF
( 8,25 + 4,75 ) ⋅ 36,08
Thus there can be chosen a capacitor of 680 pF.
Fig. 7 SKHI 61 block diagram
© by SEMIKRON 25-05-2007
Driver Electronic – PCB Drivers
5
Fig. 8 Examply circuit for a SKHI 71 connected to the primary side
NOTE: If the _ErrorOut-signal of the additional switch (here brake chopper) is also needed for other evaluations, a
Schottky diode has to be connected as shown in the figure above to uncouple the signal. Furthermore there has to be
connected a pull-up resistor to the additional error output. It is useful to use a capacitor (typ. 100 pF, absolute maximum
2,2 nF) at the _ErrorIn to avoid undesired couplings.
Fig. 9 Dimensional drawing, layout
View: tooling side (top view, driver put on top of the PCB)
Measurements taken in [mm]
Grid of connector pins; gaps between pins: RM2,54
Pin dimensions : 0,64 mm x 0,64 mm ; length 3,2 mm
6
Driver Electronic – PCB Drivers
25-05-2007
© by SEMIKRON
Fig. 10 Measurements in [mm] for solder pads (as a proposal for the design) and solder pad gaps (partial drawing)
Mounting Hints
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.
The driver hast two drill holes (inner diameter: 1,8mm) for fixing the driver on PCB with self tapping screws 30x8
(e.g. EJOT PT). The maximum immersion depth of the screws may not exceed 9 mm. The details of screw head design
can be chosen by the user.
All electrical and mechanical parameters should be validated by user´s technical experts for each application.
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 25-05-2007
Driver Electronic – PCB Drivers
7