dm00097095

AN4373
Application note
Galvanically-isolated 8 channel high-side driver
based on the ISO8200B
By Massimo Oteri
Introduction
The STEVAL-IFP015V2 product evaluation board works in combination with the STEVALPCC009V2 interface board to allow evaluation of all the features of the ISO8200B device. A
large GND area on the printed circuit board has been designed to minimize noise effects
and ensure good thermal performance.
The ISO8200B is a galvanic isolated 8 channel driver featuring a very low supply current. It
contains 2 independent galvanic isolated voltage domains (VCC for the power stage and
VDD for the digital stage). The IC is intended to drive any type of load with one side
connected to ground. Active channel current limitation combined with thermal shutdown,
independent for each channel, and automatic restart protect the device against overload.
Additional embedded functions are: loss of GND protection which automatically turns off the
outputs in case of analog ground, undervoltage shutdown with hysteresis, and reset function
for immediate power output shutdown.
Built-in thermal shutdown protects the chip against overtemperature and short-circuit. In
overload condition, the channel turns off, then back on automatically after the IC
temperature has decreased below a reset threshold. If this condition causes the case
temperature to reach the TCR limit, the overloaded channel is turned off and will restart only
when case and junction temperature have decreased down to the reset threshold. Non
overloaded channels continue to operate normally.
An internal circuit provides an OR-wired non latched common FAULT indicator signaling
channel OVT. The FAULT pin is an open-drain active-low fault indication pin.
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Contents
AN4373
Contents
1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Board description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
Power section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2
Digital interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3
PC communication using the STEVAL-PCC009V2 connection and HSD
GUI interface 11
4
Reference documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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1
Features
Features
• VCC operating voltage from 10.5 to 33 V
• 0.7 A for each channel
• Reverse polarity protection on VCC and VDD supply voltage
• Digital supply voltage VDD 3.3/5 V
• Microcontroller interface direct/synchronous mode communication
• Designed to meet requirements of IEC 61000-4-2, IEC 61000-4-4, IEC 61000-4-5 and
IEC 61000-4-8 standards
• RoHS compliant
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Board description
2
AN4373
Board description
Below the board structure is summarized in terms of connectors and jumpers useful for
device driving.
Figure 1. STEVAL-IFP015V2
Table 1. STEVAL-IFP015V2 connector and jumper description
Name
Type
Function
JP1
Drop jumper
VDD digital supply voltage
J3
Drop Jumper
Output enable pin
J2
Screw connector
VCC supply voltage
J1
Screw connector
VDD digital supply voltage
J4
Power outputs
Device power outputs
30 pin connector
Microcontroller interface
CN1
Table 2. STEVAL-IFP015V2 30-pin signal connector description
Pin number
1
3.3 V communication board digital output voltage
2
GND reference
3
Parallel Input pin IN1
4
Parallel input pin IN2
5
Parallel input pin IN3
6
Parallel input pin IN4
7-12
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Description
NC
13
GND reference
14
NC
15
Parallel input 8
16
Parallel input 5
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Board description
Table 2. STEVAL-IFP015V2 30-pin signal connector description (continued)
Pin number
Description
17
Parallel input 6
18
Parallel input 7
19
Fault feedback for erroneous communication or thermal junction intervention
20
NC
21
NC
22
Not used
23
NC
24,25
Reserved
26,27
NC
28
29,30
GND reference
NC
Table 3. STEVAL-IFP015V2 electrical specifications (recommended values)
Parameter
Description
VCC
Main supply voltage
VDD
Digital voltage supply
IVcc
Current consumption
VCLAMP
Supply voltage clamp
Test condition
Typ
Unit
24
V
3.3 / 5
V
VDD = 5 V channels ON
8
VDD = 5 V channels OFF
5
48
mA
V
Table 4. STEVAL-IFP015V2 component list
Reference
Description
Component
Part number
CN1
CON30
30 pin connector for
flat cable
C1
100 uF/50 V
Electrolytic capacitor
EEEFP1H101AP
C2
1 uF/50 V
Electrolytic capacitor
Low ESR
GRM31MR71H105KA88L
C3
1 uF/50 V
Ceramic capacitor
C4
4.7 nF Y1/4 kV
Single layer capacitor
high
Voltage
VY1472M63Y5UQ6*V0
C5
4.7 nF Y1 /4 kV
Single layer high
voltage capacitor
C7,C8,C9,C10,C11,
C12,C14,C16
22 nF/50 V
Ceramic capacitor
C6
220 nF/10 V
Electrolytic capacitor
low ESR
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VY1472M63Y5UQ6*V0
GRM188R71A224KA01D
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Board description
AN4373
Table 4. STEVAL-IFP015V2 component list (continued)
Reference
6/14
Description
Component
C13,C15,C17,C18,
C19,C20,C21,C22,
C23,C24,C25
100 pF/10 V
Ceramic capacitor
C26
47 uF/10 V
Ceramic capacitor
D1
STPS1H100A
Schottky diode SMD
D13
STPS1L60A
Schottky diode SMD
D2
Red
LED
D3
Green
LED
D4
Yellow
LED
D5, D6, D7, D8, D9,
D10, D11, D12
Green
LED
J1,J2
CON2
Screw connector 2
pole
J3
OUT_EN
Drop jumper three
way
J4
CON8
Screw connector
8pole
JP1
VDD
Drop jumper 4 way
R1,R2,R3
680R
SMD resistor
R4,R5,R6,R7,R8,
R9,R10,R12, R14,
R15, R16
270R
SMD resistor
R11
10 k
SMD resistor 1%
R19,R20,R21,R22
R23,R24, R25, R26, 10 k
R27
SMD resistor
R17
NC
Not connected
R13
15 k
SMD resistor 1%
R18
10 k
SMD resistor 1%
R28, R29, R30, R31,
6 k8
R32, R33, R34, R35
SMD resistor
TP1,TP3,TP4
T POINT A
Test point
TP2
T POINT R
Test point
TRS1
SM15T33CA
Transil SMD
U1
ISO8200B
Device PSO36
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Part number
GRM32ER71A476KE15
AN4373
Board description
Figure 2. STEVAL-IFP015V2 component plane
Figure 3. STEVAL-IFP015V2 top layer
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Board description
AN4373
Figure 4. STEVAL-IFP015V2 internal layer 1
Figure 5. STEVAL-IFP015V2 internal layer 2
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Board description
Figure 6. STEVAL-IFP015V2 bottom layer
2.1
Power section
This device, due to internal galvanic isolation, has two ground references, GNDDD for VDD
digital supply and GNDCC for VCC main supply. Both supply voltages has reverse polarity
protection implemented with the STPS1L60A diode on VDD and with STPS1H100A diode on
VCC main voltage.
The operating supply values are variable within a range of 10.5 V - 3.3 V for VCC supply, and
a range of 3.1 V to 5.5 V for VDD. This latter reference can be selected using three way drop
jumper J1
Note:
The “5 V” and “3.3 V” labels identify connection with a 30 pin connector and the possibility to
power the device by microcontroller board, whereas the “EXT” label identifies connection
with screw connector.
A bidirectional transil diode SM15T33CA, connected on the VCC supply improves EMC
stress robustness; while capacitors C4 and C5 realize a coupling network in case of EMC
common mode test.
2.2
Digital interface
The STEVAL-IFP015V2 microcontroller interface permits device driving in:
1.
Direct Mode: for instantaneous output control
2.
Synchronous Mode: for triggered outputs control. This mode is useful if a lower delay of
all outputs is needed
Both modalities are managed by modifying the default state of the Sync and Load signals.
By default they are pulled up by the two signal LEDs D2 and D3. Pulling down these two
signals at the same time, Direct Mode is active, so it is sufficient to change the input state to
change the corresponding output as well.
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AN4373
Toggling in sequence the Load and Sync signals respectively, modification of the
synchronous output state is possible.
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PC communication using the STEVAL-PCC009V2 connection and HSD GUI interface
PC communication using the STEVAL-PCC009V2
connection and HSD GUI interface
Figure 7. GUI interface Direct Mode
Figure 8. GUI interface Synchronous Mode
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Reference documents
4
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AN4373
Reference documents
•
ISO8200B datasheet
•
IEC 61000-4-4
•
IEC 61000-4-5
•
IEC 61000-4-2
•
IEC 61000-4-8
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5
Revision history
Revision history
Table 5. Document revision history
Date
Revision
15-Oct-2013
1
Changes
Initial release.
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AN4373
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