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VB525SP Datasheet(PDF) 13 Page - STMicroelectronics

Part No. VB525SP
Description  High voltage ignition coil driver power integrated circuit
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VB525SP Datasheet(HTML) 13 Page - STMicroelectronics

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VB525SP-E
Application schematic
Doc ID 18022 Rev 2
13/19
4
Application schematic
Figure 8.
Application diagram
4.1
Principle of operation
The VB525SP-E is mainly intended as a high voltage power switch device driven by a logic
level input and interfaces directly to a high energy electronic ignition coil.
The input VIN of the VB525SP-E is fed from a low power signal generated by an external
controller that determines both dwell time and ignition point. During VIN high (≥ 4V) the
VB525SP-E increases current in the coil to the desired, internally set current level.
After reaching this level, the coil current remains constant until the ignition point, that
corresponds to the transition of VIN from high to low (typ. 1.9 V threshold).
During the coil current switch-off, the primary voltage HVC is clamped at an internally set
value Vcl, typically 380 V. The transition from saturation to desaturation, coil current limiting
phase, must have the ability to accommodate an overvoltage.
A maximum overshoot of 20 V is allowed.
4.2
Feedback
When the collector current exceeds 4.5 A, the feedback signal is turned high and it remains
so, until the input voltage is turned-off.
μP
1nF
18K
VCC
HVC
GND
FLAG
Vbat
1
μF
100nF
E
LGND
VIN
+5V
BD
1K
1K
1K
Note:
ENABLE pin can be alternatively connected to LGND.


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