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VNF1248F Datasheet(PDF) 34 Page - STMicroelectronics

Part # VNF1248F
Description  High-side switch controller with intelligent fuse protection for 12 V, 24 V and 48 V automotive applications
PDF  79 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VNF1248F Datasheet(HTML) 34 Page - STMicroelectronics

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9.1
Control algorithm
The following flow charts show the sequence of operations foreseen by CCM control algorithm, for those device
states in which load charging is allowed.
Figure 10. CCM in unlocked state (1)
CCM turn on
(CR#1)
PWM pulses =
max. number?
Yes
Yes
No
No
VOUT > VOUT threshold?
No
No
Yes
Yes
Unlocked
CCM off
Unlocked
CCM off
VDS < VDS threshold?
CCM timeout elapsed?
CCM operation
(SR#1)
status update
Normal frequency
generation
PWM pulses
CCM parameters
(CR#3, CR#5)
configuration
Low frequency
generation
PWM pulses
Customer
Operation
Device
Operation
Note:
(1) Same flow chart in locked mode but it is not possible to perform the first step, CCM parameter configuration
(CR#3, CR#5). In this case it needs to configure before enter in the locked state.
Figure 11. CCM in fail-safe state
CCM turn on
(DIN toggling)
PWM pulses =
max. number?
Yes
Yes
No
No
VOUT > VOUT threshold?
No
No
Yes
Yes
Fail-safe
CCM off
VDS < VDS threshold?
CCM timeout elapsed?
CCM operation
(SR#1)
status update
Normal frequency
generation
PWM pulses
Low frequency
generation
PWM pulses
Customer
Operation
Device
Operation
Fail-safe
CCM off
VNF1248F
Capacitive charging mode–CCM
DS14109 - Rev 7
page 34/79



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