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SC4612STRT Fiches technique(PDF) 11 Page - Semtech Corporation

No de pièce SC4612STRT
Description  Wide Input Range High Performance Synchronous Buck Switching Controller
PDF  24 Pages
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Fabricant  SEMTECH [Semtech Corporation]
Site Internet  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4612STRT Fiches technique(HTML) 11 Page - Semtech Corporation

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 2007 Semtech Corp.
www.semtech.com
SC4612
POWER MANAGEMENT
Applications Information (Cont.)
Below are examples of calculating the OCP trip voltages.
Low Side R
DS_ON Current Limit
1. Ra, Rb - Not installed:
2
R
Vphase
mV
100
3
R
mV
100
V
75
.
2
−
=
−
solving for: V
PHASE = -100mV, therefore the circuit will trip @ RDS_ON x ILOAD = 100mV
2. To lower trip voltage - install Rb. For example: Rb = 13k
)
1
R
Rb
(
||
2
R
Vphase
mV
100
3
R
mV
100
V
75
.
2
+
−
=
−
solving for: V
PHASE = -20mV, obviously more sensitive! RDS_ON x ILOAD = 20mV
3. To increase trip voltage - install Ra. For example: Ra = 800k; V
DRIVE = 7.8V typ.
2
R
Vphase
mV
100
1
R
Ra
Vdrive
3
R
mV
100
V
75
.
2
−
=
+
+
−
solving for: V
PHASE = -200mV. Current limit has doubled compared to original conditions.
NOTE! Allow for tempco and R
DS_ON variation of the MOSFET - see “overcurrent protection” information on page 11 in the
datasheet.
PHASE pin
2.75V
OCP
SC4612
R5
10k
R1
2k
Ra
Rb
R4
260k
R3
130k
R2
10k
C2
5pF
C1
2pF
ILIM pin
DRV pin
COMP
+100mV
L
R
load
Vin
Iload@Toff



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