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PDF APL3540 Data sheet ( Hoja de datos )
| Número de pieza | APL3540 | |
| Descripción | High-Side Power Distribution Controller | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APL3540
High-Side Power Distribution Controller
Features
General Description
• High-Side Driver for an External N-Channel
MOSFET
• Under-Voltage Lockout (UVLO)
• Wrong VIN Input Voltage Protection
• Output Under-Voltage Protection (UVP)
• Short-Circuit Protection During Power-Up (SCP)
• Over-Current Protection (OCP)
• Shutdown Function
• Power-Ok (POK) Function
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Desktop PCs
APL3540 is a high-side power distribution controller for
an external N-channel MOSFET, allow for +12V and +19V
power-supply rails. The wrong input voltage protection
function protects a wrong input adapter insertion. When
input voltage is out of the target input voltage range, the IC
is off.
The built-in under-voltage protection monitors the output
voltage for short-circuit conditions. When output voltage
is less than 70% of VIN voltage, the IC will be shut down.
The over-current protection monitors the output current
by using the voltage drop across the external MOSFET’s
R . When output current reaches the trip point, the IC
DS(ON)
will be shut down. The APL3540 also provides a short-
circuit protection during power-up. The device monitors
DRV and VOUT voltages for a short-circuit detection. If a
short-circuit condition is detected, the IC will be shut
down. Other features, including a POK output which indi-
cates that the output voltage is ready and a logic-con-
trolled shutdown mode.
Pin Configuration
VIN 1
OCSET 2
DRV 3
VOUT 4
SOP-8
(Top View)
8 VINSEL
7 POK
6 GND
5 EN
VIN 1
OCSET 2
DRV 3
VOUT 4
8 VINSEL
7 POK
6 GND
5 EN
TDFN2x2-8
(Top View)
=Exposed Pad
(Please connect to the ground)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.9 - Oct., 2013
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APL3540
Typical Operating Characteristics
Supply Current vs. Input Voltage
800
700
600 EN=High
500
400 EN=Low
300 VIN =19V, RLOAD =100Ω CIN =0.1µF/X7R,
COUT =1500µF/Electrolytic,
200
8 12 16 20 24 28 32 36
Input Voltage (V)
VINSEL Detection Threshold Voltage
vs. Input Voltage
3.0
TA=25oC
2.5
2.0 VVINSEL (H)
1.5
1.0 VVINSEL (L)
0.5
0.0
10
15 20 25 30
Input Voltage (V)
35
VIN UVLO Threshold Voltage vs.
Junction Temperature
8.5
8.0
7.5 VIN Rising
7.0
VIN Falling
6.5
6.0
-50
0 50 100
Junction Temperature (oC)
150
VINSEL Detection Threshold
Voltage vs. Junction Temperature
2.0
1.9 VVINSEL (H)
1.8
1.7
1.6
1.5
1.4
1.3
1.2 VVINSEL (L)
1.1
1.0
-50
0
50 100 150
Junction Temperature (oC)
Copyright © ANPEC Electronics Corp.
Rev. A.9 - Oct., 2013
5
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APL3540
Function Description (Cont.)
Short-Circuit Protection (Cont.)
the V voltage will not follow the V to rise, eventually,
OUT
DRV
when VDRV - VOUT > short circuit protection threshold, the
SCP happens. Since the COUT demands the most current
during power-up, the supplying current via the MOSFET
should satisfy the following equation for a completion of
power-up.
I > ISUPPLY(max) CHARGING
where:
ICHARGING = COUT x (185µA/C1)
•
I
SUPPLY(max)
is
the
maximum
supply
current
via
the
MOSFET in the conditions of V = short circuit protec-
GS
tion threshold and VDS = VIN -VOUT .
• ICHARGING is the charging current of COUT during soft-start.
• COUT is output capacitor.
• C1, placed on the gate of MOSFET is the capacitor that
controls the ramp-up rate of output voltage during soft-
start.
• 185µA is the soft-start current driving from the DRV pin
during the power-up process.
For example, If COUT=1500µF, C1=100nF, short circuit
protection threshold=3.0V and VIN=19V, the ICHARGING de-
manded by the output capacitor is 2.78A. The ISUPPLY(max) in
the conditions of V = 3.0V and V = 19V (while V -V
GS DS
IN OUT
VIN) should be greater than the I .CHARGING We set the
safety margin that is 1.5 times greater than the demanded
2.78A, therefore, we can choose a MOSFET that can de-
liver at least 4.17A in such conditions.
Shutdown Control
The APL3540 has an active-low shutdown function. Pull-
ing the VEN above 2V will enable the IC; pulling VEN below
0.6V will disable the IC and the POK is pulled low imme-
diately (ignore the V and T ), the VOUT voltage is
POK(TH)
D(POK)
also discharged to the GND by an internal resistor. EN
pin is pulled high by an internal current source and can
be left floating.
Copyright © ANPEC Electronics Corp.
Rev. A.9 - Oct., 2013
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet APL3540.PDF ] | |
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