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PDF ACT4524 Data sheet ( Hoja de datos )
| Número de pieza | ACT4524 | |
| Descripción | 40V/3.5A Buck Converter | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ACT4524 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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ACT4524
Rev 0, 28-Jul-15
40V/3.5A Buck Converter with Dual Output and Separated Over Current Protection
FEATURES
40V Input Voltage Surge
4.5V-36V operational Input Voltage
Dual 5.1V Outputs with 1% Accuracy
Up to 3.5A Output Current
2.65A Constant Current Regulation for VOUT1
1.2A Constant Current Regulation for VOUT2
Hiccup Mode Protection at Output Short
>90% Efficiency at Full Load
<0.5mA Low Standby Input Current
5.7V Output Over Voltage Protection
Cord Voltage Drop Compensation
Meet EN55022 Class B Radiated EMI Standard
SOP-8EP Package
APPLICATIONS
Car Charger
Cigarette Lighter Adaptor (CLA)
Rechargeable Portable Device
CV/CC regulation DC/DC converter
GENERAL DESCRIPTION
ACT4524 is a wide input voltage, high efficiency
step-down DC/DC converter that operates in either
CV (Constant Output Voltage) mode or CC
(Constant Output Current) mode. ACT4524 has
separated output current limits for dual ports CLA
application. With the separated current limits, the
CLA can meet Apple’s MFI standard.
ACT4524 provides up to 3.5A output current at
125kHz switching frequency. ACT4524 utilizes
adaptive drive technique to achieve good EMI
performance while maintain 90% efficiency at full
load for mini size CLA designs.
ACT4524 also has built in hiccup mode output short
circuit protection. The average output current is
reduced to below 6mA when output is shorted to
ground. Other features include output over voltage
protection and thermal shutdown.
ACT4524 is available in a SOP-8EP package and
require very few external components for operation.
Typical Application Circuit
Output VI Profile
Innovative PowerTM
- 1 - www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
1 page  
FUNCTIONAL BLOCK DIAGRAM
ACT4524
Rev 0, 28-Jul-15
FUNCTIONAL DESCRIPTION
Output Current Sensing and Regulation
The conventional cycle-by-cycle peak current mode
is implemented with high-side FET current sense.
Sense resistors are connected to the channel 1 and
channel 2 outputs, respectively. The sensed
differential voltage is compared with interval
reference to regulate current. CC loop and CV loop
are in parallel. The current loop response is allowed
to have slower response compared to voltage loop.
However, during current transient response, the
inductor current overshoot/undershoot should be
controlled within +/-25% to avoid inductor
saturation.
Input Over Voltage Protection
The converter is disabled if the input voltage is
above 42V (+/-2V). Device resumes operation
automatically 40ms after OVP is cleared.
Output Over Voltage Protection
Device stops switching when output over-voltage is
sensed, and resumes operation automatically when
output voltage drops to OVP- hysteresis.
Output Under-Voltage Protection /
Hiccup Mode
There is a under voltage protection (UVP)
threshold. If the UVP threshold is hit for 10us, an
over current or short circuit is assumed, and the
converter goes into hiccup mode by disabling the
converter and restarts in 4 seconds and restarts.
Cord Compensation
In some applications, the output voltage is
increased with output current to compensate the
potential voltage drop across output cable. The
compensation is based on the high side feedback
resistance.
The compensation voltage is derived as:
ΔVout = (VCSP-VCSN1)*K
Where VCSP-VCSN1=60mV and K=5/6. This voltage
difference could be added on the reference or
turning the (VCSP-VCSN) voltage into a sink current at
FB pin to pull Vout higher than programmed
voltage.
The cord compensation loop should be very slow to
avoid potential disturbance to the voltage loop. The
voltage loop should be sufficiently stable on various
cord compensation setting.
Thermal Shutdown
If the TJ increases beyond 160°C, ACT4524 goes
into HZ mode and the timer is preserved until TJ
drops by 30°C.
Innovative PowerTM
- 5 - www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
5 Page 
BOM List for 5V/4.8A Car Charger
ITEM REFERENCE
DESCRIPTION
1
U1,U2
IC, ACT4524, SOP-8EP
2
L1,L2
Inductor, 40µH, 6.0A, 20%, DCR=15mΩ
3
D1,D2
Diode, Schottky, 40V/5A, S54
4 C1 Capacitor, Electrolytic, 47uF/35V, 6.3х7mm
5
C2,C9
Capacitor, Ceramic, 0.1µF/35V, 0805, SMD
6
C3,C10
Capacitor, Ceramic, 10µF/35V, 1206, SMD
7
C4,C11
Capacitor, Ceramic, 22nF/25V, 0603, SMD
8
C5,C12
Capacitor, Ceramic, 2.2nF/10V, 0603, SMD, optional
9
C6,C13
Capacitor, Ceramic, 10uF/10V, 1206, SMD
10
C7,C14
Capacitor, Electrolytic, 220uF/10V, 6.3х7mm
11
C8,C15
Capacitor, Ceramic, 2.2µF/10V, 0805, SMD
12
R1,R8
Chip Resistor, 0Ω, 1/10W, 5%, 0603
13
R2,R9
Chip Resistor, 5.1Ω, 1/8W, 5%, 0805, optional
14 Rcs1,Rcs2 Chip Resistor, 25mΩ, 1/4W, 1%, 1206
15 R3, R4,R10,R11 Chip Resistor, 49.9kΩ, 1/10W, 5%, 0603
16 R5, R6,R12,R13 Chip Resistor, 43.2kΩ, 1/10W, 5%, 0603
17 R7 Chip Resistor, 82kΩ, 1/10W, 5%, 0603
18
USB
USB Rev A
ACT4524
Rev 0, 28-Jul-15
MANUFACTURER
Active-Semi
Murata, TDK
Vishay
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
Murata, TDK
QTY
2
2
2
1
2
2
2
2
2
2
2
2
3
2
4
4
1
2
Innovative PowerTM
- 11 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ACT4524.PDF ] | |
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