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PDF MAP3201 Data sheet ( Hoja de datos )
| Número de pieza | MAP3201 | |
| Descripción | High current switch mode PWM LED Driver | |
| Fabricantes | MagnaChip | |
| Logotipo |  |
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General Description
The MAP3201 is a high efficiency current mode PWM driver. It is
designed for LED driver that is used as the light source of LCD
panel. The controller can achieve efficiency higher than 90% for
buck and boost applications.
The MAP3201 for accurate LED dimming control use external
PWMI signal and set internal frequency by external resistor
which is programmable.
The MAP3201 has a stable operation with wide input voltage
because it can be operated as separated VCC with input voltage
It has a auto-restart recovery protection if the system occur fault
signal. it can provide a good safety features.
Multiple MAP3201 have synchronized to each others or to other
external clock which is generated by Sync Pin.
The MAP3201 provide a 0.4A source current and 0.8A Sink
current gate driver. This can be suitable for high power
application. Using BCD process, the MAP3201 has a good
immunity at switching noise.
The MAP3201’ application can be so easy to making lowest cost
system.
The MAP3201 is available in 16-Lead SOIC package and it is
offered in Halogen-free (fully RoHS compliant).
For more information, please contact local MagnaChip sales
office in world-wide or visit MagnaChip’s website at
www.magnachip.com.
MAP3201
High current switch mode PWM LED Driver
Features
PWM Interface LED Driver
Current Mode Control Type
Auto Restart Mode Protection
Output Over Voltage Protection
Programmable LED Short Current Protection
Power Supply VCC=12V (Max 20V)
Programmable LED Current Set (FBP)
Programmable Boost switch current limit
Synchronization to peer-to-peer or external clock
Fully RoHS Compliant
Application
RGB and White LED Backlighting applications
General LED lighting applications
Typical Application Circuit
Jan. 2009. Version 1.0
MagnaChip Semiconductor Ltd.
1 page  
Electrical Characteristics (Continued)
VCC=12V, VPWMI=5V, CGATE=CPWMO=1nF, Ta=25℃, unless otherwise specified
Programmable Short current protection ( ISET )
VCM,ISET
Input common-mode range of
comparator
-
-0.3 - 3 V
VOFF,ISET
Input offset voltage of comparator
VISET=1V
-20 - 20 mV
TOFF
Propagation time for short current
detection (2)
VISET=1V,
VFBN=0.9 to 1.1V step
- - 250 ns
VPWMO goes from high to low
Note 1: Stress beyond the maximum ratings listed above may incur permanent damage to the device. Operating above the recommended
conditions for extended time may stress the device and affect device reliability. Also the device may not operate normally above the
recommended operating conditions. These are stress ratings only.
Note 2: These parameters, although guaranteed by design, are not tested in mass productioin.
Jan. 2009. Version 1.0
MagnaChip Semiconductor Ltd.
5 Page 
Preliminary – Subject to change without notice
PROTECTION
The MAP3201 offers the features such as UVLO, Boost current limit,
Over Voltage Protection and Short Circuit Protection of LED (SCP).
OVP and SCP are operated in auto restart protection mode.
1. Under-Voltage Lock-Out (UVLO)
When VCC voltage reaches over 8V, UVLO starts operating which
enables Internal 5V Regulator, making all internal control circuits
including oscillator, gate driver and protection circuit ready for
operation and output pin of GATE, PWMO and COMP starts
operating depending on the input status of PWMI.
If VCC voltage drops below 7V during normal operation, UVLO
starts operating, shutting down Internal Control Circuit and stopping
operation of GATE, PWMO and COMP. It is followed by disabling of
internal 5V regulator, and shut off of all IC operation.
2. Pulse by Pulse Current Limit
It will operate Pulse by Pulse current limit as voltage ratio between
COMP Pin Voltage which is controlled by Gm Amp of Boost
converter and CS Pin voltage which will be caused by external
Boost FET.
3. Maximum Current Limit
Maximum current that is driven into Boost FET through CLIM Pin
voltage can be set up as in Figure 5
4. Over Voltage Protection (OVP)
The MAP3201 offers over voltage protection in order to protect
MOSFET of boost converter and external component connected to
Output pin when output voltage is in abnormal condition.
OVP Circuit monitors whether output voltage is stable level or not
If OVP Pin voltage reaches threshold condition (typical 3V), it can
shut off the switching of GATE and PWMO and then output voltage
is falling as much as the leakage current time. If the voltage of OVP
Pin reaches OVP falling threshold (typical 2.7V), IC releases
protection mode. In this time, protection releasing can be decided
as value of capacitor with the longer discharge between auto restart
time and the time of leakage current connected to output.
The over voltage protection can be decided in the following
equation.
- Protection voltage:
VO
=
3.0 *
RO 2
RO1 + RO2
- Protection release voltage:
VO
=
2.7 *
RO 2
RO1 + RO2
Figure 5 Current Sense and Maximum current limit
Figure 6 Over voltage protection circuit
The MAP3201 included LPF(low pass filter) of typical 200nS in OVP
circuit for better noise immunity, It may need a high noise margin
when Ro1 and Ro2 use high resistance value in order to minimize
Power loss.
In this case, it is recommended to add Capacitor.
VC, MAX: Maximum output voltage of Gm Amp
VOFF: Offset voltage of PWM comparator
VCS
= VC,MAX − 0.6V
5
− VOFF
VCS = VCLIM
The equation above can be used to set up Maximum boost current
when VCLIM is VCS.
5. Programmable Short Current Protection of LED
(SCP)
The MAP3201 offers protection circuit to prevent short current when
LED string is shorted
In Figure 7 when LED string is shorted, the voltage of FBN Pin can
be calculated in the following equation
VFBN = I LED ∗ RLED
OCT.15 2009. Version 0.3
MagnaChip Semiconductor Ltd.
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAP3201.PDF ] | |
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