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PDF MAP3612 Data sheet ( Hoja de datos )
| Número de pieza | MAP3612 | |
| Descripción | 2-CH Average Current Control Buck Controller | |
| Fabricantes | MagnaChip | |
| Logotipo |  |
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Confidential
Datasheet Version 1.0
Datasheet - MAP3612
2-CH Average Current Control Buck Controller for LED Backlight
General Description
MAP3612 is a 2 channel average-mode current
control buck controller for LED backlight application. It
does not require an additional dimming MOSFET and
utilizes constant off-time control and average current
control feedback without external loop compensation
or high-side current sensing.
MAP3612 features ±1% CS voltage accuracy and
has dedicated analog dimming input up to 3V. It can
be powered from 8.5V ~ 18V supply.
MAP3612 provides MOSFET DS short detection(FLT
output), SCP, ODP and UVLO.
MAP3612 is available 16 leads SOIC with Halogen-
free (fully RoHS compliant).
Features
8.5V to 18V Input Voltage Range
Average-Mode Current Control
Programmable Constant Off-time
- Independent Setting per Channel
Up to 3V Analog Dimming Input
1% CS Voltage Accuracy
Independent Direct PWM Dimming Input
Fault Output
- MOSFET Drain-Source Short
Short Circuit Protection
Over-Duty Protection
UVLO
16 Leads SOIC Package with Halogen-free
Applications
High Brightness white LED backlighting for LCD
TVs
General LED lighting applications
Ordering Information
1
Part Number
MAP3612SIRH
Top
Marking
MAP3612
Ambient
Temperature Range
-40℃ to +85℃
Package
16Leads SOIC
RoHS Status
Halogen Free
Typical Application
VCC
SEL
MODE
PWM1
PWM2
ADIM
Dec 02nd 2015
TOFF1 TOFF2
GATE1 GATE2
CS1
CS2
PGND1 PGND2
VCC
SEL
MODE
PWM1
PWM2
ADIM
FLT
GND
FLT
1 page  
Confidential
Electrical Characteristics
Unless noted, VVCC = 12V, CVCC = 1.0F, and typical values are tested at TA = 25C.
Parameter
Test Condition
Supply
VVCC Input Voltage Range
IQ Quiescent Current
VUVLO
Under Voltage Lockout
Threshold Voltage on VCC pin
OFF Timer
tOFFx
GATE1/2 Off-time
tON_MIN Min. On-Time
tON_MAX Max. On-Time
tOFF_MIN Min. Off-Time
DMAX
Max. Duty Cycle
GATE Driver
VPWM = 5V, VCS = 0V
Release threshold(rising VVCC)
Lockout hysteresis(falling VVCC)
RTOFFx=52kΩ
RTOFFx=104kΩ
VADIM = 3V
VADIM = 3V, tOFF=1.2us
ISOURCE GATE1/2 Source Current
ISINK GATE1/2 Sink Current
tRISE GATE1/2 Output Rising Time
tFALL GATE1/2 Output Falling Time
Current Sense & Dimming
VGATE1/2 = 0V,
VGATE1/2 = VVCC=12V
CGATE1/2=1nF, VVCC = 12V
CGATE1/2=1nF, VVCC = 12V
VADIM ADIM Input Voltage Range
AV VADIM to CS1/2 Voltage Ratio
VCS1/2 CS1/2 Voltage
VADIM = 0.5V
VADIM = 3.0V
tLEB Leading Edge Blanking Time
Logic Interface
5
VPWM1/2
Logic Input Level on
PWM1/2 pins
VPWM1/2_L : Logic Low
VPWM1/2_H : Logic High
RPWM1/2 Pull-down Resistor on PWM1/2 pins VPWM1/2 = 4V
VMODE Logic Input Level on MODE pin
VMODE_L : Logic Low
VMODE_H : Logic High
RMODE Pull-down Resistor on MODE pin
VMODE = 4V
VSEL Logic Input Level on SEL pin
VSEL_L : Logic Low
VSEL_H : Logic High
RSEL
Pull-down Resistor on SEL pin
VSEL = 4V
Protection
AVSCP VADIM to SCP Voltage Ratio
VSCP
SCP Detection Threshold Voltage
on CS1/2 pins
tDELAY
tRESTART
VSCPDS
VFLT
RFLT
DOD1
DOD2
tOD
SCP Delay Time
Restart Time
MOSFET DS Short Detection
Threshold Voltage on CS1/2 pins
FLT pin High Voltage
FLT pin Internal Resistance
Protection Duty for OD1
Protection Duty for OD2
Auto-Restart time for OD1/2
0.5 <= VADIM <= 2.5V
VADIM = 0.5V
VADIM = 1.0V
VADIM = 2.5V
VADIM = 0.5V (Note 1, 2)
VADIM = 2.5V (Note 1, 2)
VFLT : Logic High
VMODE = GND or Floating
Note 1: These parameters, although guaranteed by design, are not tested in mass production.
Note 2: At start-up(VVCC >= VUVLO release threshold)
Datasheet Version 1.0
Min Typ Max Unit
8.5 18 V
3.4 mA
7.5 8.0 8.5
0.5 1.0 1.5
V
4.5 5.0 5.5
9 10 11
300
37
1.2 1.5
97
us
ns
us
us
%
400 mA
800 mA
50 85 ns
25 45 ns
0.5
0.2512
1.5073
0.5075
300
3.0
0.2563
1.5377
V
V/V
V
ns
0.8
V
2.0
50 100 150 kΩ
0.8
V
2.0
50 100 150 kΩ
0.8 V
2.0
50 100 150 kΩ
0.8075
1.6150
4.0375
4.5
2.5
55
35
1.7
0.8500
1.7000
4.2500
300
1
0.25
1.25
57
37
100
0.8925
1.7850
4.4625
5
5
59
39
V/V
V
ns
ms
V
V
kΩ
%
%
ms
Dec 02nd 2015
5 Page 
Confidential
Datasheet Version 1.0
OVER-DUTY PROTECTION
The MAP3612 provides over-duty protection for PWM
inputs in case the MODE pin is logic ‘LOW’ or floated.
In general, this status is 3D mode in TV applications.
The logic status on the SEL pin decides the protection
duty of PWM inputs as following table.
OD1
OD2
Available Duty
Up to 55%
Up to 35%
Duty Protection
ODP over 56%
ODP over 36%
Following table summarizes the relationship between
MODE, SEL pins and ODP.
Input
MODE
SEL
HIGH
2D
OD1
LOW or FLOATING
3D
OD2
At the ODP status, the MAP3612 rechecks the
protection status at every 100ms. If the error is removed,
the IC status will be automatically recovered.
SCP
If the CS voltage rises VSCP during normal operation,
11 the MAP3612 turns-off the GATE output after tDELAY(typ.
300ns) time. The auto-restart time is typ. 1ms(tRESTART).
This protects for hard instantaneous short such as
catch diode, inductor or LED bar short.
tDELAY
tDELAY
GATE
VSCP
CS
tRESTART
The SCP voltage varies according to ADIM voltage as
following graph.
4V
VSCP
VADIM*1.7
4.42V
UVLO
The MAP3612 has an Internal LDO regulator to
supply internal circuit and GATE driver. This LDO is
powered up when the VCC voltage rises to UVLO
release threshold.
If the voltage on the VCC pin falls below UVLO
lockout threshold, the device turns-off the GATE output
and be reset. This ensures fail-safe operation for VCC
input voltage falling.
1V
0.5V
VADIM
2.6V 3.0V
Dec 02nd 2015
11 Page | ||
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| PDF Descargar | [ Datasheet MAP3612.PDF ] | |
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