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PDF MAX15004A Data sheet ( Hoja de datos )
| Número de pieza | MAX15004A | |
| Descripción | 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers | |
| Fabricantes | Maxim Integrated | |
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EVALUATION KIT AVAILABLE
MAX15004A/B-MAX15005A/B
General Description
The MAX15004A/B/MAX15005A/B high-performance,
current-mode PWM controllers operate at an automotive
input voltage range from 4.5V to 40V (load dump). The
input voltage can go lower than 4.5V after startup if IN is
bootstrapped to a boosted output voltage. The controllers
integrate all the building blocks necessary for implementing
fixed-frequency isolated/nonisolated power supplies. The
general-purpose boost, flyback, forward, and SEPIC con-
verters can be designed with ease around the MAX15004/
MAX15005.
The current-mode control architecture offers excellent line-
transient response and cycle-by-cycle current limit while
simplifying the frequency compensation. Programmable
slope compensation simplifies the design further. A fast
60ns current-limit response time, low 300mV current-limit
threshold makes the controllers suitable for high-efficiency,
high-frequency DC-DC converters. The devices include
an internal error amplifier and 1% accurate reference to
facilitate the primary-side regulated, single-ended flyback
converter or nonisolated converters.
An external resistor and capacitor network programs the
switching frequency from 15kHz to 500kHz (1MHz for
the MAX15005A/B). The MAX15004A/B/MAX15005A/B
provide a SYNC input for synchronization to an
external clock. The maximum FET-driver duty cycle for the
MAX15004A/B is 50%. The maximum duty cycle can be
set on the MAX15005A/B by selecting the right combina-
tion of RT and CT.
The input undervoltage lockout (ON/OFF) programs the
input-supply startup voltage and can be used to shutdown
the converter to reduce the total shutdown current down
to 10µA. Protection features include cycle-by-cycle and
hiccup current limit, output over-voltage protection, and
thermal shutdown.
The MAX15004A/B/MAX15005A/B are available in space-
saving 16-pin TSSOP and thermally enhanced 16-pin
TSSOP-EP packages. All devices operate over the -40°C
to +125°C automotive temperature range.
Applications
●● Automotive
●● Vacuum Fluorescent Display (VFD) Power Supply
●● Isolated Flyback, Forward, Nonisolated SEPIC, Boost
Converters
Pin Configuration appears at end of data sheet.
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC
Power-Supply Controllers
Benefits and Features
●● Wide Supply Voltage Range Meets Automotive
Power-Supply Operating Requirement Including
“Cold Crank” Conditions
• 4.5V to 40V Operating Input Voltage Range
(Can Operate at Lower Voltage After Startup if
Input is Bootstrapped to a Boosted Output)
●● Control Architecture Offers Excellent Performance
While Simplifying the Design
• Current-Mode Control
• 300mV, 5% Accurate Current-Limit Threshold
Voltage
• Programmable Slope Compensation
• 50% (MAX15004) or Adjustable (MAX15005)
Maximum Duty Cycle
●● Accurate, Adjustable Switching Frequency and
Synchronization Avoids Interference with Sensitive
Radio Bands
• Switching Frequency Adjustable from 15kHz to
500kHz (1MHz for the MAX15005A/B)
• RC Programmable 4% Accurate Switching
Frequency
• External Frequency Synchronization
●● Built-In Protection Capability for Improved System
Reliability
• Cycle-by-Cycle and Hiccup Current-Limit
Protection
• Overvoltage and Thermal-Shutdown Protection
• -40°C to +125°C Automotive Temperature Range
• AEC-Q100 Qualified
Ordering Information
PART
PIN-PACKAGE MAX DUTY CYCLE
MAX15004AAUE+ 16 TSSOP-EP*
50%
MAX15004AAUE/V+ 16 TSSOP-EP*
50%
MAX15004BAUE+ 16 TSSOP
50%
MAX15004BAUE/V+ 16 TSSOP
50%
MAX15005AAUE+ 16 TSSOP-EP*
Programmable
MAX15005AAUE/V+ 16 TSSOP-EP*
Programmable
MAX15005BAUE+ 16 TSSOP
Programmable
MAX15005BAUE/V+ 16 TSSOP
Programmable
Note: All devices are specified over the -40°C to +125°C
temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
*EP = Exposed pad.
19-0723; Rev 5; 9/15
1 page  
MAX15004A/B-MAX15005A/B
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC
Power-Supply Controllers
Electrical Characteristics (continued)
(VIN = 14V, CIN = 0.1μF, CVCC = 0.1μF // 1μF, CREG5 = 1μF, VON/OFF = 5V, CSS = 0.01μF, CSLOPE = 100pF, RT = 13.7kΩ, CT = 560pF,
VSYNC = VOVI = VFB = VCS = 0V, COMP = unconnected, OUT = unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted.
Typical values are at TA = +25°C. All voltages are referenced to PGND, unless otherwise noted.) (Note 1) (Figure 5)
PARAMETER
OUTPUT DRIVER
Driver Output Impedance
Driver Peak Output Current
OVERVOLTAGE COMPARATOR
Overvoltage Comparator Input
Threshold
Overvoltage Comparator
Hysteresis
Overvoltage Comparator Delay
OVI Input Current
THERMAL SHUTDOWN
Shutdown Temperature
Thermal Hysteresis
SYMBOL
CONDITIONS
ROUT-N
ROUT-P
IOUT-PEAK
VCC = 8V (applied externally),
IOUT = 100mA (sinking)
VCC = 8V (applied externally),
IOUT = 100mA (sourcing)
COUT = 10nF, sinking
COUT = 10nF, sourcing
VOV-TH VOVI rising
VOV-HYST
TDOVI
IOVI
From OVI rising above 1.228V to OUT
falling, with 50mV overdrive
VOVI = 0 to 5V
TSHDN
THYST
Temperature rising
MIN TYP MAX UNITS
1.7 3.5
3
1000
750
5
Ω
mA
1.20 1.228 1.26
125
1.6
-0.5 +0.5
160
15
V
mV
µs
µA
°C
°C
Note 1: 100% production tested at +125°C. Limits over the temperature range are guaranteed by design.
Note 2: Guaranteed by design; not production tested.
Note 3: SFoynr cthheroMniAzaXt1io5n00s5eAct/iBon, .DMAX depends upon the value of RT. See Figure 3 and the Oscillator Frequency/External
Note
4:
The external SYNC pulse triggers the discharge of the oscillator ramp. See Figure 2. During
for the MAX15004A/B; for the MAX15005A/B,
External Synchronization section).
there
is
a
shift
in
DMAX
with
fSYNC/fOSC
ratio
external
(see the
OSYscNilCla,toDrMFAreXq=ue5n0c%y/
Note
Note
5:
6:
The parameter is measured at the trip point
Slope compensation = (2.5 x 10-9)/CSLOPE
mofVla/μtcsh. ,Sweiethth0e≤AVpCplSic≤at0io.n3sV,InafnodrmFaBtio=nCsOeMctiPo.n.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX15004A/B-MAX15005A/B
Detailed Description
The MAX15004A/B/MAX15005A/B are high-performance,
current-mode PWM controllers for wide input-voltage
range isolated/nonisolated power supplies. These con-
trollers are for use as general-purpose boost, flyback,
and SEPIC controllers. The input voltage range of 4.5V
to 40V makes it ideal in automotive applications such as
vacuum fluorescent display (VFD) power supplies. The
internal low-dropout regulator (VCC regulator) enables the
MAX15004A/B/MAX15005A/B to operate directly from an
automotive battery input. The input voltage can go lower
than 4.5V after startup if IN is bootstrapped to a boosted
output voltage.
The undervoltage lockout (ON/OFF) allows the devices
to program the input-supply startup voltage and ensures
predictable operation during brownout conditions.
The devices contain two internal regulators, VCC and
REG5. The VCC regulator output voltage is set at 7.4V
and REG5 regulator output voltage at 5V ±2%. The input
undervoltage lockout (UVLO) circuit monitors the VCC
voltage and turns off the converter when the VCC voltage
drops below 3.5V (typ).
An external resistor and capacitor network programs
the switching frequency from 15kHz to 500kHz. The
MAX15004A/B/MAX15005A/B provide a SYNC input for
synchronization to an external clock. The OUT (FET-
driver output) duty cycle for the MAX15004A/B is 50%.
The maximum duty cycle can be set on MAX15005A/B by
selecting the right combination of RT and CT. The RTCT
discharge current is trimmed to 2%, allowing accurate
setting of the duty cycle for the MAX15005. An internal
slope-compensation circuit stabilizes the current loop
when operating at higher duty cycles and can be pro-
grammed externally.
The MAX15004/MAX15005 include an internal error
amplifier with 1% accurate reference to regulate the
output in nonisolated topologies using a resistive divider.
The internal reference connected to the noninverting input
of the error amplifier can be increased in a controlled
manner to obtain soft-start. A capacitor connected at SS
to ground programs soft-start to reduce inrush current and
prevent output overshoot.
The MAX15004/MAX15005 include protection features
like hiccup current limit, output overvoltage, and ther-
mal shutdown. The hiccup current-limit circuit reduces
the power delivered to the electronics powered by the
4.5V to 40V Input Automotive
Flyback/Boost/SEPIC
Power-Supply Controllers
MAX15004/MAX15005 converter during severe fault con-
ditions. The overvoltage circuit senses the output using
the path different from the feedback path to provide
meaningful overvoltage protection. During continuous
high input operation, the power dissipation into the
MAX15004/MAX15005 could exceed its limit. Internal
thermal shutdown protection safely turns off the converter
when the junction heats up to 160°C.
Current-Mode Control Loop
The advantages of current-mode control overvoltage-
mode control are twofold. First, there is the feed-forward
characteristic brought on by the controller’s ability to adjust
for variations in the input voltage on a cycle-by-cycle
basis. Secondly, the stability requirements of the current-
mode controller are reduced to that of a single-pole
system unlike the double pole in voltage-mode control.
The MAX15004/MAX15005 offer peak current-mode
control operation to make the power supply easy to design
with. The inherent feed-forward characteristic is useful
especially in an automotive application where the input
voltage changes fast during cold-crank and load dump con-
ditions. While the current-mode architecture offers many
advantages, there are some shortcomings. For higher duty-
cycle and continuous conduction mode operation where
the transformer does not discharge during the off duty
cycle, subharmonic oscillations appear. The MAX15004/
MAX15005 offer programmable slope compensation using
a single capacitor. Another issue is noise due to turn-on
of the primary switch that may cause the premature end
of the on cycle. The current-limit and PWM comparator
inputs have leading-edge blanking. All the shortcomings of
the current-mode control are addressed in the MAX15004/
MAX15005, making it ideal to design for automotive power
conversion applications.
Internal Regulators VCC and REG5
The internal LDO converts the automotive battery voltage
input to a 7.4V output voltage (VCC). The VCC output is
set at 7.4V and operates in a dropout mode at input volt-
ages below 7.5V. The internal LDO is capable of deliver-
ing 20mA current, enough to provide power to internal
control circuitry and the gate drive. The regulated VCC
keeps the driver output voltage well below the absolute
maximum gate voltage rating of the MOSFET especially
during the double battery and load dump conditions.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet MAX15004A.PDF ] | |
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