TI LM5007EP

LM5007EP
LM5007EP Enhanced Plastic High Voltage (80V) Step Down Switching Regulator
Literature Number: SNVS274D
LM5007EP
Enhanced Plastic High Voltage (80V) Step Down Switching
Regulator
General Description
Features
The LM5007EP Step Down Switching Regulator features all
of the functions needed to implement low cost, efficient, Buck
bias regulators. This high voltage regulator contains an 80 V,
0.7A N-Channel Buck Switch. The device is easy to apply and
is provided in the MSOP-8 and the thermally enhanced LLP-8
packages. The regulator is based on a hysteretic control
scheme using an on time inversely proportional to VIN. This
feature allows the operating frequency to remain relatively
constant with load and input voltage variations. The hysteretic
control requires no control loop compensation, while providing very fast load transient response. An intelligent current
limit is implemented in the LM5007EP with forced off time that
is inversely proportional to VOUT. This current limiting scheme
reduces load current foldback. Additional protection features
include: Thermal Shutdown, Vcc undervoltage lockout, gate
drive undervoltage lockout, and Max Duty Cycle limiter.
ENHANCED PLASTIC
• Extended Temperature Performance of −40°C to + 125°C
• Baseline Control - Single Fab & Assembly Site
• Process Change Notification (PCN)
• Qualification & Reliability Data
• Solder (PbSn) Lead Finish is standard
• Enhanced Diminishing Manufacturing Sources (DMS)
Support
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■
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Integrated 80V, 0.7A N-Channel Buck Switch
Internal HV Vcc Regulator
No Control Loop Compensation Required
Ultra-Fast Transient Response
On Time Varies Inversely with Line Voltage
Operating Frequency Nearly Constant with Varying Line
Voltage
Adjustable Output Voltage
Highly Efficient Operation
Precision Reference
Low Bias Current
Intelligent Current Limit Protection
Thermal Shutdown
External Shutdown Control
Typical Applications
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■
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Non-Isolated Buck Regulator
Secondary High Voltage Post Regulator
Selected Military Applications
Selected Avionics Applications
Ordering Information
Part Number
VID Part Number
NS Package Number (Note 3)
LM5007MMEP
V62/04633-01
MUA08A
(Note 1, Note 2)
TBD
TBD
Note 1: For the following (Enhanced Plastic) versions, check for availability: LM5007MMXEP, LM5007SDEP, LM5007SDXEP
Note 2: FOR ADDITIONAL ORDERING AND PRODUCT INFORMATION, PLEASE VISIT THE ENHANCED PLASTIC WEB SITE AT: www.national.com/
mil
Note 3: Refer to package details under Physical Dimensions
© 2011 National Semiconductor Corporation
200939
200939 Version 5 Revision 9
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Print Date/Time: 2011/09/23 14:00:21
LM5007EP Enhanced Plastic High Voltage (80V) Step Down Switching Regulator
OBSOLETE
September 23, 2011
LM5007EP Enhanced Plastic
Connection Diagram
20093902
8-Lead MSOP, LLP
Typical Application Circuit and Block Diagram
20093901
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200939 Version 5 Revision 9
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Pin
Name
1
SW
Switching Node
Description
Power switching node. Connect to the LC output filter.
Application Information
2
BST
Boost Boot–strap capacitor input
An external capacitor is required between the BST
and the SW pins. A 0.01uF ceramic capacitor is
recommended. An internal diode between Vcc and
BST completes the Buck gate drive bias network.
3
RCL
Current Limit OFF time programming pin
Toff = 10-5 / (0.59 + (FB / 7.22 x 10− 6 x RCL))
A resistor between this pin and RTN determines the
variation of off time, along with the FB pin voltage, per
cycle while in current limit. The off time is preset to
17uS if FB =0V and decreases as the FB pin voltage
increases.
4
RTN
Circuit Ground
5
FB
Feedback Signal from Regulated Output
This pin is connected to the inverting input of the
internal regulation comparator. The regulation
threshold is 2.5V.
6
RON
On time set pin
Ton = 1.42 x 10-10 RON / Vin
A resistor between this pin and Vin sets the switch on
time as a function of Vin. The minimum recommended
on time is 300ns at the maximum input voltage.
7
Vcc
Output from the internal high voltage bias regulator. If an auxiliary voltage is available to raise the voltage
VCC is nominally regulated to 7 Volts.
on this pin, above the regulation setpoint (7V), the
internal series pass regulator will shutdown, reducing
the IC power dissipation. Do not exceed 14V. This
output provides gate drive power for the internal Buck
switch. An internal diode is provided between this pin
and the BST pin. A local 0.1uF decoupling capacitor
is recommended. Series pass regulator is current
limited to 10mA.
8
Vin
Input supply voltage
Recommended operating range: 9V to 75V
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LM5007EP Enhanced Plastic
Pin Descriptions
LM5007EP Enhanced Plastic
BST to VCC
BST to SW
VCC to GND
All Other Inputs to GND
Lead Temperature (Soldering 4 sec)
Storage Temperature Range
Absolute Maximum Ratings (Note 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
BST to GND
SW to GND (Steady State)
ESD Rating (Note 8)
Human Body Model
Machine Model
80V
94V
-1V
Operating Ratings
80V
14V
14V
-0.3 to 7V
260°C
-55°C to +150°C
(Note 4)
VIN
Junction Temperature
2kV
200V
9V to 75V
−40°C to + 125°C
Electrical Characteristics
Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction Temperature range. VIN = 48V, unless otherwise stated (Note 6).
Symbol
Parameter
Conditions
Min
Typ
Max
Units
6.6
7
7.4
V
Startup Regulator
VCC Reg
VCC Regulator Output
VCC Current Limit
(Note 7)
11
mA
VCC undervoltage Lockout
Voltage (VCC increasing)
6.3
V
VCC Undervoltage Hysteresis
206
mV
VCC Supply
VCC UVLO Delay (filter)
3
µs
Operating Current (ICC)
Non-Switching, FB = 3V
500
675
µA
Shutdown/Standby Current
RON = 0V
100
200
µA
ITEST = 200mA,
VBST −VSW = 6.3V
(Note 9)
0.74
1.34
Ω
4.5
5.5
Switch Characteristics
Buck Switch Rds(on)
Gate Drive UVLO (VBST – VSW) Rising
3.4
Gate Drive UVLO Hysteresis
400
V
mV
Breakdown Voltage
VIN to Ground
TJ = 25°C
TJ = -40°C to +125°C
80
76
V
Breakdown Voltage
BST to VCC
TJ = 25°C
TJ = -40°C to +125°C
80
76
V
Current Limit
Current Limit Threshold
535
725
900
mA
Current Limit Response Time
Iswitch Overdrive = 0.1A Time
to Switch Off
225
ns
OFF time generator (test 1)
FB=0V, RCL = 100K
17
µs
OFF time generator (test 2)
FB=2.3V, RCL = 100K
2.65
µs
On Time Generator
TON -1
Vin = 10V
RON = 200K
2.15
2.77
3.5
µs
TON -2
Vin = 75V
RON = 200K
290
390
490
ns
Remote Shutdown Threshold
Rising
0.45
0.7
1.1
Remote Shutdown Hysteresis
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V
mV
Parameter
Conditions
Min
Typ
Max
Units
Minimum Off Time
Minimum Off Timer
FB = 0V
300
ns
Regulation and OV Comparators
FB Reference Threshold
Internal reference
Trip point for switch ON
FB Over-Voltage Threshold
Trip point for switch OFF
2.445
2.5
V
2.550
2.875
V
100
nA
Thermal Shutdown Temp.
165
°C
Thermal Shutdown Hysteresis
25
°C
MUA Package
200
°C/W
SDC Package
40
°C/W
FB Bias Current
Thermal Shutdown
Tsd
Thermal Resistance
θJA
Junction to Ambient
Note 4: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 5: For detailed information on soldering plastic MSOP and LLP packages, refer to the Packaging Data Book available from National Semiconductor
Corporation.
Note 6: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with TA = TJ = 25°C. All hot and cold
limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
Note 7: The VCC output is intended as a self bias for the internal gate drive power and control circuits. Device thermal limitations limit external loading.
Note 8: The human body model is a 100pF capacitor discharge through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged
directly into each pin. The machine model ESD compliance level for Pin 5 is 150V. The human body ESD compliance level for Pin 7 and 8 is 1000V.
Note 9: For devices procurred in the LLP-8 package the Rds(on) limits are guaranteed by design characterization data only.
the 300ns off time, the switch will turn on again for another on
time period. This switching behavior will continue until the FB
pin voltage reaches the reference voltage level.
The LM5007EP operates in discontinuous conduction mode
at light load currents or continuous conduction mode at heavier load currents. In discontinuous conduction mode, current
through the output inductor starts at zero and ramps up to a
peak value during the buck switch on time and then back to
zero during the off time. The inductor current remains at zero
until the next on time period starts when FB falls below the
internal reference. In discontinuous mode the operating frequency can be relatively low and will vary with load. Therefore
at light loads the conversion efficiency is maintained, since
the switching losses decrease with the reduction in load current and switching frequency. The approximate discontinuous
mode operating frequency can be calculated as follows:
Detailed Operating Description
The LM5007EP Step Down Switching Regulator features all
of the functions needed to implement low cost, efficient, Buck
bias regulators. This high voltage regulator contains an 80V,
0.7A N-Channel Buck Switch. The device is easy to apply and
is provided in the MSOP-8 and the thermally enhanced LLP-8
packages. The regulator is based on a hysteretic control
scheme using an on time inversely proportional to Vin. This
feature allows the operating frequency to remain relatively
constant with load and input voltage variations. The hysteretic
control requires no control loop compensation, while providing very fast load transient response. An intelligent current
limit scheme is implemented in the LM5007EP with forced off
time, after current limit detection, which is inversely proportional to Vout. This current limiting scheme reduces load
current foldback. Additional protection features include: Thermal Shutdown, Vcc undervoltage lockout, Gate drive undervoltage lockout and Max Duty Cycle limiter. The LM5007EP
can be applied in numerous applications to efficiently regulate
step down higher voltage inputs. This regulator is well suited
for 48 Volt Telcom and the new 42V Automotive power bus
ranges.
In continuous conduction mode, current flows continuously
through the inductor and never ramps down to zero. In this
mode the operating frequency is greater than the discontinuous mode frequency and remains relatively constant with load
and line variations. The approximate continuous mode operating frequency can be calculated as follows:
Hysteretic Control Circuit Overview
The LM5007EP is a Buck DC-DC regulator that uses an on
time control scheme. The on time is programmed by an external resistor and varies inversely with line input voltage
(Vin). The core regulation elements of the LM5007EP are the
feedback comparator and the on time one-shot. The regulator
output voltage is sensed at the feedback pin (FB) and is compared to an internal reference voltage (2.5V). If the FB signal
is below the reference voltage, the buck switch is turned on
for a fixed time pulse determined by the line voltage and a
programming resistor (RON). Following the on period the
switch will remain off for at least the minimum off timer period
of 300ns. If the FB pin voltage is still below the reference after
The output voltage (Vout) can be programmed by two external
resistors as shown in Figure 1. The regulation point can be
calculated as follows:
VOUT = 2.5 x (R1 + R2) / R2
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LM5007EP Enhanced Plastic
Symbol
LM5007EP Enhanced Plastic
The feedback comparator in hysteretic regulators depend upon the output ripple voltage to switch the output transistor on
and off at regular intervals. In order for the internal comparator
to respond quickly to changes in output voltage, proportional
to inductor current, a minimum amount of capacitor Equivalent Series Resistance (ESR) is required. A ripple voltage of
25mV to 50mV is recommended at the feedback pin (FB) for
stable operation. In cases where the intrinsic capacitor ESR
is too small, additional series resistance may be added.
For applications where lower output voltage ripple is required
the load can be connected directly to the low ESR output capacitor, as shown in Figure 1. The series resistor (R) will
degrade the load regulation. Another technique for enhancing
the ripple voltage at the FB pin is to place a capacitor in parallel with the feedback divider resistor R1. The addition of the
capacitor reduces the attenuation of the ripple voltage from
the feedback divider
High Voltage Bias Regulator
The LM5007EP contains an internal high voltage bias regulator. The input pin (Vin) can be connected directly to line
voltages from 9 to 75 Volts. The regulator is internally current
limited to 10mA. Upon power up, the regulator is enabled and
sources current into an external capacitor connected to the
Vcc pin. When the voltage on the Vcc pin reaches the regulation point of 7V, the controller output is enabled.
An external auxiliary supply voltage can be applied to the Vcc
pin. If the auxiliary voltage is greater than 7 Volts the internal
regulator will essentially shutoff, thus reducing internal power
dissipation.
20093905
FIGURE 1. Low Ripple Output Configuration
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LM5007EP Enhanced Plastic
20093906
FIGURE 2. Self Biased Configuration
resistor and into the RON terminal is approximately proportional to Vin and used internally to control the on timer. This
scheme of input voltage feed-forward hysteretic operation
achieves nearly constant operational frequency over varying
line and load conditions. The on time equation for the
LM5007EP is :
Over-Voltage Comparator
The over-voltage comparator is provided to protect the output
from overvoltage conditions due to sudden input line voltage
changes or output loading changes. The over-voltage comparator monitors the FB pin versus an internal 2.875V reference (OV_REF). If the voltage at FB rises above OV_REF the
comparator immediately terminates the buck switch on time
pulse.
Ton = 1.42 x 10-10 x RON / VIN
The RON pin of the LM5007EP also provides a shutdown
function which disables the regulator and significantly decreases quiescent power dissipation. By pulling the RON pin
to below 0.7V logic threshold activates the low power shutdown mode. The VIN quiescent current in the shutdown mode
is approximately 100µA internal to the LM5007EP plus the
current in the RON resistor.
On Time Generator and Shutdown
The on time of the LM5007EP is set inversely proportional to
the input voltage by an external resistor connected between
RON and Vin. The RON terminal is a low impedance input biased at approximately 1.5V. Thus the current through the
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LM5007EP Enhanced Plastic
20093907
FIGURE 3. Shutdown Implementation
circuit works in conjunction with an external bootstrap capacitor and an internal high voltage diode. The bootstrap capacitor is charged by VCC through the internal high voltage diode.
A 0.01uF ceramic capacitor connected between the BST pin
and SW pin is recommended.
During each cycle when the Buck switch turns off, the SW pin
is approximately 0V. When the SW pin voltage is low, the
bootstrap capacitor will be charged from Vcc through the internal diode. The minimum off timer, set to 300ns, ensures
that there will be a minimum interval every cycle to recharge
the bootstrap capacitor.
An external re-circulating diode from the SW pin to ground is
necessary to carry the inductor current after the internal Buck
switch turns off. This external diode must be of the Ultra-fast
or Schottky type to reduce turn-on losses and current overshoot. The reverse voltage rating of the re-circulating diode
must be greater than the maximum line input voltage.
Current Limit
The LM5007EP contains an intelligent current limit off timer
intended to reduce the foldback characteristic inherent with
fixed off-time over-current protection. If the current in the Buck
switch exceeds 725mA the present cycle on time is immediately terminated (cycle by cycle current limit). Following the
termination of the cycle a non-resetable current limit off timer
is initiated. The duration of the off time is a function of the
external resistor (RCI) and the FB pin voltage. When the FB
pin voltage equals zero, the current limit off time is internally
preset to 17uS. This condition occurs in short circuit operation
when a maximum amount of off time is required.
In cases of overload (not complete short circuit) the current
limit off time can be reduced as a function of the output voltage
(measured at the FB pin). Reducing the off time with smaller
overloads reduces the amount of foldback and also reduces
the initial start-up time. The current limit off time for a given
FB pin voltage and RCI resistor can be calculated by the following equation:
Thermal Protection
Internal Thermal Shutdown circuitry is provided to protect the
integrated circuit in the event the maximum junction temperature is exceeded. When thermal protection is activated,
typically at 165 degrees Celsius, the controller is forced into
a low power reset state, disabling the output driver. This feature is provided to prevent catastrophic failures from accidental device overheating.
Toff = 10-5 / (0.59 + (VFB / 7.22 x 10-6 x RCL))
Applications utilizing low resistance inductors and/or a low
voltage drop rectifier may require special evaluation at high
line, short circuit conditions. In this special case the preset
17uS (FB = 0V) off time may be insufficient to balance the
inductor volt*time product. Additional inductor resistance, output resistance or a larger voltage drop rectifier may be necessary to balance the inductor cycle volt*time product and
limit the short circuit current.
N - Channel Buck Switch and Driver
The LM5007EP integrates an N-Channel Buck switch and
associated floating high voltage gate driver. This gate driver
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200939 Version 5 Revision 9
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LM5007EP Enhanced Plastic
Typical Performance Characteristics
LM5007EP 10V Output Efficiency
Operational Waveforms
20093908
LM5007EP Operation: VOUT = 10V, VIN = 20V, IOUT = 250mA
CH1: Switch Node, CH2: VOUT (AC), CH4: Inductor Current
FIGURE 4.
20093910
FIGURE 6.
Operational Waveforms
Current Limit VFB vs TOFF
RCL = 50k -600k
20093909
LM5007EP Operation: VOUT = 10V, VIN = 75V, IOUT = 250mA
CH1: Switch Node, CH2: VOUT (AC), CH4: Inductor Current
FIGURE 5.
20093911
FIGURE 7.
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LM5007EP Enhanced Plastic
VIN vs TON
RON = 100k, 200k, 300k
20093912
FIGURE 8.
10V, 400mA Demo Board Bill of Materials
Item
Part Number
Description
Value
C1
C4532X7R2A105M
CAPACITOR, CER, TDK
1µ, 100V
C2
C4532X7R1E156M
CAPACITOR, CER, TDK
15µ, 25V
C3
C1206C104K5RAC
CAPACITOR, CER, KEMET
0.1µ, 50V
C4
C1206C103K5RAC
CAPACITOR, CER, KEMET
0.01µ, 50V
C5
OPEN
UNUSED
D1
MURA110T3
DIODE, 100V, ON SEMI
L1
SLF7045T-101MR60-1
BUCK INDUCTOR, TDK
100µH
R1
CRCW12062003F
RESISTOR
200K
R2
CRCW12061003F
RESISTOR
100K
R3
CRCW12063011F
RESISTOR
3.01K
R4
CRCW12061001F
RESISTOR
1K
R5
CRCW12061R00F
RESISTOR
1
U1
LM5007
REGULATOR, NATIONAL
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200939 Version 5 Revision 9
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LM5007EP Enhanced Plastic
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead MSOP Package
NS Package Number MUA08A
8-Lead LLP Package (4mm x 4mm)
NS Package Number SDC08A
11
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LM5007EP Enhanced Plastic High Voltage (80V) Step Down Switching Regulator
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Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
www.ti.com/audio
Communications and Telecom www.ti.com/communications
Amplifiers
amplifier.ti.com
Computers and Peripherals
www.ti.com/computers
Data Converters
dataconverter.ti.com
Consumer Electronics
www.ti.com/consumer-apps
DLP® Products
www.dlp.com
Energy and Lighting
www.ti.com/energy
DSP
dsp.ti.com
Industrial
www.ti.com/industrial
Clocks and Timers
www.ti.com/clocks
Medical
www.ti.com/medical
Interface
interface.ti.com
Security
www.ti.com/security
Logic
logic.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Power Mgmt
power.ti.com
Transportation and Automotive www.ti.com/automotive
Microcontrollers
microcontroller.ti.com
Video and Imaging
RFID
www.ti-rfid.com
OMAP Mobile Processors
www.ti.com/omap
Wireless Connectivity
www.ti.com/wirelessconnectivity
TI E2E Community Home Page
www.ti.com/video
e2e.ti.com
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