PWM5032 PDF даташит
Спецификация PWM5032 изготовлена «Aeroflex Circuit Technology» и имеет функцию, называемую «RadHard High Speed PWM Controller». |
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Детали детали
Номер произв | PWM5032 |
Описание | RadHard High Speed PWM Controller |
Производители | Aeroflex Circuit Technology |
логотип |
19 Pages
No Preview Available ! |
Standard Products
PWM5032 RadHard High Speed PWM Controller
Radiation Tolerant
www.aeroflex.com/PWM
April 22, 2010
FEATURES
❑ Radiation performance
- Total dose 1 Mrad (Si), Dose rate = 50 - 300 rads(Si)/s
- SEL:
Immune to 100 MeV-cm2/mg
- SEU:
Immune up to 20 MeV-cm2/mg
(Upsets found were benign and non-stressful to the PWM or supporting electronic components)
❑ CMOS low power design
❑ Sleep & enable control lines
❑ Optimized for applications: buck, boost, flyback, forward and center tapped push-pull converters
❑ Supports current mode or voltage mode operations
❑ Selectable 50% / 100% duty cycle
❑ Under-Voltage lockout with hysteresis
❑ Dual ±1Amp peak totem pole outputs
❑ 1 MHz maximum – user selectable
❑ Low RO error amp
❑ Auxiliary op amp with shut down pin
❑ Power OK indicator
❑ PWM5034 - Same as PMW5032 except straight leads
❑ Designed for commercial, aerospace and high reliability space applications
❑ Ceramic 24-lead, hermetic package, .6L x .3W x .13H
- PWM5032 Gull Wing leads
- PWM5034 Straight leads
- Weight: 1.2 g max
❑ Evaluation board available for test and evaluation. See Aeroflex Application Note AN5031-1
❑ Available on DSCC SMD 5962-06251
NOTE: Aeroflex Plainview does not currently have a DSCC Certified Radiation Hardened Assurance Program
Developed in Partnership with JHU/APL and the Technology Application Group for the
Mars Technology Program; Part of NASA’s Mars Exploration Program
OVERVIEW AND GENERAL OPERATION
The chip is a fixed frequency Pulse Width Modulator based on the industry standard UC1843x Series with significant
enhancements in performance and functionality. The chip operates in either the voltage or current mode and can support a
wide variety of converter topologies.
Radiation hardened by design techniques ensure the chip’s outstanding radiation tolerance (>1MRads) while reducing
operating current by more than an order of magnitude over comparable parts.
The PWM5032 provides an under voltage lockout feature with hysteresis that also provides an output to indicate Power is
OK. An input called Sleep is used to power down the entire chip, the Enable input is used to shut down the
Oscillator / Output Drives, and the Soft input drives the Output to zero. There is also a signal input called ENAUX that is
used to disable the output to the auxiliary op-amp.
The dual output drivers are designed using a Totem Pole output capable of sinking and sourcing 50mA constant current and
peak currents up to 1 Amp to support a large variety of Power MOSFETs.
Additional features that boost the appeal and utility of the part are:
◆ Dual break-before-make Totem Pole output stage is employed that virtually eliminates cross conduction and current
shoot through
◆ Logic level input that allows the user to select either 50% or 100% maximum duty cycle operation
◆ Improved oscillator stage that vastly increases waveform linearity and reduces output voltage error
◆ Uncommitted on-board op-amp which can be used for signal conditioning, pulse feedback, or any other user defined
purpose
SCD5031 Rev P
No Preview Available ! |
VREF
11
VCC
1,24
PWROK SLEEP
10 3
EN
17
50%
2
Undervoltage
Lockout
Cset
Rset
8
9
SOFT 7
Comp 4
2.5V
VFB 5
Isense 6
Reference
Internal Bias
Internal Enable /
Shutdown Control
Logic & Control
Functions
Oscillator
2R
1.4V
Error Amp
R
Current Sense
Comparators
SQ
RQ
1V
Duty Cycle
Limiting
(50% or 100%)
Output
Drive
Uncommitted
Op-Amp
12
VEE
15
AOUT
16 14
13
ENAUX PIN NIN
DRVP
22,23
OUTA
21
OUTB
20
18,19
DRVN
SCD5031 Rev P 4/22/10
FIGURE 1 – Block Diagram
2
Aeroflex Plainview
No Preview Available ! |
PWM5032 PWM PIN DESCRIPTION
PIN # SIGNAL NAME
FUNCTION DESCRIPTION
1 VCC
24
Logic Power
2 50%
Input selects maximum duty cycle (50% or 100%). Logic ''1'' selects 50% max duty cycle
and Output B is the complement of Output A. Logic ''0'' selects 100% and Output A is
in-phase with Output B.
3
SLEEP
This Input shuts down all functions on chip when asserted (Active Hi)
4
COMP
Output of the error amplifier. Place compensation network from this pin to VFB to stabilize
converter.
5 VFB
Negative Input to the error amplifier
6
ISENSE
Input Current sense pin used for current mode control
7
SOFT
This High impedance Input is used to limit the error amplifier output voltage. Applying an
RC circuit to this pin provides the standard softstart function. Pull the pin to ground to force
zero duty cycle. This input is internally shorted to ground when Enable (pin 17) is low or
Sleep (pin 3) is high or an Under Voltage is detected.
8
CSET
Works with Rset to establish oscillator free running frequency. Place cap from this Input pin
to ground. Can synchronize oscillator by overdriving this pin with an external frequency
source.
9
RSET
Works with Cset to establish oscillator free running frequency. Place resistor from this Input
pin to ground.
10
PWROK
Logical output of UV lockout circuit -- logic ''1'' indicates chip has valid Vcc
11 VREF Buffered 3V Output reference voltage
12 VEE
Logic Ground
13 NIN
Auxiliary Op-Amp Inverting Input
14 PIN
Auxiliary Op-Amp Non-Inverting Input
15
AOUT
Auxiliary Op-Amp Output (Short circuit protected)
16
ENAUX
Input Enable of Auxiliary Op-Amp (Active Hi)
17 EN
Logic Input that enables the oscillator and output drivers. Reference voltage remains valid
(Active Hi).
18
DRVN
Output stage negative rail
19
20
OUT B
Totem pole Output B
21
OUT A
Totem pole Output A
22 DRVP Output stage positive rail
23
SCD5031 Rev P 4/22/10
3
Aeroflex Plainview
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Номер в каталоге | Описание | Производители |
PWM5031 | RadHard High Speed PWM Controller | Aeroflex Circuit Technology |
PWM5032 | RadHard High Speed PWM Controller | Aeroflex Circuit Technology |
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