LM5117PMH/NOPB National Semiconductor, LM5117PMH/NOPB Datasheet - Page 29

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LM5117PMH/NOPB

Manufacturer Part Number
LM5117PMH/NOPB
Description
IC BUCK CONTROLLER 20-TSSOP
Manufacturer
National Semiconductor
Series
-r
Datasheet

Specifications of LM5117PMH/NOPB

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
530kHz
Duty Cycle
95%
Voltage - Supply
5.5 V ~ 65 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 125°C
Package / Case
20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
The LM5117 also can be configured as a constant voltage
and constant current regulator, known as CV+CC regulator.
In this configuration, there is much less variation in the current
limiting as compared to peak cycle-by-cycle current limiting of
the inductor current. The LMV431 and the PNP transistor cre-
ate a voltage-to-current amplifier in the current loop. This
amplifier circuitry does not affect the normal operation when
FIGURE 21. Constant Voltage Regulator with Accurate Current Limit
FIGURE 22. Current Limit Comparison
29
the output current is less than the current limit set-point. When
the output current is greater than the set-point, the PNP tran-
sistor sources a current into C
slope of emulated inductor current ramp until the output cur-
rent is less than or equal to the current limit set-point. See
Figure 21
and
301432145
Figure
22.
RAMP
and increases the positive
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30143283

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