Texas Instruments TPS54810 Typical Characteristics, Output Voltage Regulation Error Amplifier

www.ti.com	TPS54810
	SLVS420B − MARCH 2002 − R EVISED FEBRUARY 2005
	TYPICAL CHARACTERISTICS
DRAIN-SOURCE	INTERNALLY SET
ON-STATE RESISTANCE	OSCILLATOR FREQUENCY
vs	vs
JUNCTION TEMPERATURE	JUNCTION TEMPERATURE

mΩ	60
		VI = 5 V,
−	50	IO = 8 A
Reststance
	40
On-State	30
	20
Source
	10
Drain
	0−40
		−15	10	35	60	85	110	135
		TJ − Junction Temperature − °C

− kHz	750
Frequency	650
		SYNC ≥ 2.5 V
	550
Oscillator
	450
Set
		SYNC ≤ 0.8 V
f − Internally	350
	250
	−40	0	25	85	125
		TJ − Junction Temperature − °C

Figure 1 Figure 2

f − Externally Set Oscillator Frequency − kHz

	EXTERNALLY SET						VOLTAGE REFERENCE						DEVICE POWER LOSSES
	OSCILLATOR FREQUENCY
								vs								vs
		vs
	JUNCTION TEMPERATURE						JUNCTION TEMPERATURE					5		LOAD CURRENT
						0.895
800
													TJ = 125°C
												4.5
												4	fs = 700 kHz
700		RT = 68 k			ReferenceVoltage− V	0.893					LossesPower− W
												3.5
600						0.891						3
500												2.5
												2
		RT = 100 k				0.889
					ref						Device
400												1.5						VI = 5 V
					−
						0.887						1
300					V
												0.5
		RT = 180 k
												0
200						0.885							1	2	3	4	5	6	7	8
	0	25	85	125		−40	0	25	85	125		0
−40														IL − Load Current − A
	T − Junction Temperature − °C						T − Junction Temperature − °C
	J						J
		Figure 3						Figure 4							Figure 5

OUTPUT VOLTAGE REGULATION	ERROR AMPLIFIER
vs
INPUT VOLTAGE	OPEN LOOP RESPONSE

INTERNAL SLOW-START TIME

vs

JUNCTION TEMPERATURE

VO− Output Voltage Regulation − V

0.895

0.893

0.891

0.889

0.887

0.885

4.5 4.8 5.1 5.4 5.7

VI − Input Voltage − V

		140				RL = 10 kΩ,			0			3.80
		120							−20
						CL = 160 pF,
												3.65
		100				TA = 25°C			−40		ms
									−60		−	3.50
										Degrees	Slow-Start Time
	Gain − dB	80				Phase			−80			3.35
		60
									−100
										−
		40							−120			3.20
										Phase
						Gain
		20							−140		Internal	3.05
									−160
												2.90
		0							−180
6		−20	10	100	1 k	10 k	100 k	1 M	−200			2.75
		1							10 M
				f − Frequency − Hz

−40	0	25	85	125
	TJ − Junction Temperature − °C

Figure 6 Figure 7 Figure 8

7