SLUS168 Data sheet | 德州仪器 TI.com.cn

SLUS168F April 1999 – July 2025 UCC2808-1 , UCC2808-2 , UCC3808-1 , UCC3808-2

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5.5 Electrical Characteristics

T_A = 0°C to 70°C for the UCC3808-x, –40°C to 85°C for the UCC2808-x and –55°C to 125°C for the UCC1808-x, VDD = 10V⁽¹⁾, 1μF capacitor from VDD to GND, R = 22kΩ, C = 330pF, T_A = T_J, (unless otherwise specified)

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
OSCILLATOR SECTION
	Oscillator frequency		175	194	213	kHz
	Oscillator amplitude/VDD⁽²⁾		0.44	0.5	0.56	V/V
ERROR AMPLIFIER SECTION
	Input voltage	COMP = 2V	1.95	2	2.05	V
	Input bias current		–1		1	μ A
	Open-loop voltage gain		60	80		dB
	COMP sink current	FB = 2.2V, COMP = 1V	0.3	2.5		mA
	COMP source current	FB = 1.3V, COMP = 3.5V	–0.25	–0.5		mA
PWM SECTION
	Maximum duty cycle	Measured at OUTA or OUTB	48%	49%	50%
	Minimum duty cycle	COMP =0V			0%
CURRENT SENSE SECTION
	Gain⁽³⁾		1.9	2.2	2.5	V/V
	Maximum input signal	COMP = 5V⁽⁴⁾	0.45	0.5	0.55	V
	CS to output delay	COMP = 3.5V, CS from 0mV to 600mV		100	200	ns
	CS source current		–200			nA
	Over current threshold		0.7	0.75	0.8	V
	COMP to CS offset	CS = 0V	0.35	0.8	1.2	V
OUTPUT SECTION
	OUT low level	I = 100mA		0.5	1	V
	OUT high level	I = – 50mA, VDD – OUT		0.5	1	V
	Rise time	C_L =1nF		25	60	ns
	Fall time	C_L = 1nF		25	60	ns
UNDERVOLTAGE LOCKOUT SECTION
	Start threshold	UCCx808-1⁽¹⁾	11.5	12.5	13.5	V
	Start threshold	UCCx808-2	4.1	4.3	4.5	V
	Minimum operating voltage after start	UCCx808-1	7.6	8.3	9	V
	Minimum operating voltage after start	UCCx808-2	3.9	4.1	4.3	V
	Hysteresis	UCCx808-1	3.5	4.2	5.1	V
	Hysteresis	UCCx808-2	0.1	0.2	0.3	V
SOFT-START SECTION
	COMP rise time	FB = 1.8V, rise from 0.5V to4V		3.5	20	ms
OVERALL SECTION
	Start-up current	VDD < start threshold		130	260	µA
	Operating supply current	FB = 0V, CS = 0V ⁽⁵⁾⁽¹⁾		1	2	mA
	VDD zener shunt voltage	IDD = 10mA⁽⁶⁾	13	14	15	V

(1) Does not include current in the external oscillator network.

(2) Measured at RC. Signal amplitude tracks VDD.

(3) Gain is defined by: Equation 1

(4) Parameter measured at trip point of latch with FB at 0V.

(5) For UCCx808 – 1, set VDD above the start threshold before setting at 10V

(6) Start threshold and Zener shunt threshold track one another.

Equation 1.

A = \frac{{∆ V}_{C O M P}}{{∆ V}_{C S}}, 0 \leq V_{C S} \leq 0.4 V