SLUSG05 Data sheet

SLUSG05 March 2025 UC2843L-Q1 , UC2844L-Q1 , UC2845L-Q1

PRODUCTION DATA

6.5 Electrical Characteristics

Unless otherwise stated, these specifications apply for T_A = –40°C to 125°C, T_A = T_J; V_CC = 15V⁽⁴⁾; R_T = 10kΩ; C_T = 3.3nF.

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
REFERENCE
	Output voltage	T_J = 25°C, I_O = 1mA	4.95	5	5.05	V
	Line regulation	12V ≤ V_IN ≤ 25V		6	20	mV
	Load regulation	1mA ≤ I_O ≤ 20mA		6	25	mV
	Temperature stability	See ⁽¹⁾⁽⁶⁾		0.2	0.4	mV/°C
	Total output variation	Line, Load, Temperature	4.9		5.1	V
	Output noise voltage	10Hz ≤ f ≤ 10kHz; T_J = 25°C⁽¹⁾		50		µV
	Long-term stability	T_A = 125°C, 1000hrs⁽¹⁾		5	25	mV
	Output short circuit		–30	–100	–180	mA
OSCILLATOR
	Initial accuracy	T_J = 25°C⁽⁵⁾	47	52	57	kHz
	Voltage stability	12V ≤ V_CC ≤ 25V		0.2	1	%
	Temperature stability	T_MIN ≤ T_A ≤ T_MAX⁽¹⁾		5		%
	Amplitude	V_RT/CT peak to peak⁽¹⁾		1.7		V
	Discharge current	V_RT/CT = 2V⁽⁷⁾		8.3		mA
ERROR AMPLIFIER
	Input voltage	V_COMP = 2.5V	2.45	2.5	2.55	V
	Input bias current			–0.3	–1	µA
	Input bias current			–0.3	–2	µA
A_VOL	Open-loop gain	2V ≤ V_O ≤ 4V	65	90		dB
	Unity gain bandwidth	T_J = 25°C⁽¹⁾	0.7	1		MHz
CMRR	Common mode rejection ratio	12V ≤ V_CC ≤ 25V	60	70		dB
	Output sink current	V_FB = 2.7V, V_COMP = 1.1V	2	6		mA
	Output source current	V_FB = 2.3V, V_COMP = 5V	–0.5	–0.8		mA
	V_OUT high	V_FB = 2.3V, R_L = 15kΩ to ground	5	6		V
	V_OUT low	V_FB = 2.7V, R_L = 15kΩ to VREF		0.7	1.1	V
CURRENT SENSE
	Gain	See ⁽²⁾⁽³⁾	2.85	3	3.15	V/V
	Maximum input signal	V_COMP = 5V⁽²⁾	0.9	1	1.1	V
PSRR	Power supply rejection ratio	12V ≤ V_CC ≤ 25V⁽²⁾		70		dB
	Input bias current			–2	–10	µA
	Delay to output	V_ISENSE = 0V to 2V⁽¹⁾		100	200	ns
OUTPUT
	Output low level	I_SINK = 20mA		0.05	0.11	V
	Output low level	I_SINK = 200mA		0.55	1.1	V
	Output high level	I_SOURCE = 20mA	13.2	13.6		V
	Output high level	I_SOURCE = 200mA	13.1	13.5		V
	Rise time	T_J = 25°C, C_L = 1nF⁽¹⁾		25	75	ns
	Fall time	T_J = 25°C, C_L = 1nF⁽¹⁾		25	75	ns
	UVLO saturation	V_CC = 5V, I_SINK = 10mA		0.7	1.2	V
UNDERVOLTAGE LOCKOUT
	Start threshold	UC2844L-Q1	15	16	17	V
	Start threshold	UC2843L-Q1, UC2845L-Q1	7.8	8.4	9
	Minimum operation voltage after turn on	UC2844L-Q1	9	10	11	V
	Minimum operation voltage after turn on	UC2843L-Q1, UC2845L-Q1	7	7.6	8.2
PWM
	Maximum duty cycle	UC2843L-Q1	92	96	100	%
		UC2844L-Q1, UC2845L-Q1	46	48	50	%
	Minimum duty cycle				0	%
TOTAL STANDBY CURRENT
	Start-up current			0.25	0.5	mA
	Operating supply current	V_FB = V_ISENSE = 0V		11	15	mA
	V_CC Zener voltage	I_CC = 25mA	36			V

(1) Ensured by design, but not 100% production tested.

(2) Parameter measured at trip point of latch with V_FB = 0V.

(3) Gain defined as: A = ΔV_COMP / ΔV_ISENSE; 0V ≤ V_ISENSE ≤ 0.8V.

(4) Adjust V_CC above the start threshold before setting at 15V.

(5) Output frequency is one half oscillator frequency.

(6) Temperature stability, sometimes referred to as average temperature coefficient, is described by: Temperature stability = ( V_REF(max) – V_REF(min)) / (T_J(max) – T_J(min) ). V_REF(max) and V_REF(min) are the maximum and minimum reference voltage measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in temperature.

(7) This parameter is measured with R_T = 10kΩ to V_REF. This contributes approximately 300µA of current to the measurement. The total current flowing into the RT/CT pin is approximately 300µA higher than the measured value.