SLUSDD4 Data sheet

SLUSDD4B April 2019 – December 2020 UC1843B-SP

PRODUCTION DATA

6.5 Electrical Characteristics

V_CC = 15 V⁽¹⁾, R_T = 10 kΩ, C_T = 3.3 nF, T_A = T_J = –55°C to 125°C (unless otherwise noted)

PARAMETER		TEST CONDITIONS		MIN	TYP	MAX	UNIT
REFERENCE
	Output voltage	T_J = 25°C, I_O = 1 mA		4.85	5	5.1	V
	Line regulation	V_IN = 12 to 25 V			6	20	mV
	Load regulation	I_O = 1 to 20 mA			6	25	mV
	Temperature stability⁽²⁾⁽³⁾				0.2	0.4	mV/°C
	Total output variation⁽²⁾	Over line, load, and temperature		4.85		5.1	V
	Output noise voltage	10 Hz ≤ ƒ ≤ 10 kHz, T_J = 25°C			50		μV
	Long-term stability	1000 hours, T_A = 125°C⁽²⁾			5	25	mV
	Short-circuit output current			–30	–100	–180	mA
OSCILLATOR
	Initial accuracy	T_J = 25°C⁽⁴⁾		47	52	57	kHz
	Voltage stability	V_CC = 12 to 25 V			0.2%	1%
	Temperature stability	T_J = –55°C to 125°C⁽²⁾			5%
	Amplitude peak-to-peak	V pin 4⁽²⁾			1.7		V
	Discharge current	V pin 4 = 2 V⁽⁵⁾	T_J = 25°C	7.8	8.3	8.8	mA
	Discharge current	V pin 4 = 2 V⁽⁵⁾	T_J = Full range	7.5		8.8	mA
ERROR AMPLIFIER
	Input voltage	V_Comp = 2.5 V		2.45	2.50	2.55	V
	Input bias current				–0.3	–1	μA
	Open-loop voltage gain	V_O = 2 to 4 V		65	90		dB
	Unity-gain bandwidth	T_J = 25°C⁽²⁾		0.7	1		MHz
	PSRR	V_CC = 12 to 25 V		60	70		dB
	Output sink current	V_FB = 2.7 V, V_Comp = 1.1 V		2	6		mA
	Output source current	V_FB = 2.3 V, V_Comp = 5 V		–0.5	–0.8		mA
	High-level output voltage	V_FB = 2.3 V, R_L = 15 kΩ to ground		5	6		V
	Low-level output voltage	V_FB = 2.7 V, R_L = 15 kΩ to V_REF			0.7	1.1	V
CURRENT SENSE
	Gain⁽⁶⁾⁽⁷⁾			2.85	3	3.15	V/V
	Maximum input signal	V_Comp = 5 V⁽⁶⁾		0.9	1	1.1	V
	PSRR	V_CC = 12 to 25 V⁽⁶⁾			70		dB
	Input bias current				–2	–10	μA
	Delay to output	V_ISENSE = 0 to 2 V⁽²⁾			150	300	ns
OUTPUT
	Output low-level voltage	I_SINK = 20 mA			0.1	0.4	V
	Output low-level voltage	I_SINK = 200 mA			1.5	2.2	V
	Output high-level voltage	I_SOURCE = –20 mA		13	13.5		V
	Output high-level voltage	I_SOURCE = –200 mA		12	13.5		V
	Rise time	C_L = 1 nF, T_J = 25°C⁽²⁾			50	150	ns
	Fall time	C_L = 1 nF, T_J = 25°C⁽²⁾			50	150	ns
	UVLO saturation	V_CC = 5 V, I_SINK = 10 mA			0.7	1.2	V
UNDERVOLTAGE LOCKOUT
	Start threshold			7.8	8.4	9	V
	Minimum operation voltage after turnon			7	7.6	8.2	V
PWM
	Maximum duty cycle			94%	96%	100%
	Minimum duty cycle					0%
TOTAL STANDBY CURRENT
	Start-up current				0.3	0.5	mA
	Operating supply current	V_FB = V_ISENSE = 0 V			11	17	mA
	V_CC Zener voltage	I_CC = 25 mA		30	34		V

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

(2) Parameters ensured by design and/or characterization, if not production tested.

(3) Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
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.

(4) Output frequency equals oscillator frequency.

(5) This parameter is measured with R_T = 10 kΩ to V_REF. This contributes approximately 300 μA of current to the measurement. The total current flowing into the R_T or C_T pin will be approximately 300 μA higher than the measured value.

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

(7) Gain defined as: G = ΔV_Comp / ΔV_ISENSE; V_ISENSE = 0 to 0.8 V.