Texas Instruments UCC3806QTR, UCC3806Q, UCC3806N, UCC3806J, UCC3806DWTR Datasheet

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UCC1806

UCC2806

UCC3806

Low Power, Dual Output, Current Mode PWM Controller

FEATURES

•BiCMOS Version of UC1846 Families

•1.4mA Maximum Operating Current

•100 A Maximum Startup Current

•1.0A Peak Output Current

•125nsec Circuit Delay

•Easier Parallelability

•Improved Benefits of Current Mode Control

DESCRIPTION

The UCC1806 family of BiCMOS PWM controllers offers exceptionally improved performance with a familiar architecture. With the same block diagram and pinout of the popular UC1846 series, the UCC1806 line features increased switching frequency capability while greatly reducing the bias current used within the device. With a typical startup current of 50 A and a well defined voltage threshold for turn-on, these devices are favored for applications ranging from off-line power supplies to battery operated portable equipment. Dual high current, FET driving outputs and a fast current sense loop further enhance device versatility.

All the benefits of current mode control including simpler loop closing, voltage feed-forward, parallelability with current sharing, pulse-by-pulse current limiting, and push-pull symmetry correction are readily achievable with the UCC1806 series.

(continued)

BLOCK DIAGRAM
SYNC	10						13	VC
		4.4V		1.5V
RT	9						11	AOUT
		OSC
CT	8	LO			Q		14	BOUT
					T
				R QB
CS–	3	3X		S1	QB		12	GND
CS+	4			S2	SHUTDOWN
		–		COMP
					LOCK OUT
			0.5V	120 A
		+
NI	5
		EA					1	CURLIM
INV	6
COMP	7			S1	R	0.35V
				Q	Q
		7.0V		S2 R	S		16	SHUTDOWN
						1.00V	200k
VIN	15			S	200 A
				Q	CURRENT LIMIT
				R	RESTART
		7.5V			UNDER VOLTAGE LOCKOUT
		15V
			5.1V	4.25V			2	VREF
		REFERENCE		REFERENCE LOW
		REGULATOR

Pin numbers refer to DIL-16 package.

UDG-99035

SLUS272A - FEBRUARY 2000

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, Low Impedance (Pin 15) . . . . . . . . . . . . . +15V Supply Current, High Impedance (Pin 15) . . . . . . . . . . . +25mA Output Supply Voltage (Pin 13) . . . . . . . . . . . . . . . . . . . . . +18V Output Current, Continuous Source or Sink . . . . . . . . . ± 200mA Output Current, Gate Drive. . . . . . . . . . . . . . . . . . . . . . ± 500mA Analog Input Voltage (Pin 3, 4, 5, 6, 16) . . − 0.3V to +VIN +0.3V Sync Output Current (Pin 10) . . . . . . . . . . . . . . . . . . . . . ± 30mA Error Amplifier Output Current (Pin 7) . +10mA/− (Self Limiting) Power Dissipation at TA = 25°C (Note 3). . . . . . . . . . . 1000mW Power Dissipation at TC = 25°C (Note 3). . . . . . . . . . . 2000mW Storage Temperature Range . . . . . . . . . . . . . . 65°C to +150° C Lead Temperature (soldering, 10 seconds) . . . . . . . . . . +300° C

Note 1. All voltages are with respect to Ground, Pin 12.

Note 2. Currents are positive into, negative out of the specified terminal.

Note 3. Consult packaging section of databook for thermal limitations and considerations of package.

Note 4. Pin numbers refer to DIL-16 package.

UCC1806

UCC2806

UCC3806

DESCRIPTION (continued)

These devices are available with multiple package options for both through-hole and surface mount applications; and in commercial, industrial, and military temperature ranges. Contact factory for availability.

The UCC1806 is specified for operation from –55°C to +125°C, the UCC2806 is specified for operation from –40°C to +85°C, and the UCC3806 is specified for operation from 0°C to +70°C. The part is available in DIP and SOIC packages.

CONNECTION DIAGRAMS

DIL-16 (Top View)

J or N, DW PACKAGE

PLCC-20, LCC-20 (Top View)

Q, L PACKAGE

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = –55°C to +125°C for the

UCC1806, − 40°C to +85°C for the UCC2806, and 0°C to +70°C for the UCC3806; V = 12V, R = 33k, CT = 330pF,

IN T

CBYPASS on VREF = 0.01µ F, TA = TJ.

PARAMETER	TEST CONDITION	UCC1806 / UCC2806				UCC3806				UNITS
		MIN	TYP	MAX	MIN		TYP		MAX
Reference Section
Output Voltage	TJ = 25°C, IO = 0.2mA	5.02	5.10	5.17	5.00		5.10		5.20	V
Load Regulation	0.2mA < IO < 5mA		3	25			3		25	mV
Total Output Variation	Line, Load, Temperature (Note 7)	− 150		150	− 150				150	mV
Output Noise Voltage	10Hz ≤ f ≤ 10kHz, TJ = 25°C		70				70			µ V
	(Note 5)
Long Term Stability	TA = 125°C, 1000 Hours (Note 5)		5	25			5		25	mV
Output Short Circuit		− 10		− 30	− 10				− 30	mA

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UCC1806

UCC2806

UCC3806

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = –55°C to +125°C for the

UCC1806, − 40°C to +85°C for the UCC2806, and 0°C to +70°C for the UCC3806; V = 12V, R = 33k, CT = 330pF,

IN T

CBYPASS on VREF = 0.01µ F, TA = TJ.

PARAMETER	TEST CONDITION	UCC1806 / UCC2806				UCC3806				UNITS
		MIN	TYP	MAX	MIN		TYP		MAX
Oscillator Section
Initial Accuracy	TJ = 25° C	42	47	52	42		47		52	kHz
Temperature Stability	TMIN < TA < TMAX (Note 5)		2				2			%
Amplitude			2.35				2.35			V
SYNC Delay to Outputs	Pin 8 = 0V, Pin 9 = VREF,		50	125			50		100	ns
	VSYNC = 0.8V to 2.0V
Discharge Current	TJ = 25°C, VPIN 8 = 2.0V		2				2			mA
SYNC, VOL	IOUT = +1mA			0.4					0.4	V
SYNC, VOH	IOUT = –4mA	2.4			2.4					V
SYNC, VIL	Pin 8 = 0V, Pin 9 = VREF			0.8					0.8	V
SYNC, VIH	Pin 8 = 0V, Pin 9 = VREF	2.0			2.0					V
SYNC Input Current		− 1		+1	− 1				+1	µ A
Error Amplifier Section
Input Offset Voltage				5					10	mV
Input Bias Current				− 1					− 1	µ A
Input Offset Current				500					500	nA
Common Mode Range		0		VIN-2	0				VIN− 2	V
Open Loop Gain	VO = 1.0 to 4.0	80	100		80		100			dB
Unity Gain Bandwidth		1			1					MHz
Output Sink Current	VID < –20mV, VPIN 7 = 1.0V	1			1					mA
Output Source Current	VID < 20mV, VPIN 7 = 3.0V	− 80	− 120		− 80		− 120			µ A
Output High Level	VID = –50mV	4.5			4.5					V
Output Low Level	VID = –50mV			0.5					0.5	V
Current Sense Amplifier Section
Amplifier Gain	VPIN 3 = 0V, VPIN 1 = VREF (Notes 3,4)	2.75	3	3.35	2.75		3		3.35	V/V
Maximum Differential Input	VPIN 1 = VREF, VPIN 5 = VREF,	1.1			1.1					V
Signal (VPIN 4 - VPIN 3)	VPIN 6 = 0V
Input Offset Voltage	VPIN 1 = 0.5V, VPIN 7 = OPEN		10	30			10		50	mV
CMRR	VCM = 0 to VIN – 3.5	60			60					dB
PSRR		56			56					dB
Input Bias Current	VPIN 1 = 0.5V, PIN 7 OPEN (Note 3)			− 1					− 1	µ A
Input Offset Current	VPIN 1 = 0.5V, PIN 7 OPEN (Note 3)			1					1	µ A
Delay to Outputs	VPIN 5 = VREF, PIN 6 = 0, PIN 1 = 2.75V,		125	175			125		175	ns
	PIN 4 – PIN 3 = 0 to 1.5V step (Note 6)
Current Limit Adjust Section
Current Limit Offset	VPIN 3 = 0, VPIN 4 = 0, PIN 7 = open	0.40	0.50	0.60	0.40		0.50		0.60	V
Input Bias Current				1					1	µ A
Minimum Latching Current		300	200		300		200			µ A
Maximum Non-Latching			200	80			200		80	µ A
Current
Shutdown Terminal Section
Threshold Voltage		0.94	1.00	1.06	0.9		1.0		1.1	V
Input Voltage Range		0		VIN	0				VIN	V
Delay to Outputs	VPIN 16 = 0 to 1.3V		75	150			75		150	ns

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