UCC28700 datasheet(4/32 Pages) TI1

Part #	UCC28700

Description	Constant-Voltage, Constant-Current Controller With Primary-Side Regulation

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Manufacturer	TI1 [Texas Instruments]

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UCC28700, UCC28701

UCC28702, UCC28703

SLUSB41 – JULY 2012

www.ti.com

ELECTRICAL CHARACTERISTICS

over operating free-air temperature range, VDD = 25 V, RCBC = RNTC = open, -20°C ≤ TA ≤ 125°C, TJ = TA

(unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Bias Supply Input

IRUN

Supply current, run

IDRV = 0, run state

2.1

2.65

mA

IWAIT

Supply current, wait

IDRV = 0, wait state

85

110

µA

ISTART

Supply current, start

IDRV = 0, VVDD = 18 V, start state

1.0

1.5

IFAULT

Supply current, fault

IDRV = 0, fault state

2.1

2.8

mA

Under-Voltage Lockout

VVDD(on)

VDD turn-on threshold

VVDD low to high

19

21

23

V

VVDD(off)

VDD turn-off threshold

VVDD high to low

7.7

8.1

8.45

VS Input

VVSR

Regulating level

Measured at no-load condition, TJ = 25°C

4.01

4.05

4.09

V

VVSNC

Negative clamp level

IVS = -300 µA, volts below ground

190

250

325

mV

IVSB

Input bias current

VVS = 4 V

-0.25

0

0.25

µA

CS Input

VCST(max) Max CS threshold voltage

VVS = 3.7 V

(1)

715

750

775

mV

VCST(min)

Min CS threshold voltage

VVS = 4.35 V

(1)

230

250

270

KAM

AM control ratio

VCST(max) / VCST(min)

2.75

3.0

3.15

V/V

constant-current regulating

VCCR

CC regulation constant

310

319

329

mV

level

Line compensating current

KLC

IVSLS = -300 µA, IVSLS / current out of CS pin

23

25

28

A/A

ratio

TCSLEB

Leading-edge blanking time

DRV output duration, VCS = 1 V

195

235

275

ns

DRV

IDRS

DRV source current

VDRV = 8 V, VVDD = 9 V

20

25

mA

RDRVLS

DRV low-side drive resistance

IDRV = 10 mA

6

12

Ω

VDRCL

DRV clamp voltage

VVDD = 35 V

14

16

V

RDRVSS

DRV pull-down in start state

150

200

230

k

Ω

Timing

fSW(max)

Maximum switching frequency VVS = 3.7 V

(1)

120

130

140

kHz

fSW(min)

Minimum switching frequency

VVS = 4.35 V

(1)

875

1000

1100

Hz

TZTO

Zero-crossing timeout delay

1.8

2.1

2.45

µs

(1)

These devices automatically vary the control frequency and current sense thresholds to improve EMI performance, these threshold

voltages and frequency limits represent average levels.

4

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Product Folder Link(s): UCC28700, UCC28701 UCC28702, UCC28703

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