UCS1700S

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 10

www.unisonic.com.tw

QW-R103-135.B



PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

32

V

Input Voltage to FB Pin

-0.3 ~ 6.5

V

Input Voltage to CS Pin

-0.3 ~ 6.5

V

Junction Temperature

+150

°C

Operating Temperature

-40 ~ +125

°C

Storage Temperature

-50 ~ +150

°C

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.



OPERATING RANGE

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

10 ~ 24

V

51 ~ 510

Ω



PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX UNIT

SUPPLY SECTION

Start Up Current

2

15

μA

Supply Current with Switch

2.2

5.5

mA

29

30

32

V

UNDER-VOLTAGE LOCKOUT SECTION

Start Threshold Voltage

18

20

22

V

Min. Operating Voltage

6.5

8

9.5

V

CONTROL SECTION

Feedback Source Current

240

uA

5.4

V

Burst-Mode Out FB Voltage

1.8

V

Burst-Mode Enter FB Voltage

1.6

V

Normal Initial

60

65

70

kHz

Switching Frequency

Burst mode Base

Frequency

20

kHz

Duty Cycle

70

80

90

%

Frequency Hopping

-9

+9

%

10

%

Frequency Variation vs. Temperature Deviation

T=-40 ~ 110°C

10

%

Soft-Start Time

5

ms

PROTECTION SECTION

OVP Threshold

25

27

28

V

OLP Threshold

4.2

V

Delay Time Of OLP

60

88

120

ms

OTP Threshold

140

°C

CURRENT LIMITING SECTION

Leading Edge Blanking Time

200

350

550

nS

Peak Current Limitation

0.92

V

Threshold Voltage For Valley

0.73

0.79

0.85

V

POWER MOS-TRANSISTOR SECTION

Drain-Source Breakdown Voltage

700

V

Turn-on voltage between gate and source

2

4

V

Drain-Source Diode Continuous Source Current

0.85

A

Static Drain-Source On-State Resistance

7.0

Ω

Notes: 1. Pulse Test: Pulse width ≤ 300μs, Duty cycle ≤ 2%.

2. Essentially independent of operating temperature.