＜MFT＞

RT8Ｈ094Ｃ

Under development＊This product is under development and may change at a later date.
LED driver circuit with UVLODESCRIPTION

Unit：mmOUTLINE DRAWING

RT8H094C is composed by NPN transistors,PNP transistors

2.8

parts or time necessary for completion.
RT8H094C constitutes the LED driver circuit. The voltage

2.8

detected by the CSP terminal, and the LED current isadjusted by comparing it with the built-in voltage of 0.2V.

1.5

①094

rise of the resistor RCS connected to he GND side is0.95 0.95

0.65

③

The off-time can be set by connecting an external resistor⑥④malfunction at 4V or less and thermal shutdown function.

0～0.1

0.81

It is also has a built-in UVLO function to prevent

FEATURES●Miniaturization of a set.

0.12

1.1

and capacitor to the CT terminal.

0.65

0.33

and resistors.It can miniaturization of a set and reduce

PIN CONFIGURATION●External setting of a switch-off time is possible.
with the switch-off time setting terminals (CT).
●Built-on UVLO function and thermal shutdown function.

①OUT

⑥CSP

②VCC

⑤GND

③CSM

④CT

APPLICATION●LED driver circuit

BLOCK DIAGRAM
VCC
8.0V

Oscillator

CT

Overheatprotection

UVLO

OUT

OSC CompSQR

0.20V

CSP

CS CompLatch circuit(R has priority)

GND

CSM

230608

＜MFT＞

RT8Ｈ094Ｃ

Under development＊This product is under development and may change at a later date.
LED driver circuit with UVLO
ABSOLUTE MAXIMUM RATINGS (Ta＝25℃)
SymbolParameter
Conditions
Supply voltage
VCC
IOUT
Output current
PdInternal power dissipation
Kθ
Thermal deratingTa≧25℃
Tj
Junction temperature
Tstg
Storage temperature(keep dry)
Topr
Operating temperature(keep dry)Ratings
40
10200
1.6
150
－40～150－20～85

Unit
VmAmW
mW/℃℃℃℃

RECOMMENDED OPERATING RANGE
SymbolParameter

VCCfRatings

Unit

Min

Max

Supply voltage range

4.537

V

Frequency range

-200

kHz

ELECTRICAL CHARACTERISTIC (Ta=25℃,VCC=12V unless otherwise noted.)
Designed value
SymbolParameter
Test condition
Min
TypMaxUnit

VCC

Operating supply
voltage range

4.5

1237

V

VCTH1

Operation start voltage

3.91

4.20

4.49

V

VCTH2

Operation stop voltage

3.50

3.85

4.20

V

0.188

0.200

0.212

V

ICC1Circuit current1

CSM:0V, CSP:2V, CT:0V

0.56

0.80

1.04mA

ICC2Circuit current2

CSM:OPEN, CSP:0V, CT:5V

0.56

0.80

1.04mAIBCSP

CSP bias current

CSM:OPEN, CSP:0V/IM, CT:0V-300-1200nA

IBCSM

CSM bias current

CSM:0V/IM, CSP:0.2V, CT:0V-300-1200nA

CSP:0V, CT:0V ⇒ SWEEP(L→H)/IM

2.60

3.10

3.60

V

1.55

1.85

2.15

V

5.95

7.00

8.05

V

0.67

0.75

0.83

V-

5.00

-us-

170-℃

VCSPTH CSM threshold voltage

VTHCT1 CT threshold voltage 1VTHCT2 CT threshold voltage 2
VOSAT1 OUT saturation voltage 1
VOSAT2 OUT saturation voltage 2
TOOFF(※) Switch-off time
TSD(※)

CSM:0V, CSP:3V
CT:VTHCT1 ⇒ SWEEP(H→L)/IM
CSM:OPEN, CSP:0V,
CT:0V, OUT:-5mA
CSM:0V, CSP:0.2V,
CT:0V, OUT:5mA

RCT=47kΩ, CCT=330pF

Thermal shutdown

CHARACTERISTICS

THERMAL DERATING

200

Pd[mW]

Power consumption

250

150
1005000255075100 125 150

Ambient temperrature Ta[℃]230608

＜MFT＞

RT8Ｈ094Ｃ

Under development＊This product is under development and may change at a later date.
LED driver circuit with UVLOAPPLICATION CIRCUIT EXAMPLES

47K

Oscillator

CLDs

LD1LD..

L
680uH
NMOS1

UVLO

VL(on)=V − (VL(o )=V(OSC CompQ)

R

0.20V

Latch circuit(R has priority)

CS Comp

GND1ΩS)CSP RNF

RCSCT

OUT

Overheatprotection

CNF

CCT

330pF

RCT

D10.1uF

LED VF

CVCC
8.0V(About 3.5V)

12V

VCC

CSM

※RNF and CNF is low pass filter.
Please connect yhen you need it.

VCSM(<0.20V)○Setting off-time (t off )The off-time is determined by the time when the charging voltage of the CT terminal resistor R CT
and the capacitor CCT reaches the upper limit of the CT terminal voltage (VCT(H) ) set inside the RT8H094C.
VCC − VCT L
t off = R CT ∙ CCT ∙ ln()
VCC − VCT H(VCT(H) ∶ CT terminal voltage (output HIGH), VCT(L) : CT terminal voltage (output LOW))○Setting on-time (t on )t on =L(I − Imin )VL(on)

Imin refers to the diode current just before the OUT terminal voltage turns from off to on.
The I and Imin arithmetic expressions are as follows.
※The accuracy of Iave is about ±7% only for product variations.
(When the constants of the external components are the above application circuit example.)
VL(off)
VL(off)
VCSPTH
I+IV
Iave = min = CSM −t off
I=Imin = I −
t off
RCS
LR CS
L

TIMING CHART(It is based on the application circuit example)
CSM Voltage(≦0.2V)CSP Voltage

Threhold:About 3V

CT Voltage

Switch-off time

OUT Voltage

Diode current

230608

Keep safety first in your circuit designs!
·ISAHAYA Electronics Corporation puts the maximum effort into making semiconductor products better and more reliable, but there isalways the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage.
Remember to give due consideration to safety when making your circuit designs, with appropriate measures such as (1) placementof substitutive, auxiliary, (2) use of non-farmable material or (3) prevention against any malfunction or mishap.
Notes regarding these materials·These materials are intended as a reference to our customers in the selection of the ISAHAYA products best suited to the customer’sapplication; they don't convey any license under any intellectual property rights, or any other rights, belonging ISAHAYA or third party.

·ISAHAYA Electronics Corporation assumes no responsibility for any damage, or infringement of any third party's rights, originating in the useof any product data, diagrams, charts or circuit application examples contained in these materials.

·All information contained in these materials, including product data, diagrams and charts, represent information on products at the timeof publication of these materials, and are subject to change by ISAHAYA Electronics Corporation without notice due to product improvements
or other reasons. It is therefore recommended that customers contact ISAHAYA Electronics Corporation or an authorized ISAHAYA products
distributor for the latest product information before purchasing product listed herein.
·ISAHAYA Electronics Corporation products are not designed or manufactured for use in a device or system that is used under circumstances inwhich human life is potentially at stake. Please contact ISAHAYA Electronics Corporation or an authorized ISAHAYA products distributor whenconsidering the use of a product contained herein for any specific purposes, such as apparatus or systems for transportation, vehicular,medical, aerospace, nuclear, or undersea repeater use.

·The prior written approval of ISAHAYA Electronics Corporation is necessary to reprint or reproduce in whole or in part these materials.
·If these products or technologies are subject to the Japanese export control restrictions, they must be exported under a license from theJapanese government and cannot be imported into a country other than the approved destination. Any diversion or re-export contrary tothe export control laws and regulations of Japan and/or the country of destination is prohibited.
·Please contact ISAHAYA Electronics Corporation or authorized ISAHAYA products distributor for further details on these materials or
the products contained therein.

Jun.2023