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PDF LC5830K Data sheet ( Hoja de datos )
| Número de pieza | LC5830K | |
| Descripción | single IC switching regulator | |
| Fabricantes | SANKEN | |
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LC5830K DATA SHEET
Preliminary Rev.0.3
LC5830K
DATA SHEET Rev.0.3
The contents in this data sheet are preliminary, and
are subject to changes without notice.
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.1
http://www.Datasheet4U.com
1 page  
LC5830K DATA SHEET
Preliminary Rev.0.3
3. Electrical Characteristics
Refer to a specification for contents of details.
The polarity of the electric current value prescribes "sink = +" and "source = -" based on the IC.
Electrical Characteristics of Control Part (MIC)
Valid at VIN = 24 V, TA = –40°C to 125°C, typical values at TA = 25°C; unless otherwise noted
Table.3
Items
Ratings
Symbol
Units
MIN TYP MAX
Conditions
Input Supply Voltage
VIN 6 - 48 V TA=25°C
VIN Undervoltage Lockout Threshold
VIN Undervoltage Lockout
Hysteresis
VIN Pin Supply Current
VIN Pin Shutdown Current
VUVLO
VUVLOHYS
IIN
IINSD
-
-
-
-
5.3 -
150 -
5-
1 10
V VIN increasing
mV VIN decreasing
mA VCS=0.5V, EN=”H”
μA EN shorted to GND
Buck Switch Current Limit
Threshold
Buck Switch On-Resistance
BOOT Undervoltage Lockout
Threshold
ISWLIM 3.0 4.0 5.0
RDB(on)
- 0.25 0.4
VBOOTUV 1.7 2.9 4.3
A
Ω
VBOOT=VIN+4.3V,
TA=25°C, ISW=1A
V VBOOT to VSW increasing
BOOT Undervoltage Lockout
Hysteresis
VBOOTHYS
-
370
-
mV VBOOT to VSW decreasing
Switching Minimum Off-Time
tOFFmin - 110 150
ns VCS=0V
Switching Minimum On-TIme
Selected On-Time
Load Current Sense Regulation
Threshold
Load Current Sense Bias Current
tSWONTIME
tON
800
110 150
1000 1200
VCSREG
ICSBIAS
187.5
-
200
0.9
210
-
ns
ns
VIN=24V, VOUT=12V,
RON=137 kΩ
mV VCS decreasing, SW turns on
μA VCS=0.2V, EN=low
VCC Regulated Output
VCC 5.0 5.3 5.6
V 0mA<ICC<5mA, VIN>6V
VCC Current Limit*
ICCLIM 5 20 -
mA VIN=24V, VCC=0V
Logic High Voltage
Logic Low Voltage
EN Pin Pull-down Resistance
VIH
VIL
RENPD
1.8 -
-
- - 0.4
- 100 -
V VEN increasing
V VEN decreasing
kΩ VEN=5V
Measured while EN = low,
Maximum PWM Dimming
Off-Time
tPWML 10 17
-
during dimming control, and
ms internal references are
powered-on (exceeding tPWML
results in shutdown)
Thermal Shutdown activation
temperature
TSD − 165 − °C
Thermal Shutdown Hysteresis
temperature
TSDHYS
−
25
−
°C
* The internal linear regulator is not designed to drive an external load.
Copy Right: SANKEN ELECTRIC CO., LTD.
Page.5
5 Page 
LC5830K DATA SHEET
Preliminary Rev.0.3
8.2 Enable and Dimming
･Enable terminal
The IC is activated when a logic high signal is applied to the EN (enable) pin. The buck converter ramps up the LED current to
a target level set by RSENSE. When the EN pin is forced from high to low, the buck converter is turned off, but the IC remains
in standby mode for up to 10 ms. If EN goes high again within this period, the LED current is turned on immediately. Active
dimming of the LED is achieved by sending a PWM (pulse-width modulation) signal to the EN pin. The resulting LED
brightness is proportional to the duty cycle ( TON / Period ) of the PWM signal. A practical range for PWM dimming frequency
is between 100 Hz ( Period = 10 ms) and 2 kHz. At a 200 Hz PWM frequency, the dimming duty cycle can be varied from
100% down to 1% or lower.
If EN is low for more than 17 ms, the IC enters shutdown mode to reduce power consumption. The next high signal on EN will
initialize a full startup sequence, which includes a startup delay of approximately 130 μs. This startup delay is not present
during PWM operation. The EN pin is high-voltage tolerant and can be directly connected to a power supply. However, if EN
is higher than the VIN voltageat any time, a series resistor (1 kΩ) is required to limit the current flowing into the EN pin. This
series resistor is not necessary if EN is driven from a logic input.
･PWM Dimming Ratio
The brightness of the LED string can be reduced by adjusting the PWM duty cycle at the EN pin as follows:
Dimming ratio = PWM on-time / PWM period.
For example, by selecting a PWM period of 5 ms (200 Hz PWM frequency) and a PWM on-time of 50 μs, a dimming ratio of
1% can be achieved. In an actual application, the minimum dimming ratio is determined by various system parameters,
including: VIN , VOUT , inductance, LED current, switching frequency, and PWM frequency. As a general guideline, the
minimum PWM on-time should be kept at 50 μs or longer. A shorter PWM on-time is acceptable under more favorable
operating conditions.
8.3 Range of Output Voltage
fig9 provides simplified equations for approximating output voltage. Essentially, the output voltage of a buck converter is
approximately given as
VOUT = VIN × D – VD1 × (1 – D ) ≈ VIN × D, if VD1<< VIN ･･･(5)
D = tON / (tON + tOFF ) ･･･(6)
where D is the duty cycle, and VD1 is the forward drop of the Schottky diode D1 (typically under 0.5 V).
Copy Right: SANKEN ELECTRIC CO., LTD.
･During SW on-time:
iRIPPLE = [(VIN – VOUT) / L] × tON ･･･(7)
= [(VIN – VOUT) / L] × T × D
where, D = tON / T ･･･(7)
･During SW off-time:
iRIPPLE = [(VOUT – VD1) / L] × tOFF ･･･(8)
= [(VOUT – VD1) / L] × T × (1 – D)
Therefore (simplified equation for Output Voltage):
VOUT = VIN × D – VD1 × (1 – D) ･･･(9)
If VD1 << VOUT,
then VOUT is ･･･ VOUT ≈ VIN × D.･･･(10)
More precisely ･･･
VOUT = (VIN – Iav × RDS(on) ) × D
– VD × (1 – D) – RL × Iav ･･･(11)
where, RL is the resistance fo the inductor.
fig.9 Simplified buck controller equations
Page.11
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