LD7850GSE 반도체 회로 부품 판매점
High Voltage Step-Down White LED Driver
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 Leadtrend |
LD7850
3/18/2010
High Voltage Step-Down White LED Driver
REV: 00a
General Description
The LD7850 is a step-down DC/DC converter, especially
designed to drive power white LEDs with constant current.
With capability to transfer output voltage up to 60V, the
LD7850 can drive a string of up to 15 series-connected
power white LEDs and ensure uniform brightness. To
optimize the efficiency, the feedback voltage is set to 0.4V.
This reduces the power dispassion on the current sense
resistor. The other features include under-voltage lockout,
over-current protection and dimming function essential for
the white LED applications.
LD7850 is available in a space saving MSOP-10 and
SOP-8 package.
Features
‧ Input Voltage Range: 12V to 70V
‧ Hysteresis Mode Control
‧ Drive one string of LEDs, VO up to 60V
‧ No need output capacitor
‧ Analog Dimming Control
‧ Over Current Protection
‧ Suspend current < 1.5mA
Applications
‧ Electronic Appliances
‧ Automotive LED Driver Application
‧ Bracket Lamp and Wall Lamp Application
+patent pending
Typical Application
Fig. 1 Application circuit
Leadtrend Technology Corporation
LD7850-DS-00a March 2010
1
www.leadtrend.com.tw
Pin Configuration
SOP-8 (EP) (TOP VIEW ) MSOP-10 (TOP VIEW)
LD7850
3/18/2010
8765
TOP MARK
YYWWPP
1234
10 9 8 7 6
TOP MARK
YYWWPP
1234 5
YY: Year code
WW: Week code
PP: Production code
Ordering Information
Part number
Package
LD7850 GSE SOP-8 (EP) Green Package
LD7850 GL
MSOP-10
Green Package
Note: The LD7850 is ROHS compliant.
TOP MARK
LD7850GSE
7850GL
Shipping
2500 /tape & reel
2500 /tape & reel
Pin Descriptions
SOP-8 (EP)
PIN NAME
1 BOOT
2 VCC
3 EN
4 VDD
5 FB
6 GND
7 PHASE
8 GATE
FUNCTION
This pin provides ground referenced bias voltage to the high-side
MOSFET driver. Connect this pin to a bootstrap circuit to pump boot
voltage to drive an N-MOS.
Supply Voltage Input. VCC supplies power to Step-down converter.
Bypass this pin to GND with a ceramic capacitor of at least 10μF.
This pin provides both Enable and Dimming functions.
Enable Function. High=enable, Low=Disable.
Dimming can be accomplished by applying analog signal to EN pin.
If EN pin floats, a fault protection detector will disable the chip.
Internal Regulator Output Voltage. Bypass this pin to GND with a 1μF
ceramic capacitor. This pin provides the bias for the control circuitry and
the high-side N-MOS driver.
Feedback Pin. Connect a resistor from FB to ground to set the LED
current.
IC GND.
Inductor switching node. Connect to Inductor and bootstrap flying
capacitor.
Gate drive output to drive the high-side N-MOS.
Leadtrend Technology Corporation
LD7850-DS-00a March 2010
2
www.leadtrend.com.tw
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LD7850GSE led
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