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PDF LD7850 Data sheet ( Hoja de datos )

Número de pieza LD7850
Descripción High Voltage Step-Down White LED Driver
Fabricantes Leadtrend 
Logotipo Leadtrend Logotipo



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No Preview Available ! LD7850 Hoja de datos, Descripción, Manual

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

1 page




LD7850 pdf
LD7850
Electrical Characteristics
(TA = +25oC unless otherwise stated, VCC=30V, EN=5V, 4LED, ILED=350mA)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Power
Operating Voltage VCC
12 70 V
UVLO (ON)
8.5 9.5 10.5 V
UVLO (OFF)
8.0 9.0 10
V
Suspend Current
EN=0, VCC=30V
820 1500
μA
Quiescent Current, IQ
VDD Internal Voltage Regulator
FB=1.0V, EN>4V
1.5 2.0 mA
6.7 7.1 7.5
V
FB
Reference Voltage
400 mV
Reference Voltage Tolerance
(Note 1)
-3.0 3.0 %
Hysteresis Window
±56 mV
Gate/Phase
Driver Capacity
VDD=7.1V, Output High (P-side)
VDD=7.1V, Output Low (N-side)
10 20
10 20
Ω
Ω
Low Side Driver Resistance
50 Ω
EN
Enable
1.3 V
EN Voltage Threshold
Disable
0.7 V
Full Lighting Mode
3.5 4.0
V
Impedance to GND
EN Pin to GND
500 kΩ
Over current trip point
VCC-VPHASE
VCC=10V
0.8 1.0 1.2
Note 1: It is case sensitivity, especially in higher voltage input combined with lower output LED current case.
V
Leadtrend Technology Corporation
LD7850-DS-00a March 2010
5
www.leadtrend.com.tw

5 Page





LD7850 arduino
LD7850
Fig.11 Recommended PCB Layout
BOM list (VCCMAX=70V, ILED=330mA, 6-WLEDs)
REF
Value
PART NO.
LD7850
C1 22μF/100V
C2(Option)
0.1μF/X5R/16V
C3 1μF/X5R/16V
CBOOT
47nF/X7R/25V
D1
100V/1A
SBM110PT
D2
80V/250mA
MMBD4448BPT
L
220μH/0.8A
GDO0804-221M
RCS 1.2
N-MOS
100V/3.2A
AP9997GK
Package
MSOP-10
0603
0603
0603
SMB
SOD-123
0804
0805
SOT-223
Vendor
Leadtrend
Rubycon
CHENMKO
CHENMKO
GOTREND
APEC
Leadtrend Technology Corporation
LD7850-DS-00a March 2010
11
www.leadtrend.com.tw

11 Page







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