ZLED7015ZI1R ZMDI, ZLED7015ZI1R Datasheet - Page 14

• Manufacturer Part Number: ZLED7015ZI1R
• Description: LED Lighting Drivers LED driver
• Manufacturer: ZMDI

Specifications of ZLED7015ZI1R

• Rohs: yes
• Input Voltage: 6 V to 30 V
• Maximum Supply Current: 2 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MSOP-10
• Minimum Operating Temperature: - 40 C

The output current controlled by the DC voltage on FB can be calculated using equation (2):
Where
2.2.3
An external pulse-width modulated (PWM) signal input can be used to control the LED output current by
driving the output current to a value below the nominal average value defined in section 2.2.1. A
microcontroller can be used to generate the PWM signal. See Figure 2.3 for an example circuit. The PWM
signal is superimposed on the feedback voltage from R
produces a DC voltage with a ripple. This method of controlling dimming is similar to the external DC voltage
control described in section 2.2.2. The duty cycle of the PWM signal regulates the filtered DC voltage level,
which inversely controls the LED output current level. When the duty cycle is at 100%, the output current is at
the minimum. With a 0% duty cycle, the output current is at the maximum.
Recommendation: With a PWM signal of 0 to 5V, use an R
minimize the filtered PWM voltage ripple.
Note: It is important to ensure that the LED output voltage V
dimming applications.
Figure 2.3
Data Sheet
December 20, 2011
ZLED7015
1.0MHz Boost Converter with Internal 35V Switch
I
V
V
OUT
FB
DC
= Internal feedback reference voltage (Table 1.3, parameter 1.3.7)
= External DC control voltage
= Output current through the LED(s) with a DC control voltage
Dimming via PWM Control
I
OUT
V
Example Circuit for Controlling Output Current via a PWM Control Signal
IN
C
= 6 to 30 VDC

IN
© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
Microcontroller PMW Signal
V
C
FB
1


 

C
R
R
VDD
VDD
3

R

V
S
R
R
DC
EN
4
EN
VDD
ZLED7015

PGND
V
FB

L

 

1
AGND
OVP
VP
FB
LX
5V
0V
S
D
at the FB pin via the input filter R
C
1
3
R
R
VP
value of 10kΩ and a PWM frequency of >2kHz to
1
2
OUT
remains higher than the input voltage V
C
OVP
R
R
4
5
R
3
C
C
2
3
C
String
OUT
LED
R
S
5
/C
3
and R
14 of 22
4
, which
(2)
IN
in