MP1015 ETC1 [List of Unclassifed Manufacturers], MP1015 Datasheet - Page 4

• Manufacturer Part Number: MP1015
• Description: Full System Precision CCFL Driver
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

Figure 2: Functional Block Diagram
Feature Description
Brightness Control
The MP1015 can operate in three modes: Analog
Mode, Burst Mode with a DC input, or Burst Mode
with an external PWM.
dependent on the pin connections as per Table 1.
Choosing the required burst repetition frequency
can be achieved by an RC combination, as defined
in component selection. The MP1015 has a soft on
and soft off feature to reduce noise, when using
burst mode dimming.
Table 2: Function Mode
Brightness Polarity:
Burst: 100% duty cycle is at 1.8V
Analog: 1.9V is maximum brightness
MP1015 Rev 2.7_03/25/03
Monolithic Power Systems
Function
Analog Mode
Burst Mode with
DC input voltage
Burst Mode from
external source
ISFB
VLFB
Comp
Batt
ABrt
IL
1.2V
+
+
-
-
0 – 1.9V
Pin 1
ABrt
V
V
Ref
Ref
Ref 5V
Pin Connection
The three modes are
75mV
+
-
Regulators
0 – 1.8V
2.5V
Internal
PWM
Pin 4
DBrt
V
+
-
Ref
Bosc
DBrt
FT
En
Drv 6V
Ref 5V
Rbosc
Cbosc
www.monolithicpower.com
AGnd
Bosc
Pin 3
1.5V
R
S
S
R
+
-
Q
Q
Q
Q
Control
Logic
TSD
&
Fault Protection
Open Lamp: The VLFB pin (#18) is used to detect
whether an open lamp condition has occurred.
During normal operation the VLFB pin is typically at
5V DC with an AC swing of +/- 2V. If an open lamp
condition exists then the AC voltage on the VLFB
line will swing below zero volts. When that occurs,
the IC regulates the VLFB voltage to 10V p-p and a
1µA current source will inject into the FT pin. If the
voltage at the FT pin exceeds 1.2V, then the chip
will shut down.
Excessive Secondary Current (Shorted Lamp and
UL safety specs): The ISFB pin (#19) is used to
detect whether excessive secondary current has
occurred. During normal operation the ISFB voltage
is a 1V p-p AC signal centered at zero volts D.C. If
a fault condition occurs that increases the
secondary current, then the voltage at ISFB will be
greater than 1.2V. When that occurs, the IC
regulates the ISFB voltage to 2.4V p-p and a 120µA
current source will inject into the FT pin. If the
voltage at the FT pin exceeds 1.2V, then the chip
will shut down.
O
MUX
Precision CCFL Driver
+
-
O
OutL
OutR
Full System
MP1015
T
Q
Q
4