DC / DC converter for LCDs
BP5319 / BP5319X
The BP5319 and BP5319X are DC / DC converters for supplying power to liquid crystal displays (LCDs) panels. These modules supply a negative voltage from power supply of 5V. They are available in a single in-line package as an upright (BP5319) or L-shaped lead (BP5319X) type.
Applications LCD panels in copiers, facsimiles, personal computers, word processors, instruments, and other displays
Features 1) Accurate output voltage. (−24V±0.75V) 2) High conversion efficiency. (typically 75%) 3) The external resistor can change an output voltage. 4) Built-in protection circuit. 5) Built-in ON/OFF switch. 6) Compact and light. 7) Available as an upright or L-shaped lead type.
Absolute maximum ratings (Ta=25°C)
Parameter Input voltage Output current ON / OFF CTL voltage Operating temperature range Storage temperature range Symbol VIN Io VCTL Topr Tstg Limits 7 30 7 −10~+60 −30~+85 Unit V mA V °C °C
1/5
BP5319 / BP5319X
Pin descriptions
Pin No. 1 2 3 4, 7 8 9 Pin name CO VOUT Vref GND VCTL VIN Function Output smoothing capacitor connection pin; connect a low-impedance capacitor with a recommended capacitance of 47 µ F between this pin and GND. Output pin Output voltage adjustment pin for contrast; output voltages is adjusted by connecting a resistor between pins 2 and 3 or pins 3 and 4. Ground pin; pins 4 and 7 are internal connection. Output ON / OFF control pin; output starts when the pin is LOW level or OPEN, and stops when the pin HIGH level. Input pin; connect a low-impedance capacitor with a recommended capacitance of 100mF between this pin and GND.
Electrical characteristics
Parameter
(Unless otherwise noted, Ta=25°C)
Symbol
Min.
Typ.
Max.
Unit V
Conditions
Input voltage Output current Output voltage Line regulation Load regulation Output voltage temperature coefficient Ripple noise voltage Conversion efficiency ON / OFF CTL voltage when OFF ON / OFF CTL voltage when ON
VIN IOUT VOUT ∆V1 ∆V2 ∆Vt ν1 η VCTL VCTL
4.5 − −24.75 − − − − 70 2.0 − − − 50 50
− − −24.00 − − −10 − 75 − −
5.5 30 −23.25 0.24 0.24 − 150 − − 0.5
mA V V V
VIN=5V, IOUT=25mA VIN=4.5~5.5V, IOUT=25mA VIN=5V, IOUT=0~25mA ∗2 ∗1
mV / °C VIN=5V, IOUT=25mA mVPP % V V µA mA kΩ kΩ
VIN=5V, IOUT=25mA VIN=5V, IOUT=25mA VIN=5V VIN=5V
(Alternatively, when Open) ON / OFF CTL input current Current consumption when OFF R1 resistance R2 resistance
∗1 Measured with a bandwidth of 20MHz. ∗2 Ta=−10~60°C
ICTL IOFF R1 R2
100 − − −
150 0.5
VIN=4.5~5.5V, VCTL=5V ∗2 VIN=4.5~5.5V, VCTL=5V ∗2 VIN=4.5~5.5V, VCTL=5V ∗2 VIN=4.5~5.5V, VCTL=5V ∗2
∞ ∞
2/5
BP5319 / BP5319X
Measurement circuit
BP5319 / BP5319X
1
2
3
4
7
8
9
VIN VOUT ON / OFF SW
C2
C3
+
C1 VCTL
+
GND
GND
Fig.1
C1 : 100µF / 16V (Low-impedance capacitor) C2 : 47µF / 35V (Low-impedance capacitor) C3 : 0.022µF / 50V (Ceramic capacitor)
Application example
(1) When increasing the output voltage (to negative voltage side) (2) When reducing the output voltage (near to zero voltage)
BP5319 / BP5319X
BP5319 / BP5319X
1
2 R1
3
4
7
8
9
Be sure to use fuse for safety
1
2
3 R2
4
7
8
9
Be sure to use fuse for safety
VOUT C2 GND ON / OFF
+
C1
VIN
VOUT C2 ON / OFF
+
C1
VIN
+
GND
GND
+
GND
Note) Set up the change of the output voltage in the range of the territory(Fig.2) which can be used.
Operation notes (1) Place I/O external capacitors as near as possible to the connection pins. In particular, make sure to minimize the impedance between the input-side capacitor (C1) and pin 9. (Reference value: A length less than 50mm is recommended for a copper foil of 1.0mm wide and 35µm thick.) (2) Avoid frequent switching using the ON / OFF CTL pin (5 times per second at the maximum).
3/5
BP5319 / BP5319X
Electrical characteristic curves
−30 OUTPUT VOLTAGE : VO (V) −25 −20 −15 −10 −5 Unusable range Ta=60°C
VIN
OUTPUT VOLTAGE : VO (V)
OUTPUT VOLTAGE : VO (V)
=5
V
∗1. R1>50kΩ R1 2pin − 3pin R2
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