NE5565 Datasheet, PDF (1/6 Pages) NXP Semiconductors – Electronic ballast controller circuit

Philips Semiconductors
Electronic ballast controller circuit
Product specification
NE5565
DESCRIPTION
The Electronic Ballast controller chip has been designed in a bipolar
process. It is housed in a 20-lead dual-in-line plastic package. The
control chip contains the equivalent of two (2) switched mode power
supply control circuits. The first SMPS controller is a DC-to-DC
converter operating in the discontinuous current conduction mode.
It is used as a PFC in the ballast system to provide a DC voltage
step-up function, good AC power factor, low AC current harmonic
distortion, and circuit protection against some types of AC voltage
transients. The PFC uses pulse width modulation to control the
power transfer with an external MOS power transistor. The second
SMPS circuit is a half-bridge oscillator circuit. It converts the DC
output voltage of the PFC into a high frequency AC voltage for
operating lamps. Power transfer in this circuit is controlled by
changing the switch frequency. The half-bridge controller circuit is
capable of driving two external high voltage MOS power transistors
and it has circuits to regulate the lamp current, limit the peak lamp
voltage, and protect the power switches during fault conditions. This
electronic ballast controller circuit has the capability of being used in
a dimming application.
FEATURES:
• Complete PFC correction and dimming ballast control on one IC
• Low line current distortion PFC
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Dual-In-Line Package (DIP)
PIN CONFIGURATION
N Package
C_T ¹
C_P ²
D_MAX 3
R_T ⁴
RXCX 5
V_LAMP ⁶
C_RECT 7
LI2 8
LI 9
CSI ¹⁰
20 DC_OUT
19 DC
18 OV
17 PF
16 V_REF
15 I_PRIM
14 _OUTH
13 V_CC
12 OUT_P
11 GND
Figure 1. Pin Configuration
SL00524
• Selectable variable frequency modes
• Programmable pre-hit and ignition
• Lamp over-voltage protection
• PFC over-voltage protection for preventing over-shooting due to
load removal
TEMPERATURE RANGE
0 to +85°C
ORDER CODE
NE5565N
DWG #
SOT146-1
BLOCK DIAGRAM
1996 May 21
C_{RECT 7}
LI2 8
LI 9
CSI 10
GND 11
OUT_P 12
V_CC 13
V_LAMP
6
RXCX
R_T
54
V_CC
3 D_MAX
2 C_P
1 C_T
14
15
16 17 18
19
OUT_H I_PRIM
V_REF PF OV
DC
Figure 2. Block Diagram
1
20 DC_OUT
SL00525
853-1835 16843