IRPLDIM1E Datasheet IRPLDIM1E, IRPLDIM1U | P7-P9

7www.irf.com

Figure 2: IR21592 State Diagram

PREHEAT Mode

1/2-BridgeOscillator On

V

CSPK

+V

IPH

(Peak Current Control)

CPH Charging@I

PH

+1µA

DIM+Open Circuit

Over-Current Disabled

UVLO Mode

1/2-Bridge Off

IQCC=200mA

CPH=0V

Oscillator Off

FAULT Mode

Fault Latch Set

1/2-Bridge Off

I

QCC

=240

µ

A

CPH=0V

VCC=15.6V

Oscillator Off

DIM Mode

Phase

CS

=Phase

REF

DIM=CPH

Over-Current Enabled

CPH > 5.1V

(End of PREHEAT Mode)

VCC < 10.9V

(VCC Fault or Power Down)

or

VDC < 3.0V

(dc Bus/ac Line Fault or Power Down)

or

SD > 2.0V

(Lamp Fault or Lamp Removal)

SD > 2.0V

(Lamp Removal)

or

VCC < 10.9V

(Power Turned Off)

CS > V

CSTH

(1.6V)

(Failure to Strike Lamp

or Hard Switching)

or

T

J

> 165C

(Over-Temperature)

T

J

> 165C

(Over-Temperature)

CS > V

CSTH

(1.6V)

(Over-Current or Hard Switching)

or

T

J

> 165C

(Over-Temperature)

V

CS

>V

IPH

(enable ignition detection)

then

V

CS

<V

IPH

(ignition detected)

VCC > 12.5V

(UV+)

and

VDC > 5.1V

(Bus OK)

and

SD < 1.7V

(Lamp OK)

and

T

J

< 165C

(T

jmax

)

Power Turned On

IGNITION Mode

f

PH

ramps to fMIN

CPH Charging@I

PH

+1µA

DIM=Open Circuit

Over-Current Enabled

8 www.irf.com

Dimming Ballast Design

Lamp Requirements

Before selecting component values for the

ballast output stage and the programmable

inputs of the IR21592, the following lamp require-

ments must first be defined:

Table I, Typical lamp requirements

Ballast Output Stage

The components comprising the output stage

are selected using a set of equations. Different

ballast operating frequencies and their respec-

tive voltages and currents are calculated. The

inductor and capacitor values are obtained us-

ing equations (2) through (7). The results of

these equations reveal the location of each

operating frequency and the corresponding volt-

ages and currents. For a given L, C, DC bus

voltage, and pre-heat current, the resulting volt-

age over the lamp during pre-heat is given as:

ππ

DC

ph

DC

ph

V

I

C

L

V

V −+













=

2

8

[Vpp] (2)

The resulting operating frequency during pre-

heat is given as:

ph

CV

I

f

π

2

=

[Hz] (3)

The resulting operating frequency during igni-

tion is given as:

LC

V

f

ign

DC

ign

π

4

1

2

1

+

=

[Hz] (4)

The total load current during ignition is given

as:

IfCV

ign ign ign

= 2

π

[App] (5)

The operating frequency [Hz] at maximum lamp

power is given as:

(6)

The cathode heating current at minimum lamp

power is given as:

2

%1%1

%1

CfV

I

Cath

π

=

(7)

Design Constraints

The inductor and capacitor values should be

iterated until the following design constraints

have been fulfilled (Table II).

Table II, Ballast design constraints

22

2

%100

2

4

%100

2

%100

4

%100

2

%100

4

1

4

32

1

32

1

2

1

CL

V

VC

P

LC

VC

P

LC

f

DC













−













−+−=

π

Variable Description Units

ph

I

Filament pre-heat current Arms

ph

t

Filament pre-heat time s

max

ph

V

Maximum lamp pre-heat voltage Vpp

ign

V

Lamp ignition voltage Vpp

%100

P

Lamp power at 100% brightness W

%100

V

Lamp voltage at 100% brightness Vpp

%1

P

Lamp power at 1% brightness W

%1

V

Lamp voltage at 1% brightness Vpp

min

Cath

I

Minimum cathode heating current Arms

Design Constraint Reason

VV

ph ph

<

max

Ignition during pre-heat

ff kHz

ph ign

−>5

Production tolerances

II

ign ign

<

max

Inductor saturation

min%1

CathCath

II ≥

Lamp extinguishing during

dimming

9www.irf.com

IR2159 Programmable Inputs

In order to program the MIN and MAX settings

of the dimming interface, the phase of the out-

put stage current at minimum and maximum

lamp power must be calculated. This is obtained

using the following equations:

22

2

%

2

4

%

2

%

4

%

2

%

4

1

4

32

1

32

1

2

1

CL

V

VC

P

LC

VC

P

LC

f

DC













−













−+−=

π

(8)

]42)

2

[(tan

180

3

%

32

%

2

%

2

%

2

%

1

%

fLC

P

V

fL

V

P

C

P

V

ππ

π

ϕ

−−=

−

(9

)

With the lamp requirements defined, the L and

C of the ballast output stage selected, and the

minimum and maximum phase calculated, the

component values for setting the programmable

inputs of the IR21592 are obtained with the fol-

lowing equations:

This ballast design procedure has been sum-

marized into the following 3 steps:

Figure 3, Simplified Ballast Design Procedure

Ballast Designer Software

Included with the design kit is the Ballast Designer

Software which allows for selection of different

lamp types, different input voltage ranges or dif-

ferent lamp configurations. The software then

performes all of the necessary design iterations

and generates new schematics and a bill of ma-

terials.

IRPLDIM1U Design

Line Input Voltage: 90 to 140VAC/50/60Hz

Lamp Power/Type: 32W/T8

1) Lamp Requirements

Typical high-frequency (25kHz) lamp require-

ments for the 32W/T8 lamp type are given as:

Table III, 32W/T8 lamp requirements

)142()10000(

)101()10000()625(

−⋅−

−⋅−−−

=

ef

efe

R

MIN

FMIN

[Ohms]

(10)

ign

CS

I

R

)6.1(2⋅

=

[Ohms]

(11)

2

phCSFMINIPH

IRRR

=

[Ohms]

(12)

))(72(

PHCPH

tEC −=

[Farads]

(13)













−=

45

1

4

%1

ϕ

FMIN

MIN

R

[Ohms]

(14)

Define

Lamp

Requirements

Iterate L and C

to fulfill

constraints

Calculate IR2159

Programmable

Inputs

Variable Value Units

ph

I

0.6 Arms

ph

t

1.0 s

max

ph

V

600 Vpp

ign

V

1300 Vpp

max

P

30 W

max

P

V

400 Vpp

min

P

1 W

min

P

V

330 Vpp

min

Cath

I

0.35 Arms

[Ohms] (15)

−⋅

=

4

F

M

MIN

FM I

N

MAX

RR

R

IRPLDIM1E

IRPLDIM1E

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