IMP38C/HC/42/3/4/5
Electrical Characteristics
Unless otherwise noted, VCC = 15V, RT = 10kΩ and CT = 3.3nF. Specifications are over the – 40°C to +85°C ambient temperature range.
Bold/blue specifications indicate enhanced performance features.
Parameter
Symbol Conditions
Min
Typ
Max Units
Current Sense
Gain
AVOL
Notes 1, 2 and 3
2.90
3.00
0.98
70
3.10
V/V
V
Over Current Protection Threshold
Power Supply Rejection Ratio
Input Bias Current
Delay to Output
Output
Vcomp = max, Note 2
VSTART ≤ VCC ≤ 18V
0.9
1.1
PSRR
IB
dB
µA
ns
–0.1
50
–2.0
TPD
VFB = 0V, ISNS 0V to 2V, CL = 1nF
65
IMP38C4x
ON Resistance, High
ON Resistance, Low
RDS (ON)
ISOURCE = 0.2A
ISINK = 0.2A
20
11
Ω
IMP38HC4x
ON Resistance, High
ON Resistance, Low
RDS (ON)
ISOURCE = 0.2A
ISINK = 0.2A
10
5.5
Ω
Peak Drive Current
HC devices
H devices
1.0
0.5
A
IMP38C4x Rise Time
IMP38C4x Fall Time
IMP38HC4x Rise Time
IMP38HC4x Fall Time
Shoot-through Current
Undervoltage Lockout
Start Threshold
TR
TF
TR
TF
TA = 25°C, CL = 1nF
TA = 25°C, CL = 1nF
TA = 25°C, CL = 1nF
TA = 25°C, CL = 1nF
40
30
20
15
0
70
50
50
40
ns
ns
ns
ns
mA
IMP38C42/4, IMP38HC42/4
IMP38C43/5, IMP38HC43/5
13.5
7.8
14.5
8.4
15.5
9.0
V
V
Minimum Operating Voltage
IMP38C42/4, IMP38HC42/4
IMP38C43/5, IMP38HC43/5
8
7.0
9
7.6
10
8.2
Pulse Width Modulator
Maximum Duty Cycle
Maximum Duty Cycle
Minimum Duty Cycle
Supply Current
IMP38C42/3, IMP38HC42/3,
94
96
%
%
%
IMP38C44/5, IMP38HC44/5
48
50
0
Start-Up Current
VCC = 13V for IMP38C42/44, IMP38HC42/44
VCC = 7.5V for IMP38C43/45, IMP38HC43/45
95
120
1.5
µA
Operating Current
ICC
VFB = VIS = 0
0.5
mA
Note 1. Guaranteed by design. Not 100% tested in production.
Note 2. Measured at trip point of VFB = 0V.
Note 3. Gain is defined as:
Note 4. Adjust VCC above the start threshold before setting at 15V.
Note 5. Output frequency equals the oscillator frequency for
IMP38C42/3 and IMP38HC42/3 devices. Output frequency
equals one-half the oscillator frequency for IMP38C44/5 and
IMP38HC44/5 devices.
∆V
A =
COMP ,0 ≤ VCS ≤ 0.8V
∆V
CS
Table 1. Startup and Operating Voltage Selection Guide
UVLO Thresholds
Start-up at 8.4V
Operating Minimum = 7.6V
Start-up at 14.5V
Duty Cycle
0% to 96%
0% to 50%
Operating Minimum = 9.0V
IMP38C43/HC43
IMP38C42/HC42
IMP38C45/HC45
IMP38C44/HC44
38C/HC_t03.eps
© 2000 IMP, Inc.
PWM Controllers
5
IMP [ IMP, INC ]
